Sophisticated life forms are relative newcomers on Earth compared to bacteria, having developed over the last 500 million years as opposed to billions of years of bacterial life. They arrived later because the Earth proved to be a healthy environment for life over the long term. Because the environment of other planets is more primitive, life on other planets may be primitive and unsophisticated, like early life on Earth. Link to the Exploratour on Life on Earth, at the bottom of this page, to learn more about that subject.

Here we present a look an the environments of some places in the solar system; Mercury, Venus, Mars present and past, Jupiter, Io, Europa, Saturn, Titan, other moons, Uranus, Neptune, Triton, Pluto, comets, and interstellar space. To continue with the tour press the forward link in the upper corner of this page.