61. ASTR 1120-001 General Astronomy: Stars & Galaxies Quiz #1Prep Questions (Preston ASTR 1120001 General Astronomy stars galaxies Quiz 1Prep Questions (Preston). Whydon't most constellations change in appearance over years? http://aps.colorado.edu/~prestonh/astr1120/quizzes/astr1120_qz1prep_answers.html

ASTR 1120-001 Quiz #1Prep Questions (Preston) This first quiz will be entirely multiple choice questions, and only 20 of them. As with all multi-choice questions, you will need to evaluate which answers are possible and DO THE EASIEST ONES FIRST. That way you don’t wind up losing points on questions you could have answered because you were working on a long calculation instead. This does have one drawback, and that is that you can forget to go back to questions you skipped. Therefore, rule #2: CHECK YOUR ANSWER SHEET TO MAKE SURE ALL 20 QUESTIONS HAVE BEEN ANSWERED. Sometimes if you can only eliminate one or two wrong answers to a question, that improves your chances when guessing which of the other three answers is correct! Worth a try. Lastly, if you do not understand something because of the way the question is phrased, RAISE YOUR HAND. 1. Stellar Parallax what it is, what it depends on. So far, we discussed this in the planetarium on Tuesday, and a little bit on Thursday, although it was in your Chapter 2 reading assignment (p.62 and look at the figure!). Why don't most constellations change in appearance over years?

62. NHC Astronomy Links Beta Pictoris Swarm of stars in Large Magellanic Cloud (LMC) constellations fromPeoria Astronomical Society constellations and their stars Pulsars galaxies http://www.northharriscollege.com/departments/nsci/physics/astro.html

NHC Natural Sciences Physics HomePage Current Moon Phase from U.S. Naval Observatory Background Credit: AURA/NOAO/NSF Public Centers Astronomy News Space Exploration ... North Houston Astronomy Liftoff J-Tracking Spacecraft Texas Star Party UT McDonald Observatory Sun: Sunspots Live from the Sun Solar Max 2000 Solar Physics ... SpaceWeather.com Earth Viewings: Astronomy of Earth' s Motion in Space SeaWiFS Project Global Hydrology and Climate Center Welcome tho the Aurora Page ... Study of the Polar Regions Earths moon: Digital Atlas of Moon Eclipses During 2001 Newtons' Mechanics Virtual Reality Moon Phase Pictures ... Sky and Telescopes Occultation Page Planets: Kepler and His Laws Kepler's Laws The Planets -Peoria Astronomical Society Mystic Mars ... Planets and the Solar System Asteroids, Meteorites, Comets: Discovery is NEAR Asteroid Radar Research Asteroids and Comet Impact Hazards Comet Links ... Meteorite Photo Gallery Stars: The Birth of Stars Stars and Introduction Stellar Evolution and Death Stellar Properties ... Pulsars Galaxies: Galaxy Information The Annotated Galactic Center (Milkyway) Types of Galaxies Series of Articles on Galaxies ... Galaxies and Quasars Nebulae: Types of Nebula NOAO Image Gallery Close-up View of Reflection Nebula in Orion Molecular Cloud Barnard 68- dark absorption nebulae ... Gallery of Planetary Nebulae Supernova: Titanic Collision Lights Up Supernova Ring Introduction to Supernova Remnants 1054 Supernova Petrograph "And Then It Just Blew Up" ... Supernova Black Holes: X-ray Binaries and Black Holes Lone Black Holes Discovered Adrift in the Galaxy Accretion Disk Binary System Black Holes and Neutron Stars ... Astronomy Picture of the Day -Quasars Evolution of the Universe:

63. Stars And Galaxies Students will learn about the appearance, classification, position,and size of various stars, constellations and galaxies. Language http://www.learnsol.com/sun/lessons/chapter8/ch8lesson2.html

8th Grade Database Lesson Stars and Galaxies Lesson Goal: The goal is to have students understand the structure and composition of the universe by studying the stars and galaxies and their evolution through time. Students will explore the physical characteristics of different stars and galaxies. Using a variety of print and Internet sources, students will research different stars and galaxies and create a database with information to identify similarities and patterns. Students will use StarBase, StarOffice's database application, to create a database and produce reports to analyze the gathered information. Time Required: Fifty five-minute periods over 8 days Rationale: This lesson is designed to addresses Science and Language Arts standards for the 8th grade. Earth Science standard 4 requires students understand the properties and characteristics of stars and galaxies. This standard requires students understand how stars are born and how they evolve over time. Students will learn about the appearance, classification, position, and size of various stars, constellations and galaxies. Language Arts writing standard 2.3 requires students write research reports that record important ideas from significant information sources. Standard 1.4 for Research and Technology states students must plan and conduct multi-step information searches using computer networks and modem-delivered services. Student Academic Outcome Objectives: Students will be able to gather data about stars and galaxies from print and Internet sources.

