A 15-Jupiter-mass object circling a star about 133 light-years away has given astronomers their clearest chemical evidence yet that massive worlds and the smallest stars are built in fundamentally ...

Planets, like those in our solar system, form in a bottom-up process where small bits of rock and ice clump together and grow larger over time. But the heftier the planet, the harder it is to explain ...

The NASA administrator’s latest remarks in support of reexamining Pluto’s status come 20 years after the orb was downgraded to a dwarf planet by the International Astronomical Union ...

It's been 20 years since Pluto lost its status as the ninth planet of the solar system, but we still can't seem to let it go. Reading time 3 minutes Pluto remains one of the great generational divides ...

Many of us are old enough to have grown up with the idea of nine planets orbiting the Sun. In 2006, however, a controversial decision in the astronomy community resulted in the official list being cut ...