The moon is circling a point about 3,000 miles from our planet's center, just below its surface. Earth is wobbling around that point, too, making its own circles. That spot is the Earth-moon ...

McCarthy's moon libration video animation offers a stunning look at how the moon changes over time from month to month in its orbit. On average, the distance from the Earth to the moon is about ...

So, if the moon is super close to Earth and they are in circular orbits around a common center of mass, then they would make a complete orbit in only 2.3 hours (instead of 28 days).

At its fastest, Gateway will orbit the Moon at nearly 2 miles (3.2 kilometers) per second. Early on, the station will have enough space to accommodate four astronauts at a time.

The Odysseus lunar lander fired its main engine for six minutes and 48 seconds Wednesday, putting the spacecraft into a 57-mile-high orbit around the moon and setting the stage for a landing try ...