ED138, a newly discovered dwarf planet candidate, could join a group of only five other recognized objects that includes our ...

Add Yahoo as a preferred source to see more of our stories on Google. A view of a world with tan shades and a reddish area toward the bottom left of it. In August of 2006, astronomers at the ...

Astronomers now estimate there is at least one planet for every star in our galaxy. These worlds, called exoplanets, are planets that orbit stars outside our solar system. But new research from ...

Astronomers know that planets can exist in double – or binary – star systems, where two stars orbit each other. Typically, the planets orbit either one of the stars or loop around both in a larger ...

Planets may begin forming much earlier than scientists once believed during the final stages of a star s birth, not afterward. This bold new model, backed by simulations from researchers at SwRI, ...

As telescopes have become more powerful, it’s turned out our solar system is not the only game in town: There are millions of other planets out there in the galaxy. But we’re still teasing out clues ...

Planets larger than Earth but smaller than Neptune are the most common kind in the galaxy, but because our solar system lacks such a planet, scientists don’t know much about how they form. Astronomers ...

In August of 2006, astronomers at the International Astronomical Union (IAU) democratically voted to reclassify Pluto as a dwarf planet — but 20 years later, with our greater knowledge and ...