What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for being a planet, putting Pluto into the new category of dwarf planet ...

The space economy stock is going through major ups and downs along with the rest of the industry.

Three planets, two stars and one moon create a spectacular June sky show.

Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

Will Marshall, Co Founder and Chief Executive Officer of Planet Labs, discusses AI's need for real world data, Earth ...