Largest planets likely formed first from icy “planetary pebbles” From Astronomy Now: This artist’s concept of a young star system shows gas giants forming first, while the gas nebula is present. Southwest Research Institute scientists used computer simulations to nail down how Jupiter and Saturn evolved in our own solar system. These new calculations show that the cores of gas giants likely formed by gradually accumulating a population of planetary pebbles — icy objects about a foot (30…

Largest planets likely formed first from icy “planetary pebbles” From Astronomy Now: This artist’s concept of a young star system shows gas giants forming first, while the gas nebula is present. Southwest Research Institute scientists used computer simulations to nail down how Jupiter and Saturn evolved in our own solar system. These new calculations show that the cores of gas giants likely formed by gradually accumulating a population of planetary pebbles — icy objects about a foot (30…

Taken by Prosper Henry, 1885.  This photograph of the Ring Nebula in the constellation Lyra shows but a three-degree section of the firmament, 1,956 light-years from earth. Once a star similar to our own sun, the nebula was formed when the star exploded, releasing gasses from its outer shell into space.

Taken by Prosper Henry, 1885. This photograph of the Ring Nebula in the constellation Lyra shows but a three-degree section of the firmament, 1,956 light-years from earth. Once a star similar to our own sun, the nebula was formed when the star exploded, releasing gasses from its outer shell into space.

Jupiter, if it were as close as the moon  Wow, that would be strange. But cool!

Jupiter, if it were as close as the moon Wow, that would be strange. But cool!

#Space: #Mercury, the smallest planet, is getting even smaller, scientists say ►http://bit.ly/1kWsPtF via @Natalie Jost Jost Brewer and via @Maxime Dehaye Duprez pic.twitter.com/qzNY0Bni7A

#Space: #Mercury, the smallest planet, is getting even smaller, scientists say ►http://bit.ly/1kWsPtF via @Natalie Jost Jost Brewer and via @Maxime Dehaye Duprez pic.twitter.com/qzNY0Bni7A

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