Mercury takes only 88 Earth days to orbit the sun.

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Saturn may be difficult to see since it will be near the sun, according to StarWalk. It's not especially remarkable for a few ...

The planetary parade is a celestial event that happens fairly often. However, not usually on this scale. It refers to more than four planets orbiting around the sun visible on one side of the sun at ...

Mars is in opposition through the entire month of January, meaning it will be directly opposite the Sun from Earth and will shine brightly all night. The planets will appear at their closest this ...

"Chemical rockets that we use today, even with the extra speed boost from flying by planets, or from swinging by the sun for ...

(Note: The objects on the magnitude scale show what we can see at different magnitudes ... in a straight line from our perspective. That is because the planets orbit the sun in an ecliptic plane. This ...

A planet that may support alien life has been discovered less than 20 light-years from Earth. The "promising" super-Earth - ...

(Note: The objects on the magnitude scale show what we can see at different ... That is because the planets orbit the sun in an ecliptic plane. This illustration is from a northern hemisphere ...