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41.8 MB (4.6 MB compressed)
4281 x 3415 pixels
36.3 x 29.0 cm ⏐ 14.3 x 11.4 in (300dpi)
LUKE DODD / SCIENCE PHOTO LIBRARY LUKE DODD / SCIENCE PHOTO LIBRARY
Starfield centred on the border between the constellations of Ophiucus (right) and Scorpius (left). The brightest star at centre left is Antares (alpha Scorpii), a red supergiant star 500 light years from the Earth. The red supergiant phase is one of the final stages in the life of a normal star. Antares has a surface temperature of 3100K and a mass 10-15 times the solar mass. It is seen embedded in a reflection nebula (IC 4606), a cloud of dust which reflects towards the Earth the radiation emitted by Antares and nearby stars. Two globular star clusters are seen in this frame: the smaller NGC 6144 is at centre left and the larger M4 at lower centre right.
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