'Elephant trunks' in space

Mar 07, 2011
Image credit: NASA/JPL-Caltech/UCLA

(PhysOrg.com) -- NASA's Wide-field Infrared Survey Explorer, or WISE, captured this image of a star-forming cloud of dust and gas, called Sh2-284, located in the constellation of Monoceros. Lining up along the edges of a cosmic hole are several "elephant trunks" -- or monstrous pillars of dense gas and dust.

The most famous examples of elephant trunks are the "Pillars of Creation" found in an iconic image of the from NASA's . In this WISE image, the trunks are seen as small columns of gas stretching toward the center of the void in Sh2-284, The most notable one can be seen on the right side at about the 3 o'clock position. It appears as a closed hand with a finger pointing toward the center of the void. That elephant trunk is about 7 light-years long.

Deep inside Sh2-284 resides an open star cluster, called Dolidze 25, which is emitting vast amounts of radiation in all directions, along with stellar winds. These stellar winds and radiation are clearing out a cavern inside the surrounding gas and dust, creating the void seen in the center. The bright green wall surrounding the cavern shows how far out the gas has been eroded. However, some sections of the original gas cloud were much denser than others, and they were able to resist the erosive power of the radiation and . These pockets of dense gas remained and protected the gas "downwind" from them, leaving behind the elephant trunks. These pillars can also be thought of as rising like stalagmites from the cavern walls.

Sh2-284 is relatively isolated at the very end of an outer spiral arm of our . In the night sky, it's located in the opposite direction from the center of the Milky Way.

The Sh2-284 nebula is classified as an HII region, as is LBN 114.55+00.22 featured in the September 16, 2010 image. HII regions go hand in hand with star formation, and indeed the stars in the central Dolidze 25 cluster have just recently formed. They're hot, young, bright stars, with ages ranging from 1.5 to 13 million years -- infants by astronomical standards. In comparison, the sun is about 4.6 billion years old.

The colors used in this image represent specific wavelengths of infrared light. Blue and cyan (blue-green) represent light emitted at wavelengths of 3.4 and 4.6 microns, which is predominantly from stars. Green and red represent light from 12 and 22 microns, respectively, which is mostly emitted by dust.

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User comments : 3

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Shelgeyr
1.7 / 5 (10) Mar 07, 2011
...are several "elephant trunks" -- or monstrous pillars of dense gas and dust.


"...are several "Birkeland Currents" -- or monstrous pillars of electrified plasma."

There! Fixed it for ya!
HannesAlfven
1.6 / 5 (7) Mar 07, 2011
Hannes Alfven had an expression that he'd say whenever he noticed a scientist in one department reproducing the work of a a scientist in a different department:

"Walk down the hallway."

It's long past due for astrophysicists and astronomers to stop using the silly language of children, and walk down the hallway to their plasma physics laboratory. As more of the PUBLIC gains an awareness of what Birkeland Currents are, the astrophysicists increasingly look very silly using terms like "elephant trunks."

Charge separation is VERY common in space. In fact, it happens in every single drop of water:

http://www.youtub...Ewn6iWOo

In fact, the solid and liquid states of matter are electromagnetic resonances. That leaves gas as the only state not defined by electricity!
Beard
not rated yet Mar 10, 2011
No fun allowed.

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