Astronomers have discovered not one, but four tiny planets orbiting Barnard’s Star, our cosmic neighbor. These planets, each ...

Because stars are so much brighter than their planets, it's easier to look for effects that planets have on their stars—like ...

Astronomers have revealed new evidence that there are not just one but four tiny planets circling around Barnard's Star, the second-nearest star system to Earth.

Astronomers have revealed new evidence that there are not just one but four tiny planets circling around Barnard's Star, the ...

President Donald Trump told lawmakers that U.S. astronauts will one day carry the American flag to Mars and beyond during a speech before the joint session of Congress late Tuesday (March 5).

Seven planets are aligning in the night sky this week, creating a brief chance to see a "planetary parade." Worldwide, the best day to see the alignment is today, Feb. 28. Mercury, Venus ...