64. SCIENCE ANDRE DE HON RESEARCH plus stars galaxies AT NASA INDEX plus starsAND STAR FORMATION plus stars,constellations NEBULAE FACTS. http://www.funworld.be/science.htm

SCIENCE REPORT YOUR HOMEPAGE-WEBSITE TO clubbers@funworld.be HOME DEEP IMPACT THE FIRST LOOK INSIDE A COMET plus SCI/TECH AT GOOGLE NEWS SEARCH FOR SCIENTIFIC INFORMATION IN SCIRUS SEARCH SCIENTIFIC AMERICAN plus AAAS plus SPACE DOT COM plus DIRECTORY OF COMPUTER SCIENCE RESOURCES plus DIRECTORY OF COMPUTING SCIENCE JOURNALS THINK QUEST SCIENCE EXPLORER plus MARS IMAGES MALIN SPACE SCIENCE SYSTEMS NATURE plus SCIENCE IN VIRTUAL LIBRARY plus SCIENCE FAIRS IN VIRTUAL LIBRARY EXTREME SCIENCE plus SOPHIA ANTIPOLIS SCIENCE PARK THE ALIVISATOS GROUP UNIVERSITY OF CALIFORNIA.BERKELEY ... SCIENCE plus SCIENCE IN YAHOO DIRECTORY NANOSCIENCE AT IBM RESEARCH plus VIRTUAL SCIENCE COURSES ON THE WEB FORESIGHT INSTITUTE NANOTECHNOLOGY plus SCIENCE MAGAZINE NEW SCIENTIST plus SCIENCE IN OPEN DIRECTORY plus THE FORMATION OF STARS AND PLANETS SCINET SCIENCE SEARCH DIRECTORY plus WHAT'S UP IN THE SKY?

65. Books About Stars Describes the features of the Sun and other stars which make up the galaxies. Excellentintroduction to exploding stars and Supernova. constellations. http://umainesky.com/tg/tgreso6.htm

Stars Stars Constellations Stars 100 Billion Suns: The Birth, Life, and Death of the Stars Kippenhahn, R. 1983, Basic Books. Nontechnical review of stellar evolution. Astronomers' Stars Moore, P. 1987, Norton. Profiles of individual stars whose understanding was crucial to the progress of astronomy. The Birth and Death of Stars Asimov, Isaac. 1989, Gareth Stevens Children's Books. Considers how stars come into being, change and grow older, and eventually come to an end. Black Holes and Warped Spacetime Kaufmann, W. 1979, Freeman. Best introduction to black holes and the theories behind them. Bright Stars, Red Giants, and White Dwarfs Berger, M. 1983, Putnam. Brief introduction to stars and their evolution for ages 10 - 15. Discover the Stars Berry, R. 1987, Harmony, Crown. A fine introduction by the editor of Astronomy magazine, with clear maps. A Field Guide to the Stars and Planets Updated edition of a classic guide, full of information and with good new maps.

66. LINKS The Sky Facts and information about the stars, constellations, galaxies,Comets. stars and constellationsWhat are constellations? http://www.indianchild.com/links_for_solar_system.htm

web hosting provided by Direct i LINKS/SITES FOR SOLAR SYSTEM INFORMATION OR PHOTOS. Astronomy - USEFUL Resource pages . Links for The Solar System The Sun Astronomy Space Missions History of Astronomy ... Observatory Tours and More The Solar syste m -This is one of the most informative sites for solar system information or photos. Solar system Lots of information on solar system, photos, water on mars etc. Views Of The Solar System Images and information about the Sun, planets, moons, asteroids and comets, and the history of space exploration. Welcome to the Planets Another pictorial tour of the solar system from NASA's Jet Propulsion Laboratory. Stars and Galaxies A comprehensive multimedia guide to stars and galaxies, taken from the CD-ROM Earth and Universe Hubble Space Telescope pictures Some spectacular images from the Hubble space telescope, plus some computer animations Messier Catalog Images of the brightest and most beautiful diffuse objects in the sky, including nebulae, galaxies and star clusters The Web Nebulae Information about nebulae, with spectacular images

67. CyberSleuth Kids.com: A K-12 Homework Helper And Directory http //astro.wisc.edu/~dolan/constellations; stars and galaxies This site givesyou an idea of how stars behave, how their energy is generated and something of http://cybersleuth-kids.com/sleuth/Science/Space/Stars_and_Constellations/index1

Home Fun and Games Science Math ... CLIPART A Great Site to find school related clipart. Over 20,000 pictures, illustration, clipart and images to download!! CLIPART INDEX Clipart History Animals, Dinosaurs ... Central Free Lesson Plans in Math, Social Studies, Art, Language Arts, and Science. Rubrics, Worksheets, and Teacher Productivity Tools!! Math Worsheets Math Flash Cards Online Word Search Stay up-to-date! Sign up for our mailing list Subject Themes Dinosaurs Civil War Educational Software US States ... Ancient Civilizations Clipart Mathematics Explorers Inventors ... Lessons US History Search: Home Science Space Stars and Constellations SEARCH RESULTS 13 - 15 of 15 Stars and Constellations Information and pictures of constellations and stars.A list of stars in Bright Star Catalog order.

68. Winter Constellations: Glossary constellations A group of fixed stars viewed together, usually named Galaxy A hugesystem of stars, gas, dust, planets There are millions of galaxies in space. http://members.aol.com/ckckside/reports/constellation/astroe.htm

Winter Constellations GLOSSARY This is a glossary of terms used in my report. This might help you understand some of the terms I use. If you look in the sources you can find books and web sites that will give you a full explanation of the terms. Asterism A group of stars that take on an easily recognized shape or form; a cluster of stars. Astrology The use of astronomical phenomena to predict earthly and human events. This practice is not accepted by Christian scholars and believers. Black Hole The remains of a star after it has exploded. It has a very strong gravitational pull and sucks in every object around it. It even pulls back rays of light and that is why we cannot see a black hole. Constellations A group of fixed stars viewed together, usually named with reference to an imaginary outline enclosing them. A basic asterism plus much more of the surrounding sky and stars. Double Stars Also called binary systems. Consist of two stars that revolve around each other or around a common center of gravity. Galaxy A huge system of stars, gas, dust, planets, and other interstellar matter. The system is held together by gravity and rotates around its own center. There are millions of galaxies in space. A few are visible to see without binoculars or telescopes. One of the most beautiful and best known galaxies is M31, the Andromeda Galaxy.

69. ThinkQuest Library Of Entries Despite that, we still consider the 12 original constellations the zodiac. Backto Top Solar System galaxies stars Universe Astronomers Interact http://library.advanced.org/26220/stars/constellations.html

Welcome to the ThinkQuest Internet Challenge of Entries The web site you have requested, Think Space , is one of over 4000 student created entries in our Library. Before using our Library, please be sure that you have read and agreed to our To learn more about ThinkQuest. You can browse other ThinkQuest Library Entries To proceed to Think Space click here Back to the Previous Page The Site you have Requested ... Think Space click here to view this site A ThinkQuest Internet Challenge 1999 Entry Click image for the Site Languages : Site Desciption ThinkSpace is designed to teach people about space. Using the Internet style of learning we created a web page that would be both informative and fun for the internet user. There are five main sections to the page: Stars, Galaxies, Solar System, Universe, and Astronomers. In each of these main sections we enable the user to expand upon their present knowledge. It is our hope that the users will help our site grow by taking part in the interactive sections of the site. We have included two areas where users may add pictures to a gallery and submit samples of their creative writing as it relates to topics about space. Additionally our chat program will allow the user to discuss and exchange ideas on a global basis. The web site is supplemented by a comprehensive popup glossary, search engine, message board, guestbook, and interactive games. Students Ryan Lakeland High School NY, United States

70. Daily Lessons And Homework Homework Sign up for one of the constellations in the 3)Try to order the stars interms of their life 10 (A)/13(B), galaxies and the expanding universe, Read http://www.asij.ac.jp/middle/ac/sci/8mep/Unit 4/Unit 4.htm

