(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion ...

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. The four planets, each only about 20 ...

A recent astronomical discovery has shaken long-held beliefs about how planets form. For decades, scientists thought that stars much smaller than our Sun couldn't form giant planets. That theory just ...

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Astronomers announced Wednesday they have discovered a massive planet orbiting a tiny star, a bizarre pairing that has stumped scientists. Most of the stars across the Milky Way are small red dwarfs ...

When Galileo pointed his telescope at Saturn and Jupiter, he had just discovered the nature of two giant planets. Later came Uranus and Neptune, two more gas giants. Since then, astronomers have ...