Astrophysicists have once again enriched our knowledge of the cosmos with a new discovery: two small planets orbiting ...

In 2015, two astronomers from Caltech presented evidence that six objects past the orbit of Neptune were bunched together in a way that suggested they were being "herded" by something with a large ...

LTT 9779 b, an ultra-hot Neptune, is defying expectations. With temperatures soaring to nearly 2,000°C and a tidally locked ...

Neptune sets around 8:25 p.m. and Venus sets ... The new definition requires that a planet: orbit the sun is large enough to be round has cleared its orbit of other small bodies.

According to NASA, multi-planet lineups are visible "every few years," but a seven-planet alignment is particularly uncommon, as each planet's orbit varies, with some moving more quickly and Mercury, ...

A Neptune-sized planet, TOI-3261 b, makes a scorchingly close orbit around its host star. Only the fourth object of its kind ever found, the planet could reveal clues as to how planets such as ...

The planet Neptune wobbled in its orbit around the Sun. That could only mean one thing, astronomers said: There was a ninth planet out there, somewhere, lurking in the fringes of the solar system.

Neptune sets around 8:25 p.m. and Venus sets ... "A dwarf planet is an object in orbit around the Sun that is large enough to pull itself into a nearly round shape but has not been able to clear ...