Thursday, August 14, 2014

Galactic Archaeology and dark matter

Gaia is also designed to identify exoplanets . We think we can make a complete inventory of body type Jupiter in orbit around 200,000 stars closest to the Sun, up from 150 to 200 parsecs and detect thousands of planetary systems by measuring the movements of their star guests . It will also be possible to detect transits planetary photometrically.

With nearly a billion pixels, Gaia features the largest digital camera ever flown in space. The satellite rotates slowly on itself, once every six hours, scanning the sky with both telescopes. It will measure the positions and velocities of distant billion stars in the Milky Way, 30,000 light years away. © Esa, YouTube

Galactic Archaeology and dark matter
http://androidstars.newsvine.com/_news/2014/08/05/25184541-chasing-comets
http://androidgeek.ucoz.com/blog/the_screen_as_corrective_lens/2014-08-06-18
http://carmiell.blogspot.com/2014/08/stem-cells-after-graft-failure-nose.html

Which probably most fascinates astronomers and astrophysicists, is the possibility of the galactic archeology and attempt to better understand the nature of dark matter or disprove its existence directing us to change laws gravitation through Mond.

Indeed, Gaia must measure the positions and velocities of a billion stars in the Milky Way by performing a complete survey of the sky up to magnitude  20. In the same way that a sufficiently accurate throes of the water surface in a pool measure can tell us who jumped, where, when and what side it will be possible to go back in time to experience a part of the history of our Galaxy . How was it formed in accreting matter, such as the dwarf galaxies or current tide of stars torn from previous interactions with larger galaxies. This is one of the questions we hope to answer.

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