Visualizing the solar system in its totality requires one to conjure a lot of spinning bodies moving in synchrony. But getting a sense of those objects’ scale is just as important for developing a ...

Our moon is not the biggest moon in the solar system — not by a long shot. In fact, the Moon is only the fifth biggest satellite in our solar system, wedged right between Io and Europa in size. The ...

A new virtual reality app lets users explore the solar system up close, from scorching-hot Mercury to faraway Pluto and beyond. The app, called Star Chart for VR, is billed as the first virtual ...

The seven worlds of TRAPPIST-1 are the most intriguing exoplanetary system discovered so far. What are these planets like, and could they support life? When you purchase through links on our site, we ...

NASA’s Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system. The planets, called Kepler-20e and Kepler-20f, are too close to their star to be in ...

Stellar-mass black holes, formed from collapsing stars, range from a few to several dozen solar masses, with the smallest known having a radius of approximately 10 miles. Intermediate-mass black holes ...