Space Science
What Is Gravity, and How Does It Work?
Gravity holds you to the ground, keeps the Moon in orbit, and shapes entire galaxies, yet it is one of the strangest forces in nature. Here is what gravity is, how Newton and Einstein explained it, and why it rules the universe.
What Is a Galaxy, and How Many Are There?
A galaxy is a city of stars, held together by gravity and adrift in a universe that holds hundreds of billions more like it. Ours is just one. Here is what a galaxy actually is, and how astronomers count them.
What Is the International Space Station?
For more than two decades, humans have lived without a break aboard a laboratory the size of a football field, circling the planet every 90 minutes. Here is what the International Space Station is and why it exists.
What Is a Black Hole, and What’s Inside One?
A black hole is a place where gravity wins so completely that even light cannot leave. Here is what they are, how they form, and the honest answer to what lies inside.
Can You Hear Sound in Space?
In space, no one can hear you scream, and that tagline is basically correct. But NASA has released the ‘sound’ of a black hole, so what is actually going on?