NASA Discovers Earth’s ‘Bigger, Older Cousin’ kit Posted on July 23, 2015 Posted in Aggregated No Comments Tagged with Science & Technology Since 2009, 12 planets less than twice the size of Earth have been discovered in the habitable zones of their stars. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email