Two planets as big as Earth ‘could be on edge of solar system’

This article is from the source 'guardian' and was first published or seen on January 18, 2015 20:54 (UTC). It last changed over 40 days ago and won't be checked again for changes.

You can find the current article at its original source at http://www.theguardian.com/science/2015/jan/18/two-undiscovered-planets-earth-solar-system

The article has changed 1 times. There is an RSS feed of changes available.