Not only did mammals sweep across the planet after K-T, but sharks expanded across the seas, explained American Museum of Natural History vertebrate paleontologist Jack Conrad.

美国自然历史博物馆脊椎古生物学家Jack Conrad解释说，k - T大灭绝之后，不但哺乳动物开始主宰地球，鲨鱼也开始在海洋中扩张。

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But while T-bills are as safe from default as anything on the planet, they yield a very low rate of return.

但是虽然从违约来看 T-bill 和这颗星球上的其它事物一样安全，它的回报率却是极低的。

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Professor Brian Cox dismisses claims that the LHC could conjure up a black hole that could suck in the entire planet: "Anyone who thinks the LHC will destroy the world is a t***"

图7：布赖恩·考克斯教授对大型强子对撞机会制造出一个可以吞掉整个地球的黑洞的说法嗤之以鼻：“这种想法太荒谬了。”

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I--You're just off on a different planet in terms of your capacity to process aural material, but we--I can't do that.

我,大家其实到了另外一个星球,要说咱们对声音材料的处理能力,但是我们,我无法做到那样

耶鲁公开课 - 聆听音乐课程节选

It doesn't rely on gravity. It doesn't rely on the planet.

这不需要依赖重力,不需要依赖地球

耶鲁公开课 - 基础物理课程节选

But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

NPR: Astronomers Prepare to Fight Pluto Demotion

But that doesn't mean the whole planet is open to the kind of reporting we do.

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Now astronomers haven't actually seen this planet, but they can tell it's there by the way its star wobbles.

NPR: Astronomers Find Planet with Similarities to Earth