"A three-body problem is extremely complicated. Now we're dealing with four: the sun, Earth, the moon and Mars. The heavy ...

Later in December, the 3I/ATLAS interstellar comet will get as close to Earth as it ever will. Here's what to know.

Make sure your angles are in units of radians (not degrees), where 2π radians = 360 degrees. But after that you will get the ...

The sun's gravity will pull the moon farther away from Earth than it's been in over five years on Nov. 19, though it'll be ...

A clear look at the discovery of 40,000 near-Earth asteroids, how scientists track them, and the missions working to keep our ...

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

The Moon is getting 1½ inches (3.8 centimeters) farther away from the Earth every year. Scientists measure the distance to ...

Gravity and motion make time pass faster on Mars than Earth, reshaping navigation, communication, and future crewed missions.

Stargazers will get a feast for the eyes this evening as a spectacular supermoon lights up the sky. Dubbed the Cold Moon, it ...

I nterstellar comet 3I/ATLAS will make its closest approach to Earth this month, whizzing by at 270 million kilometers (168 ...

This means that it would still take a little over four whole years of traveling at lightspeed to reach the red dwarf—not that ...

Though the exact length of a "stadia" is unknown, his measurement is thought to be accurate to within one percent of the ...