[悦毒]石悦拾好悦毒寂静+木寻云整理版已出（共52只，更新11/7-14:43）

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A new twist on an emerging theory says the sun was born amid massive, short-lived stars that sculpted our solar system with intense radiation and violent explosions that may have affected the origin of life.

The fresh analysis pulls together several lines of evidence suggesting that the sun did not form in isolation, as astronomers once thought. Instead, it emerged from the edge of a cloud of chaos not unlike three strikingly photogenic nebulas known as Eagle, Trifid and Orion.

Eventually the crowd of stars drifted apart and our young solar system wandered out to its rather lonely present location, more than 4 light-years from the next nearest star.

Theorists have speculated since the 1970s that the sun might have formed in a dense region of star birth. The latest evidence for a chaotic birthplace comes from meteorites that have landed on Earth after orbiting the sun for billions of years.

The rocks contain chemical patterns that can only be created by the radioactive decay of an isotope of iron called iron-60, said Arizona State University astronomer Jeff Hester, lead author of a paper explaining the idea in the May 21 issue of the journal Science. The iron-60 must have been present in the early solar system but has since decayed into telltale nickel-60 in the meteorites.

"There is no way that you can form iron-60 other than in a massive, evolved star," Hester told SPACE.com. And that implies the sun must have been near a massive star when it formed about 4.6 billion years ago.

The iron-60 discovery was made last year by Arizona State researchers Shogo Tachibana and Gary Huss. The finding supports other evidence for the sun having formed near a massive star, said Alan Boss, a planet-formation theorist at the Carnegie Institution of Washington, "With the advantage that iron-60 can only be created in a supernova and so there is no room for debate about where it formed."

Boss, who was not involved in Hester's effort, has developed a similar scenario for the sun's formation near massive stars, using their UV radiation to explain the presence of Uranus and Neptune, which by the old, standard model of planet formation should not exist. Boss said Hester's analysis "fits in beautifully" with his work.

Hester agreed, adding that "our new work addresses how stars find their way into such environments in the first place," and provides "evidence that specifically places the sun in such an environment."

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