In 2009, NASA launched the Kepler space telescope (which has been de-activated in 2018); its mission was to detect the changes in the brightness of distant stars 3,000 light-years away from us. Freeman narrates (that as of 2011) around 300 Earth-like rocky planets orbiting distant non-Sun stars have been discovered by the Kepler Space Telescope. <br />Sara Seager and William Bains have been studying the exoplanet GJ 1214b, a planet more than 40 light-years away, twice the size of the Earth, and signs of an atmosphere. <br />Gliese 581d is about 20 light-years away from Earth in the constellation Libra; this planet might harbor "alien life." Its red star Gliese 581 generates half the heat of Earth's Sun. <br /><br />In 2008, NASA's EPOXI probe sent back images of Earth as our planets would appear to undiscovered alien astronomers. An astro-comb used to reduce "camera shake" to better see planets and stars many light-years away from the Earth. <br /><br />Thanks for watching. Follow for more videos. <br />#cosmosspacescience <br />#throughthewormhole <br />#season2 <br />#episode9 <br />#cosmology <br />#astronomy <br />#spacetime <br />#spacescience <br />#space <br />#nasa <br />#spacedocumentary <br />#morganfreeman <br />#aliens <br />#whatdoalienslooklike <br />
