Explore Planets
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Do you know what a planet is? Guess what... astronomers are not quite sure what a planet is! ...
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![](/images/icons/systemplanet_mercury.jpg)
Mercury, the planet nearest the Sun, is the second smallest planet in the solar system. Only ...
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![](/images/icons/systemplanet_venus.jpg)
Fair but inhospitable Venus, a "Sister" planet to the Earth that is very different from our ...
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![](/images/icons/systemplanet_earth.jpg)
Earth, our home planet, is a beautiful blue and white ball when seen from space. ...
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![](/images/icons/systemplanet_mars.jpg)
Mars, Earth's outer neighbor, is the fourth planet from the Sun. Mars' bright appearance and ...
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![](/images/icons/systemplanet_jupiter.jpg)
Jupiter is the largest planet in the solar system. When approached from afar, its fantastic ...
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![](/images/icons/systemplanet_saturn.jpg)
Saturn, the sixth planet from the Sun, has the most spectacular set of rings in the solar system. ...
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![](/images/icons/systemplanet_uranus.jpg)
Uranus, the seventh planet from the Sun, has its spin axis almost in the plane of its orbit ...
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![](/images/icons/systemplanet_neptune.jpg)
Neptune, the eighth and furthest planet from the Sun, is a very cold place. Its bluish color ...
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![](/images/icons/systemplanet_pluto.jpg)
In 2006 the International Astronomical Union (IAU) approved a new classification scheme for ...
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Did you know?
Did you know that Uranus is
tilted so that its rotational axis is almost in the plane of the ecliptic?
Do you know how Neptune was discovered?
Earth and Space Science Concept of the Day
Do you know what this word or phrase means?
TidexTide : A tide is the regular rising and falling of the ocean's surface caused by the gravitational pull of the Moon and the Sun on the ocean and the Earth's rotation.
Click on the word to find out!
Research Highlights
Air pollution can get high in the atmosphere – high above most of the clouds you see in the sky. Scientists are finding air pollution more than 20 miles above the surface of the Earth. That’s in the stratosphere...
Read more![](/olpa/images/pollution1_h.jpg)