A California startup wants to bounce sunlight from orbit onto Earth after dark, and the idea is stirring up serious debate.

We’re living through something truly special right now. While most of us go about our daily routines, scientists, engineers, ...

Astronomers found an iron bar in the Ring Nebula that doesn't match any known stellar phenomenon. Scientists can't explain ...

One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, ...

"It's like watching a cosmic volcano erupt again after ages of calm — except this one is big enough to carve out structures ...

Four of the planets, which are Mercury, Venus, Jupiter and Saturn, are bright enough to be spotted with the naked eye in ...

The James Webb Space Telescope has delivered its clearest view yet of a supermassive black hole's immediate surroundings, ...

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

I have been writing about the Giant Magellan Telescope for a long time. Nearly two decades ago, for example, I wrote that ...

The Ring Nebula, a stunning celestial structure residing in our neighborhood of the Milky Way galaxy, was discovered by ...

The James Webb Space Telescope snapped its sharpest image of the area around a black hole, solving a long-standing galactic ...