19 Apr '11, 10pm

Elevation Map of Badain Jaran Desert [image] #NASA

Elevation Map of Badain Jaran Desert [image] #NASA

Spread sand on an even surface so that the layer is perfectly flat. You might think that gravity should keep the layer even. But even a flat layer of sand is unstable because grain sizes differ and respond differently to the same breeze. A light wind can form ripples on a sand surface in just minutes. Over years, centuries, and millennia, winds can sculpt sand into incredibly complex shapes. Some of our planet’s most elaborate sand dunes are found in the Badain Jaran Desert, in the western part of Inner Mongolia. Researchers have long puzzled over how to best study these dunes, but mapping them in three dimensions has become much easier, thanks to a NASA satellite. The images shown here offer two views of the Badain Jaran Desert as observed by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite. The top image is an elevation...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=50140&s...

Tweets

Forest carbon map released for the US via @mongabay

Forest carbon map released for the US via @mong...

news.mongabay.com 20 Apr '11, 8pm

Birnam Wood in the 21st Century: northern forest invading Arctic tundra as world warms (03/07/2011) In Shakespeare's play ...

Earth's Magnetosphere [image] #NASA

earthobservatory.nasa.gov 22 Apr '11, 10pm

You've seen the pattern in science class when you laid bits of iron around a bar magnet. The invisible force field around ...

NASAの画像:ちょうど1年前の4月に公開された写真。Solar Dynamics Observatoryという新しいミッションからの太陽の写真。左下の白丸は地球のサイズでとっても小さい!

NASAの画像:ちょうど1年前の4月に公開された写真。Solar Dynamics Obser...

earthobservatory.nasa.gov 20 Apr '11, 3am

On April 21, 2010, NASA released the first-light images from its newest sun-monitoring mission, the Solar Dynamics Observa...

Sunset over Western South America [image] #NASA

earthobservatory.nasa.gov 24 Apr '11, 10pm

Astronauts onboard the International Space Station see, on average, 16 sunrises and sunsets during a 24-hour orbital perio...

Image via Sprint

treehugger.com 18 Apr '11, 3pm

, "For those who are dedicated environmentalists or just interested in finding some simple yet meaningful ways to begin li...

Can Tech Make the Desert Bloom Again?: Sde Boqe...

greentechmedia.com 18 Apr '11, 2pm

Sde Boqer, Israel --- The archeological remains of Avdat seem like a strange place to study farming. The site -- a camel c...

Bassas da India in Sunglint [image] #NASA

Bassas da India in Sunglint [image] #NASA

earthobservatory.nasa.gov 17 Apr '11, 10pm

The vantage point on the International Space Station provides astronauts with many dramatic views of Earth. Occasionally t...