Finding intelligent creatures outside the earth has always been a tireless job for people. If "aliens" do exist, the planet they live in should have roughly the same environment as our planet. Scientists have basically reached a consensus on this, and they are working hard at Look for "Second Earth" outside the solar system, also known as terrestrial planets. The conclusion that cannot be drawn from this text is. ['Aliens are intelligent creatures outside the earth.', 'The planet inhabited by aliens is a terrestrial planet.', 'Scientists think aliens exist.', '"Second Earth" may exist outside the solar system.']