The mystery of where Earth’s water came from deepens

(File)

WASHINGTON (AP) — Where did the Earth get its water?

It’s a mystery that got murkier as some astronomers essentially ruled out one of the chief suspects: comets.

Over the past few months, the European Space Agency’s Rosetta space probe closely examined the type of comet that some scientists believed could have brought water to our planet 4 billion years ago. It found water, but the wrong kind. It contains more of a hydrogen isotope than water on Earth does.

The author of a study in the journal Science says it could be that asteroids brought water to Earth. But others disagree.

Many scientists have long believed that Earth had water when it first formed, but that it boiled off, so that the water on the planet now had to have come from an outside source.

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

WTNH NEWS8 provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Commenters who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others. If you see an inappropriate comment, please flag it for our moderators to review. Also, you can now block any inappropriate user by simple selecting the drop down menu on the right of any comment and selection "Block User" from there.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s