There's a whole slew of objects that astronomers aren't sure whether to classify as "failed stars" or "overgrown planets." ...

NASA’s Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system. The planets, called Kepler-20e and Kepler-20f, are too close to their star to be in ...

A NASA mission has spotted an Earth-size exoplanet orbiting a small star about 100 light-years away. The planet, named TOI 700 e, is likely rocky and 95% the size of our world. The celestial body is ...

Astronomers have discovered an Earth-size planet orbiting an ultracool red dwarf star similar in size to Jupiter. The red dwarf, located some 55 light-years away, is 100 times less bright than the sun ...

A Neptune-mass exoplanet, LHS 3154 b, orbiting a low-mass M dwarf star (11% solar mass) has been discovered, challenging previous assumptions about planet formation around such stars. The planet's ...

AMES, Iowa – Astronomers poring over four years of data from NASA’s Kepler spacecraft have discovered a star that’s 11.2 billion years old and has at least five Earth-size planets. “We thus show that ...

Scientists have discovered a planet ten times the size of Jupiter orbiting two stars, scrapping previous understandings over where a planet could exist. The findings were detailed in a new study ...