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

F = ma One of the most fundamental equations in physics, Newton’s Second Law of Motion, was formulated by Sir Isaac Newton in ...

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

Dust off your old telescope on a clear night and look up. If you find Jupiter, you’ll likely see four small dots to the side ...

Mars has fascinated humanity since Galileo Galilei accurately observed it more than 400 years ago. Now we’re getting to the ...

I pick out North America’s celestial highlights for the week ahead (which also applies to northern hemisphere mid-northern ...

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

Musician Megan Thee Stallion turns 30 and actor Natalie Morales turns 40, among the famous birthdays for Feb. 15.

In 1616, astronomer Galileo Galilei met with a Roman Inquisition official, Cardinal Robert Bellarmine, who ordered him to abandon the “heretical” concept of heliocentrism, which held that the earth re ...