Astronomers have discovered a planetary system that appears to flip one of astronomy's most reliable rules on its head.

Here's what to know about the brief tenure of our solar system's smallest planet.

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky ...

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.

It's a giant leap for mankind, as astronomers have discovered what they believe is a potentially habitable second Earth. The new planet they have found is 146 light-years away orbiting a sun-like star ...

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

Astronomers say a newly discovered solar system about 116 light years from Earth is challenging long held ideas about how planets form.According to CNN, researchers using telescopes from NASA ...

The planets around a nearby star seem to be in the wrong order, hinting that they formed through a different mechanism than the familiar one by which most systems grow ...