101. Astronomy For Kids Offers details about the size, the position and the movement of the planet. http://www.frontiernet.net/~kidpower/venus.html

VENUS Is the closest planet to the Earth. It is about the same size as the Earth. Is the second planet in order from the Sun. It is about 108 million kilometers from the Sun. Makes one complete orbit around the Sun every 224.7 days. Rotates on its axis more slowly than any other planet. It completes one rotation in about 243 days and 24 minutes. Is the brightest object in our sky, besides the Sun and Moon. Has no satellites.

102. Astronomy For Kids Venus Includes details about its location, its visibility, its size and its surface. http://www.dustbunny.com/afk/planets/venus/

You are seeing this message because you are using an out-of-date browser. Please click here for more information. Venus Facts Distance from Sun Approximately 65 million miles Number of Moons None Diameter 7,200 miles Length of Day 243 Earth days Length of Year 225 Earth days Named for Roman goddess of beauty Visited by Galieo, Magellan, Mariner 10 and others Beauty Can Be Only Skin Deep The second planet from the Sun has been named for the Roman goddess of love and beauty. When you see it in the morning or evening sky, or if you are lucky enough to have a telescope, you would agree with this name. However, if you were unfortunate enough to be dropped onto the surface of this planet, you would find that it is a very unpleasant place indeed. The atmosphere of Venus is made up almost entirely of clouds of sulfuric acid, the temperature stays constant at around nine hundred degrees Fahrenheit and winds on the surface blow constantly at hundreds of miles per hour. The atmospheric pressure on the surface of Venus is much like that in the ocean here on Earth at a depth of around half a mile. It is an extremely dangerous place, and the two spacecraft that have landed on Venus have managed to survive for just long enough to send back a few pictures before they were crushed by the pressure of the atmosphere and melted by the extremely high temperatures.

103. More Astronomy On WWW And AOL astronomy links Introduced in Other Languages. Astronomía links by CarlosJavier Mata, in Spanish. astronomy links Compiled at High Schools. http://members.aol.com/gca7sky/www.htm

More Astronomy Link Places Up Home Astronomy Main Index Contents On the Internet Resources Primarily on Astronomy Astronomy Links Introduced in Other Languages Astronomy Links Compiled at High Schools ... More Specialized Search Places On the Internet Resources Primarily on Astronomy Astro-Web Consortium (I haven't listed all of them. You can choose any of them.) These are good professional level website directories. The WWW Virtual Library: Astronomy and Astrophysics (not current URL) @ NRAO @ Space Telescope Science Institute @ MSSSO (Australia) Astronomy News and Links Susanne Weimer. (In German and English.) The Star-s Family of Astronomy and Related Resources Accretion Disk.Org ASTRONET by Dutch science journalist Carl Koppeschaar Astronomy and the Media UCLA Astronomy and Space Science (Links compiled by the U.S. Geological Survey) @ Univ. of Hertfordshire (UK) QMW Astronomy Unit - Astronomy Links on the WWW (UK) Educational Resources in Physics, Astronomy, and Related Fields Sonoma State Univ. Dept. of Physics and Astronomy Expanding Universe: Astronomy , links indexed by the Dewey Decimal System, #:520-525 (in Canada) NASA Online Educational Resources NASA Office of Spaceflight "Hotlist"

104. ASTRO KIDS: Venus Details about the shape, the size, the surface and the atmosphere of the planet. http://www.astronomy.com/content/static/AstroForKids/venus.asp

From space Venus looks like Earth, but it isn't. On Earth, the clouds are made of water vapor. On Venus, the clouds are made of sulfuric acid. JPL / NASA Venus is the second planet from the sun. Its average distance from the sun is 67 million miles. Sometimes called Earth's sister planet, Venus is slightly smaller than Earth. It's also our closest neighbor at about 25 million miles away from Earth. Venus is hot enough to melt lead. Its surface temperature can get close to 900°F. This makes Venus the hottest place in the solar system after the sun. After the sun and moon, Venus is the brightest object in the sky. Because its thick clouds reflect most of the light Venus gets from the sun, the planet looks like a very bright star in the morning (just before sunrise) or evening (just after sunset) sky. The surface of Venus is covered with craters, mountains, volcanoes, and lava plains. Maxwell Montes is the highest point on Venus. It is more than 7 miles high. Standing on Venus would be like standing in a shallow bowl. The atmosphere is so thick and heavy that it bends light, making the ground appear to curve upward in all directions. The planet's atmosphere is 90 times heavier than Earth's. Venus has sulfuric acid clouds. Its atmosphere is mostly carbon dioxide (96%), nitrogen (3.5%), and carbon monoxide, argon, sulfur dioxide, and water vapor (all less than 1%).

