Whirlpool Galaxy, optical image

Whirlpool Galaxy, optical image

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Credit: TONY & DAPHNE HALLAS/SCIENCE PHOTO LIBRARY

Caption: Whirlpool Galaxy, optical image. The Whirlpool Galaxy (M51, NGC 5194, large, right) is locked in a gravitational interaction with the smaller irregular galaxy NGC 5195 (small, left of M51). It is thought that NGC 5195 passed through the disc of M51 around 500 million years ago, then swung back through the disc to its present position behind M51 in the last 100 million years. M51 is around 50,000 light years in diameter, around half the size of our Milky Way. These two galaxies are around 37 million light years from Earth, in the constellation Canes Venatici.

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Keywords: astronomical, astronomy, astrophysical, astrophysics, canes venatici, dust lane, dust lanes, from earth, galactic nucleus, galaxies, galaxy, gravitational interaction, interacting, irregular, m51, ngc 5194, no-one, nobody, optical image, pair, science, space, space observation, spiral galaxy, star, starry, stars, universe, visible light, whirlpool galaxy

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