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Sunday, January 13, 2013

BEST SCIENCE PHOTOS OF THE WEEK XXXIV


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Best Science Photos of the Week
By
Live Science, 12 January 2013.

1. Largest Spiral Galaxy

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Astronomers have crowned the universe's largest known spiral galaxy, a spectacular behemoth five times bigger than our own Milky Way.

The title-holder is now NGC 6872, a barred spiral found 212 million light-years away in the southern constellation Pavo, researchers announced today (Jan. 10). The distance between NGC 6872's two huge spiral arms is 522,000 light-years, compared to about 100,000 light-years for the Milky Way.


2. T. Rex of the Seas

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Newfound fossils of a giant dolphin-shaped reptilian predator are now shedding light on how the world recovered after the most devastating mass extinction in history, researchers say.

This prehistoric sea monster could provide information on how the planet might deal with the mass extinction humans are causing now, scientists added.


3. Life on Exoplanet Moons?

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In the search for an Earth-like alien world, astronomers have had their eyes set on planets beyond our solar system, but some moons orbiting some of these exoplanets may be just as likely to support life, scientists say.

Astronomers have discovered more than 800 exoplanets, with many more candidate worlds awaiting confirmation by follow-up observations. Most of them, however, are gas giants, similar to Jupiter, and only a handful have a solid surface and orbit their host stars in the habitable zone, the range where liquid water, and perhaps life as we know it, can exist.


4. Milky Way on Diet?

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The Milky Way galaxy, home of Earth's solar system, may actually be only half as massive as currently thought, scientists say.

Stars in the far outer reaches of the Milky Way, between 260,000 and 490,000 light-years from the galactic centre, are cruising around surprisingly slowly, researchers found. Galactic mass and star velocities are linked, so the results could have big implications.


5. Shark Foetus Detects Predators

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Baby sharks still developing within leathery egg cases can sense the electric fields of predators and freeze in place to avoid detection, researchers say.

These findings could help in developing more effective shark repellents, scientists said.


6. Alien Asteroid Belt

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Astronomers have discovered a giant asteroid belt circling the bright star Vega, a find that may ultimately reveal an entire solar system of planets, scientists say.

Vega is one of the brightest stars in the night sky and located about 25 light-years from Earth. It gained fame as the fictional source of an alien signal in the science fiction novel “Contact” by famed astronomer Carl Sagan, which was adapted into a film starring Jodie Foster.


7. Stellar Explosion

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A beautiful new image snapped by a NASA spacecraft captures the aftermath of a massive star explosion with unprecedented resolution.

The image - taken by NASA's NuSTAR spacecraft (short for Nuclear Spectroscopic Telescope Array) in X-ray light - shows Cassiopeia-A, a supernova remnant located about 11,000 light-years from Earth.


8. Mysterious Black Holes

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A NASA space telescope snapped a new view of two oddball black holes shining ultra-bright in X-ray light in a distant spiral galaxy.

NASA’s NuSTAR X-ray observatory spotted the bright black holes while observing the galaxy Caldwell 5, which is located 7 million light-years from Earth in the constellation Camelopardalis (the Giraffe).


[Source: Live Science. Edited.]


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