Ever since discovery of new solar system several weeks ago, scientists have been discussing whether planets in system could contain life. Scientists called system "TRAPPIST-1". It contains small sun and seven Earth-sized planets. It is very similar to our own solar system. NASA scientist Michael Gillon said three of seven TRAPPIST-1 planets receive as much heat from its sun as Venus, Earth and Mars receive from our Sun. He said this provides right environment for life to exist. TRAPPIST-1 is in star system called Aquarius. It is nearly 40 light-years away from Earth. Its sun is smaller than our Sun and has just 1/1000th of its brightness, but that could be enough to support life.
Michael Gillon explained that you could see other six planets in sky if you were on one of TRAPPIST-1 planets. neighbouring planet could look bigger than our view of our Moon. Mr Gillon said: "If you were on surface of one of these planets, you would have wonderful view of other planets. You wouldn't see them like we see Venus or Mars, like dots of light. You would see them really as we see the Moon. You would see structures on these worlds." Astronomer Dr Jessie Christiansen said life exists everywhere, "such as bacteria that survives in 130-degree caves, or things at bottom of ocean where there's no light". She said it could be possible for life to exist on some of these planets.