You Had Me At Halo

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Behold: the majestic disc of NGC 2841 – one of the most massive known galaxies, a mere 46 million light years away in the constellation of Ursa Major. To wit:

This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk. Dust lanes, small, pink star-forming regions, and young blue star clusters are embedded in the patchy, tightly wound spiral arms. In contrast, many other spirals exhibit grand, sweeping arms with large star-forming regions. NGC 2841 has a diameter of over 150,000 light-years, even larger than our own Milky Way. The featured composite image merges exposures from the orbiting 2.4-meter Hubble Space Telescope and the ground-based 8.2-meter Subaru Telescope. X-ray images suggest that resulting winds and stellar explosions create plumes of hot gas extending into a halo around NGC 2841.

(Image: NASA, ESA, Hubble, Subaru; Composition & Copyright: Roberto Colombari)

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