When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Alien planets that orbit close to their parent stars may be at high risk of the ultimate hot-cold ...

Mercury's spin and its orbit around the Sun are tied to each other in a unique arrangement. According to a set of calculations, random asteroid impacts may have aided the planet's evolution into the ...

A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km (26,200 miles). In the special case of ...

Have you ever wondered why we only see one side of the moon when we look at it from Earth? We would expect to see the other side of the moon because it is a rotating sphere, but this is not the case.