FEATURED IMAGE: 19 Dec 2014, 23:15 UTC | Horsehead of a Different Color 26 December 2014, 11:31:40UTC RSS RSS | About | Contact | Site Map
Home » Press Releases » Why Is Earth So Dry?
Bookmark and Share
HubbleSite NewsCenter -- Latest News Releases

Why Is Earth So Dry?

17 Jul 2012, 17:00 UTC
Why Is Earth So Dry?

Get larger image formats
With large swaths of oceans, rivers that snake for hundreds of miles, and behemoth
glaciers near the north and south poles, Earth doesn't seem to have a water shortage.
And yet, less than one percent of our planet's mass is locked up in water, and even
that may have been delivered by comets and asteroids after Earth's initial formation. Astronomers have been puzzled by Earth's water deficiency. The standard model
explaining how the solar system formed from a protoplanetary disk, a swirling disk of
gas and dust surrounding our Sun, billions of years ago, suggests that our planet should
be a water world. Earth should have formed from icy material in a zone around the Sun
where temperatures were cold enough for ices to condense out of the disk. Therefore,
Earth should have formed from material rich in water. So why is our planet comparatively
dry?

Note: All formatting and links have been removed - click title or image to see full article.

Comment on this Post

* :
* :
:
* :
:
* required
 

Most Popular

 

Last Hour


Last day


Last week

Latest Vodcast

Latest Podcast

Most Popular Video

Advertise PTTU

Extrasolar Planets

  • Planetary Systems: 1164
  • Multiple Planet Systems: 473
  • Planets: 1855
more

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod