21. Comets the Sun is also likely to either impact one of the planets or the Sun or to slick site with lots of info about Comet HaleBopp and comets in general http://www.nineplanets.org/comets.html

Comets Unlike the other small bodies in the solar system, comets have been known since antiquity. There are Chinese records of Comet Halley going back to at least 240 BC. The famous Bayeux Tapestry , which commemorates the Norman Conquest of England in 1066, depicts an apparition of Comet Halley. As of 1995, 878 comets have been cataloged and their orbits at least roughly calculated. Of these 184 are periodic comets (orbital periods less than 200 years); some of the remainder are no doubt periodic as well, but their orbits have not been determined with sufficient accuracy to tell for sure. Comets are sometimes called dirty snowballs or "icy mudballs". They are a mixture of ices (both water and frozen gases) and dust that for some reason didn't get incorporated into planets when the solar system was formed. This makes them very interesting as samples of the early history of the solar system. When they are near the Sun and active, comets have several distinct parts: nucleus : relatively solid and stable, mostly ice and gas with a small amount of dust and other solids;

22. Calendar Conversion Program Kairos; Font And Keyboard Utilities commercial, demo available Win95/98/NT Includes calendars required by historians of astronomy and general historians. Many details are provided for Indian and Jewish calendars and much besides. There is also a display of positions of the Sun, Moon and planets, effectively replacing Tuckerman's tables. A horoscope display, and details of lunar visibility, are calculated from modern parameters. http://ourworld.compuserve.com/homepages/raymondm

23. Hypothetical Planets One general is said to have asked Is he sure they re natural? . A Russiangeneral named Alexander Garnowsky suggested four hypothetical planets but http://www.nineplanets.org/hypo.html

Appendix 7: Hypothetical Planets by Paul Schlyter pausch@saaf.se There have been a number of objects that were once thought to exist by astronomers, but which later 'vanished'. Here are their stories. Vulcan , the intra-Mercurial planet Mercury's Moon Neith , the Moon of Venus The Earth's Second Moon The Moons of Mars The 14th Moon of Jupiter Saturn's Ninth and Tenth Moons ... Nemesis , the Sun's companion star References Vulcan , the intra-Mercurial planet, 1860-1916, 1971 The French mathematician Urbain Le Verrier , co-predictor with J.C. Adams of the position of Neptune before it was seen, in a lecture at 2 Jan 1860 announced that the problem of observed deviations of the motion of Mercury could be solved by assuming an intra-Mercurial planet, or possibly a second asteroid belt inside Mercury's orbit. The only possible way to observe this intra-Mercurial planet or asteroids was if/when they transited the Sun, or during total solar eclipses. Prof. Wolf at the Zurich sunspot data center, found a number of suspicious "dots" on the Sun , and another astronomer found some more. A total of two dozen spots seemed to fit the pattern of two intra-Mercurial orbits, one with a period of 26 days and the other of 38 days.

24. The Sun general information, some statistical data and links. http://www.nineplanets.org/sol.html

The Sun Sol Hardcopy The New Solar System Summarizes what we've learned from interplanetary explorations in the last 25 years. My primary reference for The Nine Planets The Compact NASA Atlas of the Solar System This 'road map' of the solar system is the definitive guide for planetary science. Our Sun is a normal main-sequence star, one of more than 100 billion stars in our galaxy. diameter km mass kg ... K (surface) 15,600,000 K (core) The Sun is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the Solar System ( Jupiter contains most of the rest). It is often said that the Sun is an "ordinary" star. That's true in the sense that there are many others similar to it. But there are many more smaller stars than larger ones; the Sun is in the top 10% by mass. The median size of stars in our galaxy is probably less than half the mass of the Sun. The Sun is personified in many mythologies: the Greeks called it Helios and the Romans called it Sol The Sun is, at present, about 70%

25. GCSE PHYSICS  The Planets - General Information - Picture Of The Solar System - The planets. A planet is a natural satellite of a. To see this part of the siteyou need to become a member. Click on the link below to see how quick and http://www.gcsescience.com/pun3.htm

gcsescience.com gcsescience.com The Earth and Beyond The Planets A planet is a natural satellite of a To see this part of the site you need to become a member Click on the link below to see how quick and easy it is to join Become a Member Sections of this site open to non members are Catalysts and Energy Extraction ... Water , Tests for Ions and Gases from Chemistry Equations Waves Magnets ... Electromagnetism from Physics Headings The Earth and Beyond Questions gcsescience.com Contents Planets Index gcsescience.com

26. Saturn general information, some statistical data and links. http://www.nineplanets.org/saturn.html

Saturn The Bringer of Old Age Saturn is the sixth planet from the Sun and the second largest orbit : 1,429,400,000 km (9.54 AU ) from Sun diameter : 120,536 km (equatorial) mass : 5.68e26 kg Fun Stuff Saturn ScreenSaver See Saturn and its rings from space with this 3D Screensaver Hardcopy The New Solar System Summarizes what we have learned from interplanetary explorations in the last 25 years. My primary reference for The Nine Planets Encyclopedia of the Solar System A more scholarly introduction the planetary science for those who want to dig a little deeper. The Compact NASA Atlas of the Solar System This road map of the solar system contains lots of maps and data as well as photos. In Roman mythology , Saturn is the god of agriculture. The associated Greek god, Cronus , was the son of Uranus and Gaia and the father of Zeus (Jupiter). Saturn is the root of the English word "Saturday" (see Appendix 5 Saturn has been known since prehistoric times. Galileo was the first to observe it with a telescope in 1610; he noted its odd appearance but was confused by it. Early observations of Saturn were complicated by the fact that the Earth passes through the plane of Saturn's

27. JUPITER - ENCHANTED LEARNING SOFTWARE Atmosphere and Planetary Composition Great Red Spot......Jupiter is the fifth and largest planet in our solar system. general http://www.enchantedlearning.com/subjects/astronomy/planets/jupiter/

EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Click here to learn more. (Already a member? Click here. The Planets Zoom Astronomy JUPITER General Description Atmosphere and Planetary Composition Great Red Spot ... Activities, Web Links Jupiter is the fifth and largest planet in our solar system. This gas giant has a thick atmosphere, 39 known moons, and a dark, barely-visible ring. Its most prominent features are bands across its latitudes and a great red spot (which is a storm). Jupiter is composed mostly of gas. This enormous planet radiates twice as much heat as it absorbs from the Sun . It also has an extremely strong magnetic field. It is slightly flattened at its poles and it bulges out a bit at the equator. SIZE Jupiter's diameter is 88,700 miles (142,800 km). This is a little more than 11 times the diameter of the Earth . Jupiter is so big that all the other planets in our Solar System could fit inside Jupiter (if it were hollow). MASS AND GRAVITY Jupiter's mass is about 1.9 x 10

28. Earth general information, some statistical data and links. http://www.nineplanets.org/earth.html

Earth Terra, Sol III Earth is the third planet from the Sun and the fifth largest: orbit : 149,600,000 km (1.00 AU ) from Sun diameter : 12,756.3 km mass : 5.972e24 kg Fun Stuff Earth ScreenSaver Watch the Earth from space with this 3D Screensaver; also shows the Moon and more. Hardcopy Planet Earth Amazing pictures of Earth from space combine useful science and artistic beauty. Orbit : Nasa Astronauts Photograph the Earth A beautiful coffee table book . Kids often ask me which is my favorite planet. My answer is always "Earth". This book shows why. Earth is the only planet whose English name does not derive from Greek/Roman mythology. The name derives from Old English and Germanic. There are, of course, hundreds of other names for the planet in other languages . In Roman Mythology, the goddess of the Earth was Tellus - the fertile soil (Greek: Gaia terra mater - Mother Earth). It was not until the time of Copernicus (the sixteenth century) that it was understood that the Earth is just another planet. Mir space station and Earth's limb Earth, of course, can be studied without the aid of spacecraft. Nevertheless it was not until the twentieth century that we had maps of the entire planet. Pictures of the planet taken from space are of considerable importance; for example, they are an enormous help in weather prediction and especially in tracking and predicting hurricanes. And they are extraordinarily beautiful.

29. SATURN - ENCHANTED LEARNING SOFTWARE Saturn is the sixth planet from the sun in our solar system. It is the secondlargestplanet in our solar system. general INFORMATION ON SATURN http://www.enchantedlearning.com/subjects/astronomy/planets/saturn/

EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Click here to learn more. (Already a member? Click here. The Planets Zoom Astronomy SATURN General Description Inside Saturn and the Atmosphere Rings ... Activities, Web Links GENERAL INFORMATION ON SATURN Saturn is the sixth planet from the sun in our solar system. It is the second-largest planet in our solar system (Jupiter is the largest). It has beautiful rings that are made mostly of ice chunks (and some rock) that range in size from the size of a fingernail to the size of a car. Saturn is made mostly of hydrogen and helium gas. Saturn is visible without using a telescope, but a low-power telescope is needed to see its rings. SIZE AND SHAPE Saturn is about 74,898 miles (120,536 km) in diameter (at the equator at the cloud tops). This is about 9.4 times the diameter of the Earth . 764 Earths could fit inside a hollowed-out Saturn. Saturn is the most oblate (flattened) planet in our Solar System. It has a equatorial diameter of 74,898 miles (120,536 km) (at the cloud tops) and a polar diameter of 67,560 miles (108,728 km). This is a difference of about 10%. Saturn's flattened shape is probably caused by its fast rotation and its gaseous composition. RINGS Saturn's beautiful rings are only visible from Earth using a telescope. They were first observed by Galileo in the 17th century.

30. Pluto Guide with both general and statistical data. http://www.nineplanets.org/pluto.html

Pluto Mathews: Pluto - The Renewer Hardcopy Pluto and Charon A history of what we've learned about Pluto from ground by Dr. Alan Stern, principal investigator on the upcoming New Horizons mission to Pluto. Encyclopedia of the Solar System A more scholarly introduction the planetary science for those who want to dig a little deeper. Pluto is the farthest planet from the Sun (usually) and by far the smallest. Pluto is smaller than seven of the solar system's moons (the Moon Io Europa Ganymede ... Titan and Triton orbit : 5,913,520,000 km (39.5 AU ) from the Sun (average) diameter : 2274 km mass : 1.27e22 kg In Roman mythology, Pluto (Greek: Hades ) is the god of the underworld. The planet received this name (after many other suggestions ) perhaps because it's so far from the Sun that it is in perpetual darkness and perhaps because "PL" are the initials of Percival Lowell Pluto was discovered in 1930 by a fortunate accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune , based on the motions of Uranus and Neptune. Not knowing of the error

31. Astrospacecosmos Astronomy Stars Planets A general information site for those who have a beginner's curiosity about the stars and planets http://users.pandora.be/benastro

Astro news Comets Starmap Nebulae ... Asteroids E xplore the Universe This ghostly apparition is actually an interstellar cloud caught in the process of destruction by strong radiation from a nearby hot star. This haunting picture from the Hubble telescope shows a cloud y illuminated by light from the bright star Merope. Located in the Pleiades star cluster, the cloud is called IC 349 or Barnard's Merope Nebula. Click on the images for a bigger one Galaxy NGC 1300 is often touted as being the most spectacular example of a barred spiral galaxy . Galaxy NGC 1300 is a barred spiral galaxy located some 69 million light years away toward the constellation Eridanus. NGC 1300 does not have an active nucleus, however, indicating either that there is no black hole present now. The European Space Agency T he European Space Agency is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the people of Europe Somewhere, something incredible is waiting to be known.

32. Introduction And FAQ The Nine planets is a collection of information about our Solar System intendedfor a general audience with little technical background. http://seds.lpl.arizona.edu/nineplanets/nineplanets/intro.html

Introduction and FAQ The Nine Planets is a collection of information about our Solar System intended for a general audience with little technical background. No special expertise or knowledge is needed; all technical and astronomical terms and proper names are defined in the glossary . The bulk of this material should be familiar to planetary scientists and astronomers but they may find a few interesting tidbits, too. This site consists of about pages, one page for each major body in the Solar System. Each page has: a large picture of its object and usually several smaller thumbnail images (all linked to their full-size originals) some scientific and historical facts about it, if the object has satellites then its page has a table of data on them and links to their pages, links to more images and information about the object elsewhere on the Web, and a list of open issues for which we as yet have no answers. To truly justify the title of "Multimedia Tour", I've also included: short sound clips from Holst 's The Planets (about 10 seconds or 180k each) for seven of the planets;

33. Darwin Home Page - Space Infrared Interferometer - Planet Finding Mission Designed for general astrophysics and search for signs of life on Earthlike planets orbiting nearby stars. It is a candidate cornerstone 9 for a European Space Agency mission in 2015. http://ast.star.rl.ac.uk/darwin/

