Astronauts returning from long-duration missions aboard the International Space Station carry back more than scientific data. They come home with swollen optic discs, weakened hip bones, and redistributed bodily fluids that can take months or longer to resolve.

Over the past eight days, the world has watched four intrepid explorers leave Earth, fly around the Moon, and make spaceflight history. The moments of reverence, camaraderie, and bravery we’ve witnessed since the launch of NASA’s Artemis 2 mission have done wonders for my faith in humanity, but sadly, all good things must come to an end.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: Earth’s gravity keeps us securely on terra firma—it’s ubiquitous and inescapable. But it’s also ...

When the Moon first formed, it was a sea of molten lava. The immense gravity of Earth stretched this molten sea, raising tides on both the near and far sides. But the Moon was spinning, and that rotation carried the tides away from a direct line pointing ...