Mars orbits at an average distance of 142 million miles (228 million km) from the sun. Its orbit is about 1.5 times the size of Earth's. Sunlight takes about 13 minutes to get to Mars, while it ...

Mars is about 140 million miles from our cozy planet. A human mission to that cold, rocky neighbor would mean being away from Earth for about 3 years. But the things those explorers would see and ...