Daily Lessons and Homework - Unit 4 - Stars and Galaxies Back to ESS Homepage Back to ASIJ Homepage Back to Middle School Homepage Please follow these procedures when you submit a written assignment on paper Your name, the date, your class (what day and period it is ex. A2 or B7) and a title which identifies the assignment must be at the top of the work. Please follow these procedures when you submit an assignment by email All of the above details must be included at the top of the message and in the attachment if there is one. Very important - In the subject of the email your name and class must appear. This will let me sort the emails into the proper folders. Marks will be deducted from assignments which do not follow the above procedures. 10% per day late penalty. Unit 4 - Stars and Galaxies General Resources: Common Misconceptions About Astronomical "Stuff" The SETI Institute Star Date Online - Your guide to the universe Imagine the Universe - NASA ... The Electromagnetic Spectrum - A very simple explanation by NASA How do Radio Telescopes work?

71. PRODUCT REVIEWS BY EDUCATION CLEARINGHOUSE finding out more. My nine year old son is absolutely fascinated withthe universe/galaxies/stars/constellations. We bought him a http://www.educationclearinghouse.org/reviews/02-14-04.html

PRODUCT REVIEW Bedroom Astronomy Education Clearing House www.educationclearinghouse.org EDUCATION CLEARINGHOUSE REVIEW CENTER If you have purchased this item, please rate it for us! We will then sign you up for our monthly drawing for a great prize! Email Address: Verify Email : RATE IT! FANTASTIC GOOD FAIR POOR Bedroom Astronomy KIDS TAKE [1-3 STARS] OUR TAKE [1-3 STARS] RATING [1-3 STARS] PURCHASE OR INQUIRE http://www.klutz.com PRICE (USA) $14.95 1 REVIEW Company: Klutz A entire galaxy inside your bedroom! Fall asleep under the stars! Here are some of the things you will find within this book ... An introduction to the universe ... How the universe began [see further details below] How to build a star The way stars gather How to find the constellations in Summer How to find the constellations in Winter Daytime Constellations You are here...actually that is not entirely true What's the speed of true love? Stars come in many colors The amazing shrinking moon Good satellite viewing The teapot Planet with a view Are we alone?

72. Stars And Galaxies In 3D - CNETAsia Includes most visible stars (the constellations are recognizable) and many nearbystars too dim to see with the naked eye. The galaxies span about 325 million http://asia.cnet.com/downloads/pc/swinfo/0,39000587,39018140s,00.htm

CNETAsia IT Manager Builder Product Reviews ... Membership Search All CNETAsia IT Manager Builder Product Reviews Downloads Linux CNETAsia Downloads Windows Science Stars and Galaxies in 3D CNETAsia Members Wireless Watch Web Services Storage outlook ... Shopping Vouchers Stars and Galaxies in 3D Download Now Free download 1.24MB More Downloads Most Popular New releases Downloads: Publisher: Jeff Rogers Software Version: Date added: File size: Approx. download time: Clock Your Download License: Free to try Minimum requirements: Description From the developer: "Displays 9,000 stars and 2,400 galaxies in 3D, including all stars known to have planets. You can easily move and look in any direction. Select stars by distance, magnitude(brightness), or spectral type. Find individual stars by name or constellation, by distance, and stars known to have planets. Visit any star or galaxy with a keypress. View constellations from the Sun and watch them change as you travel around the known parts of our galaxy. Uses OpenGl graphics, like video games. There are presets to get you started. Real, beautiful, and easy to use. Star color is based on spectral type, galaxy color based on relative speed (red-shift). Includes most visible stars (the constellations are recognizable) and many nearby stars too dim to see with the naked eye. The galaxies span about 325 million light years." CNET User Opinions (0 votes) Would you recommend this product?

73. Solar System constellations, Neptune. constellations, Neptune. Sun, Mars. Sun, Mars. Black Holes,Astronauts. Black Holes, stars and galaxies. Black Holes, stars and galaxies. http://schools.4j.lane.edu/~forsman/technology/solarsystem.html

Solar System Rockets and the Inventor of Uranus Women Astronauts Uranus ... Back

74. University Courses - Astronomy include constellations, gravity, radiation, the Sun, structure and evolution ofstars, neutron stars and black holes, the Milky Way galaxy, normal galaxies, http://scs.indiana.edu/univ/univ_courses_subjects/univ_astro.html

