While planets circle the sun in what's called and heliocentric orbit, they rarely fall together in what appears to the human ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

Heads up! Four planets are visible in the evening sky this month, and another two planets can be found with a little help.

How far away is Mars? To determine how long it will take to reach Mars, we must first know the distance between the two planets. You may like The best (and worst) Mars landings of all time What ...

Later in the month, anyone with a clear, unobstructed view of the horizon may be able to see all five bright planets stretching across the sky. Two of these planets, Mercury and Saturn ...