The cause of this less habitable Earth would have been due to the changes that a planet between Mars and Jupiter would have had on the overall orbit of the planets within our solar system.

That’s because Jupiter ... but are mainly big balls of hydrogen and helium. This is a photo of Meridium Planum, a plain on the surface of Mars. If you’re travelling to Mars anytime soon ...

There are eight planets in our solar system. The closest one to the sun is Mercury, then it’s Venus, Earth, Mars, Jupiter ... It is a huge ball of burning gas made mostly of hydrogen.

"It's like a game of billiards around the solar system ... we need to get to Jupiter and Europa." Today (March 1), NASA's Europa Clipper spacecraft will fly past Mars, gliding just 550 miles ...