Since the discovery of the TRAPPIST-1 solar system, scientists have been discussing whether the planets in it could contain life. TRAPPIST-1 contains a small sun and seven Earth-sized planets, similar to our own solar system. NASA scientist Michael Gillon said three of the planets get as much heat from its sun as Earth gets from our Sun. He said this provides the right environment for life to exist. TRAPPIST-1 is in a star system called Aquarius nearly 40 light-years away from Earth. Its sun is smaller and less bright than our Sun, but could support life.

Michael Gillon said: "If you were on the surface of one of these planets, you would have a wonderful view of the 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 the structures on these worlds." Scientist Dr Jessie Christiansen said life can live anywhere. She said bacteria can survive in caves that are 130-degrees centigrade and things can live at the bottom of the ocean where there is no light. She said it is possible for there to be life on some of the TRAPPIST-1 planets.