Our Solar System is home to eight extraordinary planets, each with its own unique features, mysteries, and beauty. This cosmic journey takes you from the Sun-scorched surface of Mercury to the icy ...

The smallest planet in our solar system is Mercury. The planet is about 1/3 of the width of Earth with a radius of 1,516 miles. Earth’s moon has a radius of just over 1,000 miles.

An alien planet discovered around a star in the Alpha Centauri system, the nearest to our own sun, has astronomers buzzing, and not just because it's the closest exoplanet to Earth ever seen.The ...

This planet has the smallest mass -- a measurement of weight that doesn't include gravity -- that has been found outside our solar system so far. With a mass of about 1.1 times the size of Earth ...

Scientists have discovered over 4,000 exoplanets outside of our Solar System, according to NASA’s Exoplanet Archive. Some of these planets orbit multiple stars at the same time. Certain planets ...

Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...

If a PBH found its way into our solar system, that black hole would orbit the sun like a planet would, and it would tug on dwarf planets and asteroids just like the theoretical Planet 9 would.

In our solar system, small, rocky worlds orbit close to the sun and large, gaseous worlds orbit farther out. In comparison, the planets of Kepler-20 are organized in alternating size: large, small ...

Astronomers using telescopes in Hawaii, California and Texas have found the first Neptune-size planets outside our solar system, far smaller than any planets previously detected. One of them is ...

Earth-Size Planet Closest to Our Solar System: By The Numbers. News. By Tariq Malik published 17 October 2012 When you purchase through links on our site, we may earn an affiliate commission.

First 'Earth-Size Planets Beyond Our Solar System' Discovered : The Two-Way Though scientists don't think the planets could sustain life, they say their discovery is significant because it shows ...