Images of the burning Cuyahoga shocked anation, and it led one Wisconsin Senator the following year to organizethe first Earth Day to call attention to the dangers of ignoring ourenvironment.

燃烧的凯霍加画面震惊了整个美国，而且致使美国威斯康星州一位参议员翌年举办了第一个地球日呼吁关注无视环境的危险。

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How it could happen: Objects from space impact Earth all the time, generally burning up in the atmosphere.

它是怎样产生的：空间物体随时都在影响着地球，一般都在大气层中烧毁。

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Soon, the spaceship left Earth, and everyone looked down at the burning planet.

很快，飞船离开了地球，大家俯视着下面这颗燃烧着的星球。

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This could be a serious problem. The shield protected the spacecraft from burning up from the extreme heat of re-entering the Earth's atmosphere.

VOA: special.2009.06.17

The material that is burning up in Earth's atmosphere during the Quadrantids likely comes from a comet that broke into fragments centuries ago, NASA says.

CNN: Meteor shower will light up night sky for just a few hours

That's still big enough potentially to produce meteorites -- which are meteoroids, or fragments thereof, that do manage to hit the Earth -- before burning completely.

CNN: Meteor lights up East Coast -- and social media

And a few years before that, an 80-tonne space rock called 2008 TC3 ploughed into the Earth's atmosphere, largely burning up and scattering fragments over the Sudan - just 20 hours after it was discovered.

BBC: Science & Environment