Wednesday, March 14, 2012

Really Angry Bird

You probably follow APOD if you are interested in space exploration.

However, just in case you missed it, this is a thumbnail reminder of a must see image of the Sun.


© Alan Friedman (Averted Imagination) 

Friday, March 9, 2012

Dust Devil in Mars


Dust Snake Devil on Mars
California Institute of Technology

What a camera! What an amazing image!

Click here to see the large image in all its glorious detail.

A towering dust devil, casts a serpentine shadow over the Martian surface in this image acquired by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.

The scene is a late-spring afternoon in the Amazonis Planitia region of northern Mars. The view covers an area about four-tenths of a mile (644 meters) across. North is toward the top. The length of the dusty whirlwind's shadow indicates that the dust plume reaches more than half a mile (800 meters) in height. The plume is about 30 yards or meters in diameter.

A westerly breeze partway up the height of the dust devil produced a delicate arc in the plume. The image was taken during the time of Martian year when the planet is farthest from the sun. Just as on Earth, winds on Mars are powered by solar heating. Exposure to the sun's rays declines during this season, yet even now, dust devils act relentlessly to clean the surface of freshly deposited dust, a little at a time.
NASA

Thursday, March 8, 2012