The presence of an ocean leaves open the possibility that it could host life. Another nearby moon, Europa, is also considered ...

Callisto, the third largest moon in the entire solar system, orbits Jupiter from about 1.2 million miles away. The rocky ...

Every year on February 19 scientists across the world celebrate Copernicus Day. Learn about the man who changed how we view ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

Mathematical equations have been the greatest tool to explain the world around us and the key to advance our knowledge about ...