We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

An unusual x-ray signal from the Helix Nebula, first detected in 19180, could stem from a star destroying a nearby planet. Credit: NASA/CXC/A. Hobart ...

Very massive stars are cosmic "rock stars" that live fast, die young and leave black holes in their place. During this ...

A hundred years ago, astronomer Edwin Hubble revealed a universe of galaxies that existed beyond ours. His influence in astronomy continues to this day.

Astronomers are excited about the first test images released today from the Vera C. Rubin Observatory, which show the ...

Galaxies shine in a rainbow of emissions from gas, dust, and stars. Each of these building blocks emits light at specific ...

NASA has just released a new documentary about the most powerful space telescope ever built, and you can watch it now.

From sparkling galaxies to gargantuan nebulae spanning thousands of light years across, check out these 7 rare images of universe captured by NASA's James Webb Space Telescope.

There was, especially in the left ventricle, a most perfect spiral symmetry, one that rivaled the Great Andromeda Nebula.

A third category – nebulae with spiral structure – particularly intrigued astronomers. The Andromeda nebula, M31, was a prominent example. It’s visible to the naked eye from a dark site.