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This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ?
We live in a nice neighborhood. Of the galaxy1, that is. The sun is about halfway2 toward the outer edge of the Milky3 Way. But the sun may have migrated vast distances through the galaxy to wind up where we are today. That’s according to computer models published in the September 10th Astrophysical Journal Letters.
By about nine billion years ago, the material for the galactic disk had mostly come together, but the actual disk formation hadn’t started. Scientists simulated the formation and evolution of the galaxy from that point, using over 100,000 hours of time on a University of Texas supercomputer and a computer cluster at the University of Washington.
Turns out that while a star is orbiting around the center of the galaxy, a spiral arm can intercept4 the star and radically5 alter that orbit. Which would explain a long-standing problem—the stars in our region have a much more varied6 chemistry than would be expected. Stellar migrations7 could thus be responsible for making our neighborhood within the Milky Way a much more diverse and interesting place.
Thanks for the minute for Scientific American's 60-Second Science. I'm Steve Mirsky .
1 galaxy | |
n.星系;银河系;一群(杰出或著名的人物) | |
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2 halfway | |
adj.中途的,不彻底的,部分的;adv.半路地,在中途,在半途 | |
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3 milky | |
adj.牛奶的,多奶的;乳白色的 | |
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4 intercept | |
vt.拦截,截住,截击 | |
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5 radically | |
ad.根本地,本质地 | |
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6 varied | |
adj.多样的,多变化的 | |
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7 migrations | |
n.迁移,移居( migration的名词复数 ) | |
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