105. Astronomy For Kids Provides details about the composition, the position, the movement and the moons of the planet. http://www.frontiernet.net/~kidpower/uranus.html

URANUS Is composed mainly of hydrogen and helium gases. Its mass (weight) is over 14 times that of the Earth. Its diameter is 4 times that of our planet. Is the seventh planet in order from the Sun. It is about 2.9 billion kilometers from the Sun. Makes one complete orbit around the Sun every 84 years. Rotates on its axis about the same speed as the Neptune. It completes one rotation in about 17 hours and 14 minutes. Can sometimes be seen with the naked eye. Has a total of 15 satellites (or moons).

106. Astronomy For Kids Uranus Offers details about the location, the visibility, the size and the rings of this planet. http://www.dustbunny.com/afk/planets/uranus/

You are seeing this message because you are using an out-of-date browser. Please click here for more information. Uranus Facts Distance from Sun Approximately 1.8 billion miles Number of Moons At least 21 Diameter Approximately 32,000 miles Length of Day 17 Earth hours Length of Year 84 Earth years Name Ancient Greek god. Visited by Voyager 2 A Seemingly Featureless Planet Uranus, along with Neptune and Pluto, is in the most distant region of our solar system. The giant planet, which is another of the gas giants of our solar system, is more than twice as far away from the Sun as Saturn. If you get a chance to look at Uranus through a telescope, all you will see is a faint blue disk that appears exceptionally dull and lifeless. Even pictures sent back by the Voyager mission and the Hubble Space Telescope seem to show that Uranus is a dull, unexciting place. As always, though, things aren't what they seem. Uranus has many interesting features, including its ring system, varied moons and much more. The bland face that the planet shows to us humans hides high speed winds, the fact that Uranus is tilted on its side and a very mysterious weather system. Read on to find out more about this mysterious world! Uranus from Voyager A picture of Uranus taken by the Voyager 2 spacecraft.

107. ASTRO KIDS: Uranus Details about the movement, the size, the temperature, the atmosphere, the gravity and the moons of the planet. http://www.astronomy.com/content/static/AstroForKids/uranus.asp

Uranus gets its blue-green color from methane. JPL / NASA The seventh planet from the sun, Uranus orbits at a distance of about 1,784 million miles (more than 19 times farther than Earth). Uranus is the planet tipped on its side. Uranus spins more like a barrel on its side than a top. This strange tilt may be the result of being hit by a fast comet that tipped Uranus on its side. Uranus spins on its axis one time every 17 hours and goes around the sun one time every 84 Earth years. About 4 Earths would fit across the face of Uranus. Its diameter is 31,763 miles, making it the third-largest planet in the solar system. Astronomy.com: Terri Field The atmosphere of Uranus holds hydrogen (83%), helium (15%), and methane (2%). Methane is what gives Uranus its blue-green color. There are 11 narrow rings that encircle Uranus. William Herschel discovered Uranus in 1781. To escape the gravity of Uranus, you need to travel 47,600 miles per hour. The planet's 5 largest moons are: Ariel, Umbriel, Titania, Oberon, and Miranda. There are at least 10 smaller moons orbiting closer than Miranda, and there may be another 6 moons farther away from the planet. Uranus was the father of Saturn and grandfather of Jupiter.

108. Astronomy For Kids Provides a picture and brief facts about the planet. http://www.frontiernet.net/~kidpower/pluto.html

PLUTO Is the smallest planet. Its mass (weight) is 1/500th that of the Earth. Its diameter is about 1/6 that of our planet. Is the ninth planet in order from the Sun. It is about 5.9 billion kilometers from the Sun. Makes one complete orbit around the Sun every 248 years. Rotates on its axis slowly when compared to Earth. It completes one rotation in about 6 days and 9 minutes. Is sometimes known as a double-planet because it has a moon (Charon) that orbits it. Has a total of 1 satellite (or moons).

