Space
Read space related news with special emphasis on NASA, cosmos, satellites and universe
What Is a Supernova, and How Does It Happen?
A supernova is a single star exploding with the light of a hundred billion suns, and it is one of the reasons you exist. Here is what a supernova is, the two very different ways stars blow up, and why these blasts built the world around you.
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 Nebula, and How Do Stars Form in One?
Nebulae are the vivid clouds of gas and dust behind some of the most famous images in astronomy, and they are where stars are born and die. Here is what a nebula actually is, the main types, and how new stars form inside them.
What Is the Big Bang, and What Does It Explain?
The Big Bang is the leading explanation for how everything began, yet it is one of the most misunderstood ideas in science. It was not an explosion in empty space. Here is what the Big Bang actually is, and the evidence that supports it.
What Is a Comet, and What Is It Made Of?
A comet can appear from nowhere, hang in the sky for weeks with a glowing tail, and then vanish for a thousand years. These icy wanderers are leftovers from the birth of the solar system. Here is what a comet is and how it works.
What Causes the Seasons? It Is Not Distance
Most people assume summer comes when Earth is closest to the Sun. It is a reasonable guess, and it is completely wrong. The real reason we have seasons is a gentle tilt, and once you see it, the whole calendar makes sense. Here is what actually causes the seasons.
What Is a Solar Eclipse, and How Does It Happen?
For a few minutes, the Moon slides in front of the Sun and turns day into an eerie twilight. A solar eclipse is a cosmic coincidence of size and distance, and one of the few celestial events you can watch with your own eyes. Here is how it works.
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.