How is it that galaxies merge and collide but the universe is expanding and everything is moving away from everything else? Justin HammersleySterling Heights, Michigan Whether or not galaxies merge ...

Here’s what you’ll learn when you read this story: The Milky Way supposedly lies in the immense Laniākea basin, but even that is now thought to be part of a bigger basin of (gravitational) attraction ...

Dark energy — a mysterious force pushing the universe apart at an ever-increasing rate — was discovered 26 years ago, and ever since, scientists have been searching for a new and exotic particle ...

When the densest objects in the universe collide and merge, the violence sets off ripples, in the form of gravitational waves ...

Travel to another moon or planet and your weight will change — but not your mass. This is because your weight on other worlds depends on the gravitational force of attraction between you and that ...

The study of black holes has long been at the forefront of gravitational physics, and recent advances have significantly enriched our understanding of these enigmatic objects within the framework of ...