109. Astronomy For Kids Pluto Includes details about its location and facts related to visibility, size, surface and its moons. http://www.dustbunny.com/afk/planets/pluto/

You are seeing this message because you are using an out-of-date browser. Please click here for more information. Pluto Facts Average Distance from Sun Approximately 3.6 billion miles Number of Moons One Diameter 1417 miles Length of Day Over 6 Earth days Length of Year 248 Earth years Name Comes from the Roman god of the underworld. Small, Cold, Dark and Lonely Pluto The last member of our family of planets is Pluto. At an average distance of over three billion miles from the Sun, Pluto, and its tiny moon Charon, are very much off by themselves. Pluto is so small that six moons of the solar system are larger than this small planet. As a matter of fact, there has been a lot of discussion about whether Pluto is a planet at all, given the fact that it is so tiny and its orbit is both an exaggerated ellipse and doesn't fall into the same plane as the orbits of the rest of the planets. If we had it to do over again, Pluto would probably not be classified as a planet, but as a large asteroid. We have been calling it a planet for so long it seems like a shame to change it now, though. Image courtesy of: Hubble Space Telescope An Unknown Icy World Pluto is so far away that even the mighty Hubble Space Telescope can't get us a very good picture. The image at right is the best image to date we have of this distant world. Very little is known about Pluto except that it is very, very cold and exceptionally dark. At this distance, the Sun is very much like all the rest of the stars you would see from its surface.

110. ASTRO KIDS: Pluto Offers details about its temperature, its size and its gravity. http://www.astronomy.com/content/static/AstroForKids/pluto.asp

Each hemisphere of Pluto is seen in these two different views. A. Stern/M. Buie/NASA/ESA PLUTO Pluto is the ninth planet from the sun. It orbits at a distance of 3,647 million miles (nearly 40 times as far from the sun as Earth is). With a diameter of only 1,485 miles, Pluto is the smallest planet in the solar system. It takes Pluto 248 Earth years to go around the sun one time, and 6 Earth days to spin on its axis one time. Scientists don't know if Pluto has an atmosphere or not. If it does, it may be made of methane and nitrogen. Pluto's surface has dark markings and is probably made of methane and nitrogen ice. Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory. Because Pluto is smaller than many of the moons that orbit other planets, some scientists think Pluto should be reclassified as an asteroid. But unlike most asteroids, Pluto is round like the planets. To escape Pluto's gravity you need to travel 2,500 miles per hour. Pluto and Charon A. Stern/M. Buie/NASA/ESA Pluto has one known moon, Charon, which was discovered in 1978. This moon is about half as big as Pluto. Astronomy.com: Terri Field

111. Astronomy For Kids Includes a picture and brief facts about this planet. http://www.frontiernet.net/~kidpower/neptune.html

NEPTUNE Is very similar to Uranus in size. Its mass (weight) is over 17 times that of the Earth. Its diameter is 4 times that of our planet. Is the eighth planet in order from the Sun. It is about 4.5 billion kilometers from the Sun. Makes one complete orbit around the Sun every 164.79 years. Rotates on its axis about the same speed as Uranus. It completes one rotation in about 18 hours and 26 minutes. Has a weather system that is very active. Some storms with winds of 400 miles per hour have lasted for hundreds of years on its surface. Has a total of 8 satellites (or moons).

112. Astronomy For Kids Neptune Provides details about the location, the visibility and the moons of this planet. http://www.dustbunny.com/afk/planets/neptune/

You are seeing this message because you are using an out-of-date browser. Please click here for more information. Neptune Facts Distance from Sun Approximately 2.8 billion miles Number of Moons At least 11 Diameter Approximately 31,000 miles Length of Day 16 Earth hours Length of Year 165 Earth years Name Roman god of the sea. Visited by Voyager 2 A Windy, Cold Blue World Neptune is the eighth planet from the Sun and, at this distance, the Sun looks a whole lot like the other stars that would be visible from this planet. Actually, there are times when Neptune is the furthest planet from the Sun. Pluto, which has a very elliptical orbit, is sometimes closer to the Sun that Neptune for a period of time, but, for the most part, Neptune is closer to the Sun than Pluto. Neptune was also the last planet visited by Voyager 2 before it left our solar system. Before the arrival of the Voyager mission in 1989, we knew very little about this planet because of its great distance from us. As usual, though, Voyager's visit gave us a lot of surprises. We found out that is was a very cold, windy place with very interesting clouds and a moon that actually had "geysers" something like the ones we have here on Earth. In addition, the history-making mission discovered an additional six moons that were unknown to us. All in all, Neptune turned out to be a big surprise to almost everybody. Neptune from Voyager A picture of Neptune taken by the Voyager 2 spacecraft.

