Andromeda

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Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way. Its name stems from the area of the sky in which it appears, the constellation of Andromeda.

The 2006 observations by the Spitzer Space Telescope revealed that the Andromeda Galaxy contains approximately one trillion stars, more than twice the number of the Milky Way’s estimated 200 to 400 billion stars. The Andromeda Galaxy, spanning approximately 220,000 light-years, is the largest galaxy in our Local Group, which is also home to the Triangulum Galaxy and other minor galaxies. The Andromeda Galaxy’s mass is estimated to be around 1.76 times that of the Milky Way Galaxy (~0.8-1.5×1012 solar masses vs the Milky Way’s 8.5×1011 solar masses).

The Milky Way and Andromeda galaxies are expected to collide in ~4.5 billion years, merging to form a giant elliptical galaxy or a large disc galaxy. With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects — making it visible to the naked eye on moonless nights, even when viewed from areas with moderate light pollution. — Wikipedia

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Scientists capture most-detailed radio image of...
    on July 28, 2021 at 3:20 pm

    Scientists have published a new, detailed radio image of the Andromeda galaxy—the Milky Way's sister galaxy—which will allow them to identify and study the regions of Andromeda where new stars are born.

  • Fermi spots a supernova's 'fizzled' gamma-ray...
    on July 26, 2021 at 8:27 pm

    On Aug. 26, 2020, NASA's Fermi Gamma-ray Space Telescope detected a pulse of high-energy radiation that had been racing toward Earth for nearly half the present age of the universe. Lasting only about a second, it turned out to be one for the record books—the shortest gamma-ray burst (GRB) caused by the death of a massive star ever seen.

  • Planetary nebulae in distant galaxies
    on July 23, 2021 at 1:59 pm

    Using data from the MUSE instrument, researchers at the Leibniz Institute for Astrophysics Potsdam (AIP) succeeded in detecting extremely faint planetary nebulae in distant galaxies. The method used, a filter algorithm in image data processing, opens up new possibilities for cosmic distance measurement—and thus also for determining the Hubble constant.

  • Satellite galaxies can continue forming stars...
    on July 6, 2021 at 8:13 pm

    Historically most scientists thought that once a satellite galaxy has passed close by its higher mass parent galaxy, its star formation would stop because the larger galaxy would remove the gas from it, leaving it shorn of the material it would need to make new stars. However, for the first time, a team led by Arianna di Cintio, a researcher at the Instituto de Astrofísica de Canarias (IAC), has shown using numerical simulations that this is not always the case. The results of the study were […]

  • To find out how galaxies grow, we're zooming in...
    on June 23, 2021 at 1:14 pm

    Across Australia, astronomers are using cutting-edge technologies to capture the night sky, hoping to eventually tackle some of our biggest questions about the universe.