Astronomy A100 The Solar System A105 Stars and Galaxies A110 Introduction to Astronomy NOTE: A100, A105, and A110 are introductory astronomy courses of roughly comparable difficulty. No one of them is considered a prerequisite for any other. A110 is designed to be a survey of all modern astronomy in one course. A100 and A105 divide the A110 material into two parts. Taken together, A100 and A105 cover essentially the same material as A110 but in greater depth. Mathematics at the level of high school algebra is assumed in these courses. A100 The Solar System (3 credits) (8 submissions; 2 exams) Celestial sphere, constellations, apparent motions of celestial objects, eclipses, history of astronomy, astronomical observations, the Earth as a planet, the Moon, the planets and their satellites, comets, meteors, theories of the origin of the solar system. Nighttime viewing of sky required. Credit not given for both A100 and A110. The Learning Guide introduction for this course is available in Adobe Acrobat format.

75. Re: QUEST Dot Net (tm) - Astronomy And Space Exploration http//www.astro.wisc.edu/~dolan/constellations/; HandsOn Universe and understandingthe formation of the first stars and galaxies, the evolution of http://www.re-quest.net/science/astronomy/

Astronomy and Space Exploration RQdN Home Science Astronomy AstroPlace A large site full of astronomy information and resources for all age groups. http://www.astroplace.com/ The Nine Planets An overview of each of the nine planets in our solar system and their moons complete with pictures and diagrams. http://hermes.astro.washington.edu/mirrors/nineplanets/ StarGazer Use this sites star map to find constellations in the sky. You can click on a star for detailed information. Great for finding your way through the night sky. http://www.outerbody.com/stargazer/old.html Amateur Astronomy Plenty of link and resources for the amateur astronomer. Also has links to many observatories. http://www.physics.usyd.edu.au/~ptitze/aa/index2.html Astro!nfo News, events, articles, pictures and more. From the Swiss Astronomical Society. http://www.astroinfo.ch/english.html Astronomical Data Center for Amateur Astronomers A data collection that is useful in looking up the properties and locations of celestial objects. From the Astronomical Data Center (ADC). http://adc.gsfc.nasa.gov/adc/adc_amateurs.html

76. Astronomy and their stars, and provides links to sky maps, star myths, and guides for amateurastronomers. http//www.astro.wisc.edu/~dolan/constellations/. galaxies. http://www.trschools.k12.wi.us/TRHS/library/Study/Science/astronomy.htm

Astronomy Picture of the Day Index http://www.sai.msu.su/apod/lib/aptree.html NASA http://www.nasa.gov/ Laboratory for High Energy Atrophysics Links http://lheawww.gsfc.nasa.gov/docs/lhea/HOMEPG/Links.html Goddard Space Flight Center http://space.gsfc.nasa.gov/education.html Access Excellence: Earth/Space Science Links Astronomy, Meteorology, Geography and Geology) http://www.accessexcellence.org/RC/earthspace.html Black Holes Black Holes GFSC NASA Gives more detail on the Cygnus X-1 black hole and provides a complete dictionary of terms. Also includes information on wormholes. http://imagine.gsfc.nasa.gov/docs/introduction/black_holes.html Amazing Facts about Black Holes Lake Afton Public Observatory answers the questions, such as what would happen if you fell in one (you'd up like a piece of spaghetti). http://www.twsu.edu/~obswww/o34.html Black Hole Simulations Image and simulations archive. Dozens of Raytraced and 3D models recreate everything from formation theories to Redshifts. http://physics.arizona.edu/~hart/bh/

77. Glossary At Grainger Observatory, PEA are used to record images of stars and galaxies. of the sky containing a pattern ofstars identified by the earth is divided into 88 constellations named after http://observatory.exeter.edu/Glossary.html

Glossary of Terms Astronomical Almanac: A compilation of many facts used by both amateur and professional astronomers. Some of the information such as a list of bright stars stays the same from year to year. Other information such as the celestial positions of the planets and information about eclipses changes each year. This book is published by the US Naval Observatory Asterism: A recognizable pattern of bright stars, usually (but not always) associated with a single constellation. Cassegrain telescope: A reflecting telescope in which the secondary mirror is mounted in front of the telescope and reflects light back down the tube through a hole in the center of the primary mirror to the eyepiece. CCD Camera: A digital camera attached to a telescope for low light conditions of astronomy. CCD stands for charged-coupled device. A CCD consists of a large array of light-sensitive elements that are used to record images of stars and galaxies. Instead of the image being recorded on film, the CCD image is placed in an image file on the computer. Constellation: A designated region of the sky containing a pattern of stars identified by name. The entire sky surrounding the earth is divided into 88 constellations named after mythological figures, animals, and objects. Each constellation occupies a region of the sky containing that star pattern. Each season different constellations are visible in the sky from any given location.

