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Thirstv? Have a comet
Maria Martins Barbosa
Which paragraph explains what the
Herschel Space Observatory discovered
about Comet Harley 2? Type a paragraph
number on the line below.
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Is Earth part comet?
Earth had one bad day after another getting hammered by comets, asteroids, and even bigger
chunks of rock. These space invaders might be the reason why Earth has oceans of water.
Where did the ocean come from?
Earth first formed about 4.5 billion years ago. At first, it was too hot to have an ocean. Any
water would have boiled right off. After Earth cooled down, the water would stop boiling off into
space. Any water would actually stick around.
The rocky material that formed Earth in the first place contained some water. But that probably
doesn't account for all the water.
Comets are mostly water ice. It could be that comets made regular water deliveries to Earth.
It would take a lot of comets to fill the ocean! But comets could well have made a big
contribution. Asteroids contain some water too, so they may have contributed.
How can we find out?
There are still lots of comets in the solar system. The Kuiper Belt is a big region of icy objects,
Answer
Paragraph number 7 explains what the Herschel Space Observatory discovered about Comet Harley 2.