Scientists are concerned that melting Arctic sea ice will increase the amount of fresh water in the <a href="/earth/polar/arctic_currents.html">Beaufort Gyre</a>, which could spill out into the Atlantic and cause major climate shifts in North America and Western Europe. Watch the <a href="/earth/changing_planet/freshwater_arctic.html">Changing Planet: Fresh Water in the Arctic video</a>.<p><small><em> Courtesy of Jack Cook, WHOI (<a href="http://www.whoi.edu">Woods Hole Oceanographic Institute</a>)</em></small></p>A group of Emperor penguins wait their turn to dive into the ocean near <a href="/people/postcards/jean_pennycook_11_29_0.html">Ross Island, Antarctica</a> on November 3, 2004. Emperor penguins routinely dive to 500 meters in search of food.  Scientists are interested in understanding how they can endure the stress of these dives in such an <a href="/earth/extreme_environments.html">extreme environment</a>.<p><small><em> Image courtesy of Emily Stone, National Science Foundation</em></small></p>The massive 9.0 magnitude <a href="/earth/geology/quake_1.html">earthquake</a> off of Honshu, Japan on <a href="/headline_universe/march112011earthquaketsunami.html">11 March 2011</a> generated a <a href="/earth/tsunami1.html">tsunami</a> that exceeded 10 meters on the coast near the epicenter. This image shows model projections for the tsunami wave height in cm which are in good agreement with the observed waves.<p><small><em><a href="http://blogs.agu.org/wildwildscience/files/2011/03/680_20110311-TsunamiWaveHeight.jpg">NOAA Tsunami Wave Height Projections image</a></em></small></p>As permafrost thaws, the land, atmosphere, water resources, ecosystems, and human communities are affected. Coastal areas and hillsides are vulnerable to erosion by thawing of permafrost. Thawing permafrost also causes a positive feedback to global warming, as carbon trapped within the once-frozen soils is released as <a href="/physical_science/chemistry/methane.html">methane</a>, a powerful <a href="/earth/climate/cli_greengas.html">greenhouse gas</a>. Watch the NBC Learn video - <a href="/earth/changing_planet/permafrost_methane_intro.html">Thawing Permafrost and Methane</a> to find out more.<p><small><em>Image courtesy of the USGS</em></small></p>Stars don't last forever. Occasionally, a star bigger than our Sun will end its life in a huge explosion, called a <a href="/the_universe/supernova.html">supernova</a>. The center of the star collapses in less than a second, blowing away the outer layers of the star. There are many beautiful images of supernova remnants, the expanding shell of gas made up of the outer layers of the original star. This image is the Vela Supernova Remnant.<p><small><em>Image courtesy of the Anglo-Australian Observatory/Royal Observatory Edinburgh</em></small></p>There are over 900 <a href="/the_universe/uts/megalith.html">rings of stone</a> located in the British Isles. The most famous of these stone rings is of course, <a href="/the_universe/uts/stonehenge.html">Stonehenge</a>. The stones of Stonehenge were put in place between 3,000 B.C and 2,000 B.C. by neolithic people.Some speculate that the site was built as a temple of worship of the ancient Earth deities. Some say it was used as an <a href="/the_universe/uts/stonehenge_astro.html">astronomical observatory</a> of sorts. Still others say it was a burial ground.<p><small><em> Image courtesy of Corel Photography.</em></small></p>

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New Computer Model Advances Climate Change Research

The new Community Earth System Model will allow scientists to study climate change in more detail than ever before ...Read more
Brought to you by NSF

Cloud Formation and Weather Fronts

Weather fronts can cause clouds to form. Fronts occur when two large masses of air collide at the Earth's surface ...Read more
Brought to you by CMMAP

The Sun Today

Live and recent images of the Sun from telescopes around the world and satellites in space. Spanning the spectrum from X-rays to infrared images, these views reveal sunspots, solar flares, and ...Read more
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Charles Darwin

Charles Darwin was an English naturalist who lived between 1809-1882. He laid the foundations for the modern science of biology and changed how other scientists understood ...Read more

Saturn

Saturn, the second largest planet in our Solar System, is famous for its magnificent rings. This gas giant has many moons and is the 6th planet from the Sun ...Read more

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Chemical Sedimentary Rocks

Unlike most other sedimentary rocks, chemical rocks are not made of pieces of sediment. Instead, they...Read more

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