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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.
It’s not every day we get a chance to time travel. Other than into the future at the rate of one second per second. But astronomers2 say they’ve done a little traveling into the past. In November of 1572, legendary3 astronomer1 Tycho Brahe peered up at the night sky. He saw what looked like a strangely bright star in the constellation4 Cassiopeia. It was brighter even than the nearby planet Venus. He studied that bright new star for five months, until it faded away. But what Brahe saw wasn’t a new star. It was actually an old star undergoing the brilliantly bright death of a supernova.
Scientists at the Subaru Telescope in Japan recently analyzed5 what could be called echoes of this more than 400-year-old event. They published their research in the December 4th issue of the journal Nature. Light from the original supernova bounced off dust particles in the interstellar clouds and eventually reached us here on earth more than four centuries later. Scientists used these echoes to determine that Brahe witnessed a type Ia supernova.
Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.
1 astronomer | |
n.天文学家 | |
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2 astronomers | |
n.天文学者,天文学家( astronomer的名词复数 ) | |
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3 legendary | |
adj.传奇(中)的,闻名遐迩的;n.传奇(文学) | |
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4 constellation | |
n.星座n.灿烂的一群 | |
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5 analyzed | |
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析 | |
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