onsdag 1. mai 2013

Chicken or the Egg?

Earlier tonight I saw the last half of an American science documentary about asteroids. Throughout history billions of these rocks have crashed into Earth. Many of them contain ice, so supposedly the blue colour on our planet comes from such impacts. Some asteroids even seem to carry liquid water; and if that is the case, there may be living organisms onboard too; and if that is the case, this may very well be the explanation of how life first came to Earth. So far, nothing worth mentioning. I have heard this story before. However, this was the first time I have ever heard anyone suggest this as a possible answer to the ancient mystery about the origin of life. And what a strange suggestion it was! How did life begin? Why, it came sailing in on the back of an icy rock.

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