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

An alignment of seven planets will be visible in Friday's evening sky. Here's when and where to view the celestial phenomenon ...

You can expect to see seven planets align Friday when Mercury joins Mars, Jupiter, Uranus, Neptune, Venus and Saturn ... The planets orbit the sun continuously in the solar system, so at times ...

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

An alignment of seven planets will appear, whether by the naked eye or with the use of a telescope, this month in the U.S. Here's how to spot it.

The objects around the ringed planet are tiny, but some of them may have formed relatively recently in the solar system’s ...

According to NASA, multi-planet lineups are visible "every few years," but a seven-planet alignment is particularly uncommon, ...

Planets change orbit shape around Neptune’s size. Metal-rich stars help giant planets form. Eccentric orbits suggest chaotic planet formation.

The phenomenon known as a planetary parade is back as astronomers and stargazers prepare for what could be a dazzling display in the solar system, so if you missed January's, here's your chance.

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.

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.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...