Jupiter May Have Destroyed The Solar System's First Planets

It is becoming increasingly obvious that our Solar System — with its inner collection of small rocky planets and an outer region buffeted by gas planets — is quite uncommon. According to a remarkable new study, the reason may have to do with Jupiter and an ancient migratory journey that kickstarted the destruction of… » 3/24/15 8:00am Tuesday 8:00am

This crazy-dense planet could be of an entirely new type

When it comes to detecting and cataloguing exoplanets, astronomers have only just begun. It should come as no surprise, therefore, that an entirely new class of planets may have been discovered — Neptune-like planets that were stripped of their outer gaseous layers after venturing too close to their sun. » 3/14/13 11:20am 3/14/13 11:20am

Astronomers Say Super-Earths Are Actually Mini-Neptunes

Among the 860 exoplanets documented so far, a good portion of them are so-called super-Earths — planets that feature a mass greater than Earth's, but lower than our solar system's smaller gas giants, namely Uranus and Neptune (both of which are about 15 Earth masses). And as the name implies, some of these… » 2/05/13 8:00am 2/05/13 8:00am