The line that these planets are on is called the ecliptic, which represents the plane of the solar system in which the ...

Over a thousand objects are now known to orbit the Sun beyond Neptune, and once again we can't imagine torturing school children by adding even a dozen of the biggest ones to the list of planets.

Earth-like exoplanets (planets orbiting stars other than our sun) with oceans, lakes and rivers are thought to be unlikely, but the work reveals that many stars will harbor geological conditions ...

A planet parade is when several of our solar system's planets are visible in the night sky at the same time. There will be six planets visible this time around, including Venus, Mars ...

A "domino effect" may occur in star systems whereby newly formed planets close to a star help ... [+] shepherd dust and gas to create more planets farther out in the system. Astronomers using a ...

All the planets revolve around it on roughly the same plane, and they also move in the same direction. Even so, there are slight anomalies in the architecture of our stellar neighborhood that can ...

This solar system consists of four inner rocky planets and four outer gas giant planets as well as an asteroid belt, containing thousands of huge rocks, dwarf planets and comets. Our solar system ...

The best telescopes for seeing planets give you the clearest views of ... telescopes has the most versatile choices. See our quick list below if you want to dive right in, or scroll further ...