Solar System Astronomy
Latest Feature Articles
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Mars's Moons Phobos and Deimos
Phobos and Deimos are Mars's two small moons that were once asteroids.
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New Moon and Eclipse
New Moon and Eclipse are more than just books by Stephenie Meyer and a hit movie series.
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10 Facts About Mars
Learn interesting tidbits about Mars, the fourth planet from the Sun.
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Lightning Storms on Saturn
The Ringed Planet hosts lightnings storms that can last for months on end.
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Tropical Storms on Titan
Astronomers were surprised to find that Saturn's dry moon has large-scale atmospheric turbulence where none was expected.
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Jupiter Hit by Comet or Asteroid
An amateur astronomer reports first sighting of new impact evidence on the solar system's largest planet.
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Weather and Seasons on Titan
Saturn's largest moon has a substantial atmosphere that experiences seasonal change.
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Weather on Other Planets
The solar system is a stormy place with dust devils, sulfuric acid rains, and screaming winds.
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Facts About Meteors
Meteors are sudden streaks of light in the sky that can happen during predicted showers or at random.
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New Member of the Solar System Discovered
The new solar system object named 2006 SQ372 is spotted on its 22,500-year-long orbit around the sun.
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Makemake: The Fourth Dwarf Planet
Makemake is a Pluto-like object lying in our solar system beyond Neptune's orbit.
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Ice Found on Mars
NASA's Phoenix Lander seems to have fulfilled one of its main missions: finding signs of water on Mars.
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The First Day of Summer
The Northern Hemisphere welcomes the first day of summer on June 20 or June 21 depending on your location.
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Climate Change on Jupiter
Understanding temperature change on our solar system's largest gas giant planet.
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New Storms Spotted on Jupiter
Storms are firing up in Jupiter's atmosphere, with new areas of turbulence popping up near the Great Red Spot.
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Facts About Asteroids
Learn more about the thousands of miniature planets called asteroids that orbit the sun.
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First Ring Found Around a Moon
The first lunar ring has been found around a moon of the planet best known for its rings: Saturn.
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The First Day of Spring
Spring begins in the Northern Hemisphere as Earth's Noth Pole tilts sunward.
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Understanding the Solar Cycle
What is the solar cycle and how long does it last? What are the effects of the sun's changing cycle?
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Asteroid Might Hit Mars
An asteroid approximately 60 meters in diameter has a 1-in-25 chance of smashing into Mars on January 30, 2008.
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First Day of Winter
The astronomical beginning of the winter season is signaled by Earth's tilt and the amount of sunlight received in the Northern Hemisphere.
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Comet Holmes Now Larger than Sun
Comet Holmes is now greater than the size of the sun and continues to be easy to spot in the night sky.
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Facts about Earth
Earth is remarkable because it is currently the only planet we know in the entire universe to harbor life.
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Peru Meteor Mystery
A rock from space has reportedly carved a crater into mud in southeastern Peru, releasing a gas that has caused many people to feel ill.
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First Day of Fall
The astronomical start of the fall season is marked by the positions of Earth and the sun.
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