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This is Scientific Americans' 60-Second Science, I'm Chelsea Wald. Got a minute?

Remember the good old days when we understood our solar system? Then we found out Pluto¹ wasn't a planet. And now a new study puts comets in question. The data come from NASA's Stardust Mission. That's the one that scooped² up particles from comet WILD TWO and returned to earth two years ago. The conventional wisdom is that comets originated in the outer solar system, then the sun or a planet nudged them into weird³ orbits. Well the study in the journal Science contradicts that wisdom. It turns out that the particles from WILD TWO look like they belong not to a comet but to an asteroid⁴ from the inner solar system. In fact, Stardust didn't capture any of the presolar system stuff that comet should be made of. This means that the distinction between asteroids⁵ and comets may be surprisingly blurry⁶. Some comets might have migrated out from the inner solar system or there could be lots of inner solar system stuff in the outer solar system. Either way, it's time to start rewriting those astronomy text books again.

Thanks for the minute, for Scientific Americans' 60-Second Science, I'm Chelsea Wald.

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1 Pluto
n.冥王星
参考例句：
Pluto is the furthest planet from the sun.冥王星是离太阳最远的行星。 Pluto has an elliptic orbit.冥王星的轨道是椭圆形的。

2 scooped
v.抢先报道( scoop的过去式和过去分词 )；（敏捷地）抱起；抢先获得；用铲[勺]等挖（洞等）
参考例句：
They scooped the other newspapers by revealing the matter. 他们抢先报道了这件事。来自《简明英汉词典》 The wheels scooped up stones which hammered ominously under the car. 车轮搅起的石块，在车身下发出不吉祥的锤击声。来自《简明英汉词典》

3 weird
adj.古怪的，离奇的；怪诞的，神秘而可怕的
参考例句：
From his weird behaviour,he seems a bit of an oddity.从他不寻常的行为看来，他好像有点怪。 His weird clothes really gas me.他的怪衣裳简直笑死人。

4 asteroid
n.小行星；海盘车(动物)
参考例句：
Astronomers have yet to witness an asteroid impact with another planet.天文学家还没有目击过小行星撞击其它行星。 It's very unlikely that an asteroid will crash into Earth but the danger exists.小行星撞地球的可能性很小，但这样的危险还是存在的。

5 asteroids
n.小行星( asteroid的名词复数 )；海盘车，海星
参考例句：
Asteroids,also known as "minor planets",are numerous in the outer space. 小行星，亦称为“小型行星”，在外太空中不计其数。 Most stars probably have their quota of planets, meteorids, comets, and asteroids. 多数恒星也许还拥有若干行星、流星、彗星和小行星。

6 blurry
adj.模糊的；污脏的，污斑的
参考例句：
My blurry vision makes it hard to drive. 我的视力有点模糊，使得开起车来相当吃力。来自《简明英汉词典》 The lines are pretty blurry at this point. 界线在这个时候是很模糊的。来自《简明英汉词典》