Earth is percieved as a rocky planet, what are other planets like? Did you know Mars is cold and that outer planets are really gigantic gas envelopes? What about a liquid planet? Could such a planet ...

Dr. Rider-Stokes and his team’s findings indicate that both inner and outer solar system planets likely formed at almost the same time, around 4.564 billion years ago.

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

The place represents a kind of pause, a change in regime between the inner and outer solar system. Toward the sun, things are hotter, solid, smaller.

The rocky planets closest to the sun are made up of very different materials than the gas giants in the outer solar system. That's because billions of years ago, our baby solar system was divided ...

The planets, for instance, revolve in the same direction and in almost the same plane. The four inner ones (Mercury, Venus, Earth, Mars) are smaller and denser than the outer ones (Jupiter, Saturn ...

Even though the giant planets are extremely far from Mercury's orbit, their massive size more than makes up for their distance, and their motions trigger instabilities in the inner disk.

The outer ones were bigger and made mostly of gas. Disc material that did not get swept up into planets formed a belt of asteroids between the inner and outer quartets and a belt of small, icy ...

Press Release Inner Region of Young Star and its Planets Probed by SpaceRef April 20, 2015 ...