Credits: NASA/CXC/MIT/Frederick K. Baganoff et al.
Sagittarius A-star (A*), is a certified monster, containing about 4 million times the mass of our Sun. It is our galaxy's central monster black hole and as it turns out, it let loose a powerful flare three centuries ago. We know this because of Newton; not Isac Newton, but the space telescope XMM-Newton from ESA and a couple of X-ray instruments from NASA (US) and JAXA (Japan).
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