Main Mission Status Planets ... Links Aims: Characterising planetary systems orbiting nearby stars Searching for signs of life on any Earth-like planets found Performing general astrophysics The European Space Agency has selected the "InfraRed Space Interferometer - Darwin" as a mission for its Horizons 2000 programme. Selection of a launch date, probably at or after 2015, will be made on cost, science and technology grounds sometime before then. These pages give some information on this project, and thus are supplementry to the official ESA Darwin website. See also ESA Science and ESA RSSD Astrophysics A description of the interferometer and the science may be found in the mission page. Darwin spacecraft Detecting Venus, Earth, and Mars 30 light-years away Detecting life on an Earth-like planet 30 light-years away Caption Other Darwin pictures High Res pic Caption ... Rutherford Appleton Laboratory (RAL) Page last modified - 2002 May 17th

34. The Planets For Kids A studentbased website focusing on general information about the planets, moon, and sun. http://www2.lhric.org/pocantico/fitzgerald/99/planets.htm

The Planets for Kids Read our Riddles Have More Fun Get ready, fasten your seatbelts and prepare for blastoff! Come with our second grade and travel to the planets. See all the neat stuff you can learn about each planet. Ready? Do Our Wordsearch More Information Blastoff! We're on our way on a trip through our Solar System. By Arun, Rodney, Voneric Mercury Venus Earth Earth ... Moon more fun things Pocantico Hills School Mrs. Fitzgerald's Class email us hongell@pocanticohills.org You are visitor since January 10, 2000. This page was last updated on October 16, 2004

35. Twelveplanets.com Daily horoscopes and general sun sign information. http://www.twelveplanets.com/

Sunday September 25 2005 Zodiac Signs Aries Taurus Gemini Cancer ... Pisces Miscellaneous Daily Horoscope Birth Month Books Chinese Zodiac ... Zodiac Match Guest Book Sign Guest Book View Guest Book What zodiac sign are you? Sign Month Aries March 21 -April 20 Taurus April 21 - May 20 Gemini May 21 - June 20 Cancer June 21 - July 20 Leo July 21 - Aug 21 Virgo Aug 22 - Sept 22 Libra Sept 23 - Oct 22 Scorpio Oct 23 - Nov 22 Sagittarius Nov 23 - Dec 20 Capricorn Dec 21 - Jan 19 Aquarius Jan 20 - Feb 18 Pisces Feb 19 - March 20

36. WebStars: Astrophysics In Cyberspace Highlights include general information, images of the impact, It has beenextracted from the Welcome to the planets program distributed on the http://heasarc.gsfc.nasa.gov/docs/outreach/webstars.html

Help/FAQ What's New Site Map NASA Homepage ... APOD WebStars: Astrophysics in Cyberspace This list of astronomical resource sites is intended as a resource for users who have a general interest in astronomical topics. For a translation of any acronyms you may have seen in our pages check out our acronyms page Last updated Wednesday, 13-Jul-2005 09:18:31 EDT. Curator: Karen Smale Table of Contents In the News The Solar System Exploring Mars Solar Eclipse ... Other astronomy sites In the News July 8, 2005 NASA's Deep Impact Tells a Tale of the Comet Data from Deep Impact's instruments indicate an immense cloud of fine powdery material was released when the probe slammed into the nucleus of comet Tempel 1 at about 10 kilometers per second (6.3 miles per second or 23,000 miles per hour). The cloud indicated the comet is covered in the powdery stuff. The Deep Impact science team continues to wade through gigabytes of data collected during the July 4 encounter with the comet measuring 5-kilometers-wide by 11-kilometers-long (about 3-miles-wide by 7-miles-long). June 9, 2005

37. Springer - Your Publishers Of Books, Journals, And Electronic Media An international journal concerned with the broadest range of dynamical astronomy and its applications, as well as with peripheral fields. The papers published include treatments of the mathematical, physical and computational aspects of planetory theory, lunar theory, general and special perturbation theory, ephemerides, resonance theory, geodesy of the Earth and the planets, dynamics, the 3body problem, the N-body problem, space mechanics, ring systems, galactic dynamics, reference frames, time, relativity, nongravitational forces, computer methods, computer languages for analytical developments, and database management. http://www.wkap.nl/journalhome.htm/0923-2958

