19
May 11

AMS: ready to discover the particle universe

Source: ESAPortal


AMS-02 instrument being installed to the ISS. Image credit: NASA.

The largest and most complex scientific instrument yet to be fitted to the International Space Station was installed today. Taken into space by the Space Shuttle, the Alpha Magnetic Spectrometer will sift ten thousand cosmic-ray hits every minute, looking for nature’s best-kept particle secrets. (read more)

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19
May 11

Galaxy Evolution Explorer finds Dark Energy repulsive

Source: NASA News


Artist's impression of GALEX.
Image credits: NASA/JPL-Caltech.

A five-year survey of 200,000 galaxies, stretching back seven billion years in cosmic time, has led to one of the best independent confirmations that dark energy is driving our universe apart at accelerating speeds.

The survey used data from NASA's space-based Galaxy Evolution Explorer and the Anglo-Australian Telescope on Siding Spring Mountain in Australia.

The findings offer new support for the favored theory of how dark energy works - as a constant force, uniformly affecting the universe and propelling its runaway expansion. They contradict an alternate theory, where gravity, not dark energy, is the force pushing space apart. According to this alternate theory, with which the new survey results are not consistent, Albert Einstein's concept of gravity is wrong, and gravity becomes repulsive instead of attractive when acting at great distances. (read more)

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