17 Jul '11, 10pm

NASA Earth Observato Shoemaker Impact Structure, Western Australia: The Shoemaker impact site in Australia ma...

The Shoemaker (formerly Teague) Impact Structure—located in Western Australia in a drainage basin south of the Waldburg Range—presents an other-worldly appearance in this astronaut photograph. The Shoemaker impact site is approximately 30 kilometers (19 miles) in diameter and clearly defined by concentric ring structures formed in sedimentary rocks (brown to dark brown, image center). The rocks were deformed by the impact event approximately 1.63 billion years ago (as reported by the Earth Impact Database ). Other age-dating analyses of granitic rocks at the core of the structure call this age into question (Pirajno et al. 2003) . Several saline and ephemeral lakes—Nabberu, Teague, Shoemaker, and numerous smaller ponds—occupy the land surface between the ring structures. Differences in color result from both water depth and from suspended sediments, with some bright salt c...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=51349&s...

Tweets

Poças no oceano (via @NASA)

earthobservatory.nasa.gov 19 Jul '11, 11pm

If you have never been north of the Arctic Circle, it is easy to imagine that the “ice cap” at the top of the world is a u...

NASA Earth Observato Typhoon Ma-on: Acquired Ju...

earthobservatory.nasa.gov 17 Jul '11, 9pm

On July 17, 2011, Typhoon Ma-on was located roughly 700 nautical miles (1,300 kilometers) south-southwest of Tokyo, and wa...

Deadly horse virus spreads in Australia

Deadly horse virus spreads in Australia

channelnewsasia.com 16 Jul '11, 4pm

SYDNEY: A small farm near horse racing facilities in Australia's third largest city was placed under lockdown Saturday fol...

DTN Thailand: Australia, Malaysia asylum seeker...

sg.news.yahoo.com 22 Jul '11, 2am

Inmates at Australia's Christmas Island immigration centre buried themselves in shallow graves in a symbolic gesture, a sp...