Our (distant) Future

NASA: An image of the galaxy Arp299B, which is undergoing a merging process with Arp299A (the galaxy to the left), captured by NASA’s Hubble space telescope. The inset features an artist’s illustration of a tidal disruption event (TDE), which occurs when a star passes fatally close to a supermassive black hole. A TDE was recently observed near the center of Arp299B.

Is this our future? Yes it or something approximating this will, it seems, will happen. The Milky Way and the Andromeda Galaxy will one day merge. Not to worry, it will be many millions of years in the future. Most galaxies are red-shifted, moving away from us; most but not all. Andromeda is blue-shifted meaning it is moving towards us.

Red-shifted? Blue-shifted? Ahh, the Doppler Effect.

Image: NRAO/AUI/NSF/NASA/STScI

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