Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

The sun has had quite a busy week hurling solar flares at our planet, causing blackouts across the globe. “After weeks of ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million years. Uranus and Neptune were next, within 10 million years. The inner ...

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times bigger than Earth and has an orbit wildly different from ...

At the center is the sun, a yellow dwarf star ... from the eight major planets to dwarf planets, comets, asteroids, and icy objects — revolves around it. The solar system also includes the ...

A breathtaking new video compresses more than a decade of deep-space observation into a few seconds, revealing the hypnotic ...

WD 1856+534b—a freezing world with a surface temperature of -125 degrees Fahrenheit—exists where planets are normally scoured ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

The candidate for Planet Nine displayed a tiny amount of movement, which could mean it advanced further in its orbit around the sun. Some of the strongest evidence that points to the existence of ...

Plato, the European Space Agency's terrestrial planet hunter spacecraft, is seen after having 24 of its 26 cameras installed.