The Kepler-51 system, known for having some of the least dense planets ever found, has a fourth member. We don’t know if the ...

concentrated on understanding the intricate dynamics leading to the reduction in size of specific sub-Neptune planets. Christiansen's team suggested a compelling link between the cores of select ...

In 1992 astronomers reported the first planet-size masses around a dead star, the pulsar PSR1257+12, which sits 2,000 light-years away. Three years later came news of the first known exoplanet ...

Small in comparison to the gas planets found further from the Sun, they also rotate at a more sedate pace and have few moons… The four rocky planets are Mercury, Venus, Earth and Mars.

Astronomers have discovered an Earth-size planet that is showered with so much radiation, its atmosphere eroded away long ago ...

Scientists have found two new habitable planets, nearly 8 times the size of Earth, that don’t orbit a ‘Goldilocks’ star. These are the closest candidates to Earth to support human life on ...

"Asteroids are 'bits of a planet that didn't happen' that orbit the sun between Mars and Jupiter in the main asteroid belt," astronomer Jay Tate said.