See the epic view of the moon and Earth captured by the Orion spacecraft ahead of its outbound powered flyby. Credit: NASA / ...

Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once a year, and it rotates on its axis about once a day (depending on your ...

Over time, it cooled and clumped into a single massive body—the moon. That impact didn’t just create a satellite; it helped define Earth’s structure, tilt, and rotation. Clues about this ...