Is there only life on earth?

Answer 1

Earth is the only place known to harbor life. However, scientists have estimated that there are between 100 and 400 billion planets in the galaxy orbiting other stars. Some of these could potentially harbor life, but it would be difficult to find evidence of life since we can never go to them. Some scientists suspect life might exist beneath the surfaces of Europa and Enceladus, icy moons orbiting Jupiter and Saturn and that life may have once existed on Mars, but again there is no direct evidence.