Solar System Likely Once Had Another Gas-Giant Planet: Scientific American Podcast
Jupiter, Saturn, Uranus and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth?
Maybe so, says a new study by David Nesvorny of the Southwest Research Institute in Boulder, Colorado. He used computer simulations to explore what the solar system may have looked like some four billion years ago.
Click Mouse On Link Below Title To See More...