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NASA's Fermi Gamma-Ray Space Telescope has unveiled a previously unseen structure centered in the Milky Way. The feature spans 50,000 light-years (roughly half of the Milky Way’s diameter) and may be the remnant of an eruption from a supersized black hole at the center of our galaxy. The structure spans more than half of the visible sky, from the constellation Virgo to the constellation Grus, and it may be millions of years old.
The Cartwheel Galaxy, the result of two galaxies that collided about 700 million years ago. The outside ring is comprised of hot blue stars, formed from waves of density moving outwards following the collision. It's a bit larger than the Milky Way, and is located very far away in the constellation Sculptor. It's about 500 million light years distant, or nearly 3 sextillion miles. different shot.