January 21, 2019

12.06.10: Refurbished Hubble Catches Interstellar Speedster.

New instruments installed aboard the Hubble Space Telescope on the final repair mission are now starting to really show their stuff. Recently, astronomers revealed a new find; a massive star speeding away from the Tarantula Nebula. Located 170,000 light years distant in the Large Magellanic Cloud, this nebula is also sometimes referred to as 30 Doradus or NGC 2070. At the heart of the nebula is a star forming region known as R136. The star in question is speeding outward at an amazing 250,000 mph, or almost 70 miles a second. This would easily span the Earth-Moon distance in one hour! Already, the star has covered about 375 light years in its young estimated 1 to 2 million year long life. What accelerates a star to such a dizzying velocity? One event capable is a nearby supernova explosion. This is unlikely, because any of the siblings within 30 Dor would have been equally young. Another, more likely scenario is that this star had several early encounters with neighboring stars and promptly got flung out of the nebula. 30 Dor boasts several stars in the massive 100+ solar mass category, and is home to some of the largest stars known in the nearby universe.  First indentified in 2006 during a survey conducted at the Siding Spring Observatory in Australia, astronomers got a new view of the stellar runaway when they used it as a calibration target for the newly installed Cosmic Origins Spectrograph. They found a star perhaps 90 times the mass of our Sun unleashing furious stellar winds and carving an enormous bubble in space. COS conducts its observations primarily in the ultraviolet. Observations also confirmed that this star is one single massive entity, and not a close spectroscopic binary. Massive stars such as this are destined for a short life, ending its fusion role as a supernova and eventually leaving a remnant black hole.

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