What are the Outer planets? The four planets farthest from the
sun are known as the outer planets. Jupiter, Saturn, Uranus, and
Neptune
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Jupiter
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Jupiter, the fifth planet from the Sun, is a gas giant. A gas
giant is a very large planet made mostly of gases. Jupiter is the
largest planet in our solar system. In fact, if it were hollow, it
is so big that all of the other planets could fit inside it!
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Jupiter has many moons. Galileo was the first person to see the
four largest moons through his telescope in 1610. They are about
the size of Earth's moon. One Example is Europa This is the
smoothest object in the solar system.
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Jupiters atmosphere has a weather system called the Great Red
Spot that has been raging for centuries. It is a disturbance more
than three times the size of Earth.
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Saturn
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The sixth planet from the Sun, Saturn is also a gas giant. Like
Jupiter, Saturns atmosphere is mostly hydrogen and helium. The
Voyager space probe explored Saturns rings. It showed that the
particles that make up the rings range in size from tiny grains to
boulders.
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Using the chart, What is one reason people cannot live on
Jupiter and Saturn? They are both too cold to live on!
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Using the chart, What planet has more moons? Jupiter with at
least 63!
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hmmm I wonder why it says at least for the number of
moons??
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Uranus
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In 1781, William Herschel discovered a seventh planet orbiting
the Sun. The gas giant Uranus is the farthest planet you can see
without a telescope. Uranus is so cold that the methane is a
liquid. Tiny drops of liquid methane form a thin cloud that covers
the planet. This gives Uranus its fuzzy blue-green look.
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Uranus rotates on its side. No one knows for sure why Uranus
has this odd tilt. Scientists think that a very large object may
have collided with the planet when the solar system was still
forming. This bump may have knocked Uranus onto its side.
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Neptune
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Neptune is the eighth planet from the Sun. It is the smallest
of the gas giants. Even so, if Neptune were hollow, it could hold
about 60 Earths. It is so far away that it can't be seen without a
telescope. In 1846 astronomers discovered Neptune. A few days later
they spotted Triton, Neptune's largest moon.
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Which planet has a larger diameter? Uranus
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How much longer is the Earth day on Uranus? One hour
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Galileo lived from 1564 to 1642. He was a mathematician and
astronomer. He agreed with Copernicus that all planets revolve
around the Sun. Galileo used a telescope to observe the Sun, Moon,
planets, and stars.
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When I saw Saturn through my telescope, I was surprised. I saw
what looked like a planet with handles! The handles were actually
the brilliant ring system that orbits the planet.
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Until 2006, Pluto was considered a ninth planet. But Pluto is
different from the eight planets in several ways. Now scientists
refer to Pluto as a dwarf planet. A dwarf planet is a small, ball-
shaped object that revolves around the Sun.
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Quiz Time! Lets see how you do locating the planet!
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JupiterNeptune The farthest planet you can see without a
telescope. Find the planet Uranus
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Oh no! Quick guess again!
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Great Job Kids!
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JupiterNeptune The largest planet in our solar system. Find the
planet Saturn
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Oh no! Quick guess again!
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Great Job Kids!
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JupiterNeptune The smallest planet of all the gas giants. Find
the planet Saturn
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Oh no! Quick guess again!
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Great Job Kids!
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JupiterNeptune This Planet has a weather system called the
Great Red Spot. Find the planet Saturn
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Oh no! Quick guess again!
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Great Job Kids!
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JupiterUranus This Planet rotates on its side. Find the planet
Saturn