coreyspowell, 
Another day, another cosmic mystery:
Recently, astronomers discovered that the sky is dotted with huge structures called ORCs (odd radio circles).
Now they can see that these circles glow in x-rays, too. But it's still not clear how ORCs form or what makes them shine so intensely.
https://www.nasa.gov/missions/xmm-newton/x-ray-satellite-xmm-newton-sees-space-clover-in-a-new-light/ #space #science #astronomy #astrodon #nasa
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