Springeronline.com - Our new domain Please choose your location on the buttons above for information, special sales and services targeted to where you live. Springeronline.com - Europe Please select an item from the list below. General Springer Springer Germany Springer United Kingdom Springer Switzerland Springeronline.com - North America Springeronline.com - South America Springeronline.com - Europe Springeronline.com - Africa Springeronline.com - Asia Springeronline.com - Australia and Oceania

38. Open Course : Astronomy : Introduction : Lecture 5 : Motion Of The Planets Mercury and Venus (the inner planets) have smaller orbits than the Earth, whileMars, This implied that Kepler s Third Law was a general principle. http://www.opencourse.info/astronomy/introduction/05.motion_planets/

Open Course Info Contents Index Introduction to Astronomy Lecture 5: The Motion of the Planets The heavens themselves, the planets, and this centre Observe degree, priority, and place, Insisture, course, proportion, season, form, Office, and custom, in all line of order: William Shakespeare, Troilus and Cressida 5.1 Direct and Retrograde Motion In addition to the stars, the Sun, and the Moon, there are several other objects in the sky which are easily visible at night. From the ancient perspective, a planet is a point of light in the sky that moves relative to the stars, much as the Sun and Moon do. The name comes from the Greek for "wanderer". Photo Information With the naked eye, one can see five planets: Mercury Venus Mars Jupiter , and Saturn Extra: the Sun, Moon, and planets are associated with ancient gods , and their number is the basis of our seven-day week Like the Sun and the Moon, the planets all move near the ecliptic, never being more than a few degrees away. In the photo at the right, you can see (from top to bottom) Saturn, Venus, Jupiter, and Mercury in alignment with the recently set Sun.

39. Cyprus, Astronomy, Space, Telescopes, Planets, Moon, Solar System Java applets of the solar system and the moon's current phase; comprehensive illustrated information about the planets, comets, nebulae, meteors and other phenomenon; monthly nightsky data; links; a forum; latest club and general news, and membership information. http://www.cyprusastronomy.com/

Our deepest sympathies to the families of those on board on the Helios flight ZU522 from Larnaca to Athens and Prague that crashed north of Athens on the 14th of August 2005. Note: The site is being updated... We are sorry for any inconvenience . Quick Astronomy Links New Astronomy Forum Old Astronomy Forum Sky Calendar Astronomy and Space News ... Cyprus SETI@home Official Website Search our site Search this site or the web powered by FreeFind Site search Web search Our site in a glance Choose from the list About Astronomy Andromeda Galaxy M31 Annual Meteor Shower Articles Asteroids Astronomical Glossary Astronomical Tables Astrophotography Definitions Astrophotography Links Astrophotography Astrophotography Basics August Event Astro-News Before Buying A Telescope Black Holes Choosing the Right Telescope Comets Constellations Contact us Equipment Events from the past Events Explore Fireballs and Meteorite Galaxy

40. SPACE.com -- 30 Billion Earths? New Estimate Of Exoplanets In Our Galaxy If one includes rocky planets in general, like Mercury, Venus and Mars, thenthey are probably more common than Jupiters, he said. http://www.space.com/scienceastronomy/astronomy/jupiter_typical_020128.html

advertisement New Era Dawns in Search for Other Worlds Study Doubles Number of Potential Earth-Like Planets Kepler Mission to Find Earth-Like Planets Gets Green Light Did Jupiter Bully Other Planets In Sibling Rivalry? 30 Billion Earths? New Estimate of Exoplanets in Our Galaxy By Robert Roy Britt Senior Science Writer posted: 07:00 am ET 29 January 2002 Chances are you haven't spent a whole lot of time wondering how many Jupiter-like planets exist in our galaxy. But Charley Lineweaver has, because it bears on a more important question: How many potentially habitable planets are there? New calculations by Lineweaver and Daniel Grether, both of the University of New South Wales in Australia, provide an encouraging answer to this question. The researchers expect a flood of Jupiters will be found, perhaps 50 percent more than currently expected. Each such discovery would be significant in the hunt for planets that could harbor life. Why? Because much of the evolution of our own solar system, including the formation of Earth, was orchestrated or affected by Jupiter, the largest planet with by far the bulk of the solar system's mass, excepting the Sun, of course. "Our solar system is Jupiter and a bunch of junk," as Lineweaver puts it.

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