Massive Rogue Star Racing Through the Milky Way

Rhoophi
 
'A massive star named Zeta Ophiuchi flung away from its former companion is racing through space dust, creating a brilliant bow shock, seen above as a yellow arc in this new image (below) from NASA's Wide-field Infrared. The star is huge with a mass of about 20 times that of our sun. In this image, in which infrared light has been translated into visible colors we see with our eyes, the star appears as the blue dot inside the bow shock.


Zeta Ophiuchi once orbited around an even heftier star. But when that star exploded in a supernova, Zeta Ophiuchi shot away like a bullet. It's traveling at a whopping 54,000 miles per hour (or 24 kilometers per second), and heading toward the upper left area of the picture.

As the star tears through space, its powerful winds push gas and dust out of its way and into what is called a bow shock. The material in the bow shock is so compressed that it glows with infrared light that WISE can see. The effect is similar to what happens when a boat speeds through water, pushing a wave in front of it.

This bow shock is completely hidden in visible light. Infrared images like this one from WISE are therefore important for shedding new light on the region.

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The Daily Galaxy via JPL/NASA

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