113. ASTRO KIDS: Neptune Includes images with the planet. Offers details about its temperature and its surface. http://www.astronomy.com/content/static/AstroForKids/neptune.asp

JPL/NASA Neptune is the eighth planet from the sun. It orbits at an average distance of 2,794 million miles (30 times farther than Earth). About 4 Earths would fit across the face of Neptune. Neptune is slightly smaller than Uranus and has a diameter of 30,775 miles. Neptune once had a Great Dark Spot that is like Jupiter's Great Red Spot. JPL/NASA It takes 165 Earth years for Neptune to go around the sun one time, but only 16 Earth hours for it to spin on its axis once. Neptune's moon Triton has a surface that looks a bit like the skin of a cantaloupe. JPL/NASA Neptune is encircled by a collection of 6 narrow rings. Because some places have more particles than in others, Neptune's rings form arcs around the planet. The atmosphere of Neptune holds hydrogen (79%), helium (18%), and methane (3%). Methane gives Neptune its blue color. The white spots on Triton are geysers. The black streaks are material being shot out of the geysers. JPL/NASA Neptune's atmosphere has a striped pattern like Jupiter and Saturn. Neptune once had a Great Dark Spot similar to Jupiter's Great Red Spot. To escape Neptune's gravity you need to travel 52,600 miles per hour.

114. Astronomy For Kids Includes details about the size, the position, the movement and the moons of the planet. http://www.frontiernet.net/~kidpower/saturn.html

SATURN Is the second largest of all the planets. Its mass (weight) is over 95 times that of the Earth. Its diameter is over 10 times that of our planet. Is the sixth planet in order from the Sun. It is about 1.4 billion kilometers from the Sun. Makes one complete orbit around the Sun every 29.46 years. Rotates on its axis at a very fast speed. It completes one rotation in about 10 hours and 39 minutes. Is known for the many rings that go around it. Has a total of 21 satellites.

115. Astronomy For Kids Saturn Offers details regarding the location, the visibility, the size and the rings of the planet. http://www.dustbunny.com/afk/planets/saturn/

You are seeing this message because you are using an out-of-date browser. Please click here for more information. Saturn Facts Distance from Sun Approximately 856 million miles Number of Moons At least 30 Diameter Approximately 86,000 miles Length of Day 10 hours, 39 minutes Length of Year 29.5 years Name Roman god of agriculture Visited by Pioneer 11, Voyager 1, Voyager 2, Cassini (2004) The Solar System's "Lord of the Rings" Saturn has been a source of wonder and amazement for Earth dwellers since ancient history. This sense of wonder increased in 1610 when Galileo turned his first telescope on this giant planet and was the first person to see Saturn's beautiful ring system. What Galileo saw, although he didn't see it clearly, was the beautiful system of rings that surround the giant planet. His early telescope wasn't good enough to show details in the rings, so he wasn't quite sure what he was seeing, but he certainly realized that it was something very special. (Saturn was the first planet I ever saw through my telescope and I will never forget how stunning it was to see the rings for the first time.) The advantage that we have now is that we can see the rings of Saturn using almost any moderately priced telescope. A good telescope allows us to see that there isn't just one ring around Saturn, but that what appears to be one ring through a low powered telescope is revealed as a complicated system of rings through a good telescope.

116. ASTRO KIDS: Saturn Provides images and facts about the size, the rings, the temperature and the moons of the planet. http://www.astronomy.com/content/static/AstroForKids/saturn.asp

Reta Beebe /STScI / NASA Saturn is the sixth planet from the sun. It orbits the sun at a distance of 888 million miles (about 10 times as far from the sun as Earth). Saturn would fit 9 1/2 Earths across its face. It is the second-largest planet in the solar system and has a diameter of 74,898 miles. Saturn is also called the Ringed Planet. Although Jupiter, Uranus, and Neptune also have ring systems, Saturn's is the largest. Saturn's rings are 169,800 miles across, but only 10 yards thick. Saturn's moon Mimas looks like the Death Star spacecraft from Star Wars JPL/NASA Saturn's rings are made of ice and rock particles, some as big as a mini-van. If you could find a bathtub big enough to put Saturn in, it would float. Saturn's density is less than water. It takes Saturn 29 Earth years to go around the sun one time, but only 11 hours to spin on its axis one time. Saturn looks like a ball that is being squished. Because Saturn spins so fast, its middle bulges while its poles flatten out. This makes Saturn look like somebody is squeezing it. The atmosphere of this Ringed Planet is like Jupiter's atmosphere. Saturn holds mostly hydrogen (97%), helium (3%). Saturn also has beautiful bands like Jupiter, but these colorful features are hidden by haze and smog that make up the planet's high atmosphere.

