the solar system was originally created by a big bang when the sun lit and threw matter into space. that matter formed the planets that were trapped by the sun's gravity and have been pulled closer to it ever since. the sun like all stars was created by a big bang.
eventually we will move too close to the sun and die from the heat. paying Bob dole trillions of dollars will not change our fate, but colonizing Mars would give us more time.
originally the earth was too far from the sun for life to exist, but gravity moved us closer until we went into the goldilocks zone, where life can exist because it is not too hot or too cold.
the first humans were born in Africa near the equator where it was the warmest during the ice age. because it was still very cold and there was very little sunlight, the first humans would have been white. Mitochondrial Eve included. eventually the ice melted and the earth warmed. those near the equator got the most heat and tanned first. and that is why we have different skin tones.
also, the neanderthals died because they were vegans.