arch6
EN_01068829_7671
HANDOUT***EDITORIAL USE ONLY***
What caused this outburst of V838 Mon? For reasons unknown, star V838 Mon's outer surface suddenly greatly expanded with the result that it became the brightest star in the entire Milky Way Galaxy in January 2002. Then, just as suddenly, it faded. A stellar flash like this had never been seen before -- supernovas and novas expel matter out into space. Although the V838 Mon flash appears to expel material into space, what is seen in the above image from the Hubble Space Telescope is actually an outwardly moving light echo of the bright flash. In a light echo, light from the flash is reflected by successively more distant rings in the complex array of ambient interstellar dust that already surrounded the star. V838 Mon lies about 20,000 light years away toward the constellation of the unicorn (Monoceros), while the light echo above spans about six light years in diameter. Photo Credit: ESA/NASA/Sipa USA
2013-03-18
NASA/Sipa USA/East News
Sipa USA
SIPA USA
sipausa_11578446
2,09MB
19cm x 21cm przy 300dpi
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