So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully ...

All planets are made of gas, ice, rock and metal, and models of how planets form usually assume that these materials don't ...

The findings provide strong evidence that four giant exoplanets 130 light-years from Earth formed much like Jupiter and ...

Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...

Prior to 2040, the last planetary quintuplet occurred in the year 1186, and according to Uptain, records show that the close ...

Astronomers have confirmed the existence of four planets orbiting a star less than 6 light-years away with help from some of ...

Astrobiologist Joshua Sebree of the University of Northern Iowa suggests that South Dakota's Wind Cave exhibits chemical ...

Using the now-retired Kepler space telescope, astronomers have discovered that larger planets grow up in more turbulent homes ...

New research led by a York University professor sheds light on the earliest days of Earth's formation and potentially calls ...

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

Though the alignment isn't once-in-a-lifetime rare, the seven other planets in our solar system don't align every year, so it can be a spectacle to witness. Here's what to know about this weekend ...

The ecliptic is also the reason that we on Earth sometimes observe planets appearing to approach closely to each other in the sky "while they careen around the cosmic racetrack," according to NASA.