When we think of a day, we usually imagine 24 hours. But did you know that not all planets have days that last 24 hours? In ...

Venus is often known as Earth’s twin because it is the closest planet to Earth in size, mass, and composition. Both are rocky ...

BepiColombo, a joint mission of the European Space Agency and the Japan Aerospace Exploration Agency, launched Oct. 20, 2018.

In the sweltering heat of Glendale, Arizona, where most folks are hunting for air-conditioned sanctuaries, there exists a treasure trove so vast and so affordable that it might just make you forget ...