117. Astronomy For Kids Includes a picture and brief facts about this planet. http://www.frontiernet.net/~kidpower/mercury.html

MERCURY Is about the same size as the Moon. Its mass (weight) is 1/20th that of the Earth. Its diameter is 2/5 that of our planet. Is the closest planet to the Sun. It is about 58 million kilometers from the Sun. Makes one complete orbit around the Sun every 87.97 days. Rotates on its axis very slowly compared to Earth. It completes one rotation in about 58 days and 15 minutes. Is covered with mountains, craters, ridges and valleys. Has no satellites.

118. ASTRO KIDS: Mercury Provides details about its size, its movement, its atmosphere and its surface. http://www.astronomy.com/content/static/AstroForKids/mercury.asp

JPL/NASA Mercury is the closest planet to the sun. Its average distance from the sun is 36 million miles. Mercury is about 3,030 miles (4,878 km) across. That makes it the second-smallest planet in the solar system; only Pluto is smaller. In fact, Mercury is just a little bigger than Earth's moon. It's also covered with craters just like the moon. Mercury's year (the time it takes to orbit the sun one time) is 88 Earth days long, but one day (the time it takes to rotate from sunrise to sunrise) is 176 Earth days long. Because Mercury is so close to the sun, it has the smallest orbit of all the planets. That means it goes around the sun very quickly (88 Earth days or about 3 Earth months). Mercury is covered with craters. JPL/NASA Although Mercury goes around the sun quickly, it spins very slowly on its axis. For every year on Mercury, the planet spins 1 1/2 times (about 59 Earth Days or 2 Earth months). But while Mercury is slowly spinning, it is still speeding its way around the sun. Mercury has to spin another 1 1/2 times for the sun to rise over the same spot. That means one day (sunrise to sunrise) on Mercury is about 6 Earth months long, and that's twice as long as Mercury's year! So every day on Mercury means 2 years! If you lived on Mercury, you would have 2 birthdays every day!!

119. Astronomy For Kids Includes a picture and brief facts about this planet. http://www.frontiernet.net/~kidpower/mars.html

MARS Is sometimes called the Red Planet. Its mass (weight) is 1/10th that of the Earth. Its diameter is 1/2 that of our planet. Is the fourth planet in order from the Sun. It is about 228 million kilometers from the Sun. Makes one complete orbit around the Sun every 686.98 days. Rotates on its axis about the same speed as the Earth. It completes one rotation in about 24 hours and 37 minutes. Has seasons similar to our planet, but they last much longer. Has a total of 2 satellites (or moons).

120. ASTRO KIDS: Mars Images, details and facts about this planet, its surface and its temperature. http://www.astronomy.com/content/static/AstroForKids/mars.asp

JPL/NASA Mars is the fourth planet from the sun. Its orbit is roughly 142 million miles from the sun. The planet's reddish color is caused by rust (iron oxide) in the soil. Mars is the planet most like Earth. It takes 687 Earth days (about 2 Earth years) for Mars to go around the sun one time, and Mars spins on its axis at about the same speed as Earth does. It takes 24 hours and 37 minutes (about 1 Earth day) for Mars to rotate one time. Part of the middle section of Valles Marineris JPL/NASA Olympus Mons is the largest volcano peak in the solar system. JPL/NASA Mars has the largest canyon (Valles Marineris), and the highest volcano (Olympus Mons) in the solar system. If Valles Marineris were on Earth, it would span the United States, from New York on the East Coast to California on the West Coast. It is about 1,300 miles long, 310 miles wide, and about 5 miles deep. Olympus Mons is nearly 3 times higher than Mount Everest. It rises above the Martian surface more than 82 thousand feet. This giant volcano's base is the size of Missouri. There are also lots of channels on Mars, and they look like Earth's river channels. Most scientists believe water once flowed on the martian surface, but new studies suggest there may still be water in some places on the surface.

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