78. Comparing Astrology And Astronomy constellations are apparent associations of stars and galaxies, as seen fromEarth. In reality, these objects are very far away from each other. http://www.msnucleus.org/membership/html/k-6/uc/universe/4/ucu4_1b.html

Universe Cycle - Universe (4) Pre Lab BACKGROUND: Stars are balls of gas that emit energy created by fusion, a nuclear reaction within the star. There are many sizes and brightness of stars, ranging from super hot, blue-white stars (over 20,000EK) to cool red stars (3,000EK). Our Sun is a medium yellow star, towards the small and cool end of the spectrum. Current theory suggests that stars are born in nebulae, which are interstellar gas clouds. This is happening today. An example is the Orion Nebula (in the sword or bow of the Orion the Hunter constellation). Stars also die. Older stars types include red giants and supergiants. Constellations are apparent associations of stars and galaxies, as seen from Earth. In reality, these objects are very far away from each other. The stars that make up the constellations are all within our own Milky Way galaxy. The galaxies can be much further away; because of their distance, they appear as points of light to the naked eye. Constellations were very important to early people. They allowed them to find directions during the night, which helped them navigate on land and at sea. The yearly changes in the constellations also revealed to early farmers when spring and summer were approaching. This was more accurate than watching the Sun rise and set every morning.

79. Constellations Constellation Page to look at very detailed pictures of constellations. To find moreinformation about stars in particular, visit my stars and galaxies web page http://www.geocities.com/astronomy30/constellation.html

Seen from Earth, the stars seen to form patterns in the sky. These patterns are known as constellations. The skies around Earth have been divided into 88 different constellations, each one of which is supposed to represent a mythological person, creature or object. Constellation Facts: A constellation is a two-dimensional view of objects in three- dimensional space." "The Big Dipper, The Plough, in the United Kingdom is not a seperate constellation but is part of Ursa Major, the Great Bear." "Austrailian aboriginals have their own view of constellations- they see patterns in the dark spaces between stars." My favorite constellation is Orion. I think it's very interesting and it's always almost in the night sky. My favorite star lies in the constellation, Orion and it's name is Betelgeuse, sometimes pronounced 'Beetle-Juice'. (Just don't say it three times! ^_^) One idea when looking for your zodiac constellation that might help would be to look along the ecliptic (the path in the sky by the which the sun takes) and you will find all zodiac constellations. Not all zodiac constellations are visible at one time, though. Different ones are visible at varying months. I think that you find too that your zodiac constellation, that goes with your month of birth, may not be visible in the night sky. This is because of the way the zodiacs were created. People in Greece have a different viewpoint then us, therefore, your correct zodiac will show up in the sky during your month of birth, over Europe.

80. StarDate Online | Frequently Asked Questions Exploration » Astronomers and Observatories » stars and Nebulae » galaxies andCosmology What are shooting stars ? How did the constellations get their http://stardate.org/resources/faqs/

Contact StarDate About StarDate Friends of McDonald Sign up for Sky Tips FAQs Image Gallery Solar System Guide ... Resource List Program Search Keywords Site search Frequently Asked Questions FAQs are organized in the following categories: Stargazing and Star Lore Earth, Moon, and the Sun The Solar System Space Probes and Human Exploration ... Galaxies and Cosmology Stargazing and Star Lore What is the difference between a lunar and a solar eclipse? When are the next solar and lunar eclipses? How often do all the planets line up? Why do stars twinkle? ... Are any artificial satellites visible from Earth? Earth, Moon, and the Sun Why do we always see the same side of the Moon from Earth? Why does the Moon have phases? What is the difference between a solstice and an equinox? What is the chance of Earth being hit by a comet or asteroid? ... Why is the distance between Earth and Moon increasing? The Solar System How and when did the solar system form? How big is the solar system? Is there a tenth planet? Do all planets orbit the Sun in the same direction? ... What are comets made of? Space Probes and Human Exploration Are there plans to return to the Moon?

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