A big rock fell through the house of Ruth Hamilton, when she was sleeping.
Luckily, she was not hurt. "I jumped out of bed and turned on the lights. I didn' t know what else to do, so I called 911, " Hamilton, from Canada, told CBC. It turns out that the rock is a meteorite(陨石). It came from the outer space! Hamilton said she would keep the rock.
So what is a meteorite? You may have seen shooting stars at night. They are flying rocks in space. Earth's gravity(重力) catches them and lets them fall. Most of them burn up in the sky. But some fall down on Earth. They are called meteorites. Every year, more than 30, 000 meteorites larger than a strawberry fall down on Earth, according to science website DK Find Out.
UK's Natural History Museum says that"the chances(概率) of a meteorite falling are the same everywhere on the Earth. " This means most meteorites end up in the seas. Few people can see them. But still, we have collected 50, 000 meteorites around the world so far.
Following are more information about the meteorite:
●A meteorite will become less than 5% of its size when it falls down on Earth.
●Every 180 years, a meteorite hits a human being, according to a 1985 study by Nature.
You may ask: can we touch a meteorite? Does it have radiation(辐射)? Don't worry. The radiation is not strong. Nothing will happen to your body.
