Asteroid diversity points to a "snow globe" solar system by The Watcher on January 31, 2014, Jupiter's migration through the solar system has swept asteroids out of stable orbits, sending them careening into one another. As the gas giant planets migrated, they stirred the contents of the solar system. Objects from as close to the Sun as Mercury, and as far out as Neptune, all collected in the main asteroid belt, leading to the diverse composition we see today. Credit: David A. Aguilar (CfA)
A planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto, according to new research. Too distant to be easily spotted by Earth-based telescopes, the unseen planet could be gravitationally tugging on small icy objects past Neptune, helping explain the mystery of those objects' peculiar orbits. The claim comes from Rodney Gomes, a noted astronomer at the National Observatory of Brazil in Rio de Janeiro.
15 Things You Didn’t Know About Outer Space... (Fact 5 is wrong: According to the picture, yes, Jupiter is the second largest planet, and Saturn’s density is the lightest in the entire solar system, however, the planet itself is only lighter than Jupiter and Neptune, making Saturn the 3rd heaviest planet in the solar system)
This artist's concept illustrates the preferred model for explaining ALMA observations of Beta Pictoris. At the outer fringes of the system, the gravitational influence of a hypothetical giant planet (bottom left) captures comets into a dense, massive swarm (right) where frequent collisions occur.