Solar System Astronomy
All contributors in Solar System Astronomy
Learn more about the thousands of miniature planets called asteroids that orbit the sun. more...
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. more...
Spring begins in the Northern Hemisphere as Earth's Noth Pole tilts sunward. more...
What is the solar cycle and how long does it last? What are the effects of the sun's changing cycle? more...
An asteroid approximately 60 meters in diameter has a 1-in-25 chance of smashing into Mars on January 30, 2008. more...
The astronomical beginning of the winter season is signaled by Earth's tilt and the amount of sunlight received in the Northern Hemisphere. more...
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. more...
All feature articles in Solar System Astronomy
Comet Enke – A Threat To Earth?
By: Tabitha Davies
Is Comet Enke and the Taurid Meteor Shower that caused the Tunguska Event in 1908 on an inevitable second collision course with Earth? more...
By:
Paul A. Heckert
Saturn has a well known easily observed spectacular ring system. The other Jovian planets, Uranus, Jupiter, and Neptune, also have ring systems. more...
By:
Paul A. Heckert
Saturn has the most extensive and beautiful ring system of any planet in the solar system. more...
By:
Paul A. Heckert
A little larger than the planet Mercury, Saturn's largest moon, Titan, has a significant nitrogen atmosphere but is cold enough for lakes of liquid methane. more...
By: Cyrus Dehkan
Olympus Mons, Valles Marineris and the face on Mars are a few of the natural wonders that have been discovered on Mars. more...
Extraterrestrial Life on Europa
By:
Paul A. Heckert
Beneath an icy crust, Jupiter's moon Europa may have extensive oceans of water that rival Earth's. Did life develop there? more...
By:
Paul A. Heckert
What are the properties of Jupiter's four largest Moons, the Galilean Moons: Io, Europa, Ganymede, and Callisto? more...
All contributing articles in Solar System Astronomy