Swift's most important contributions to astronomy are not exactly eye candy. Designed to swivel toward deep-space explosions at a moment's notice, Swift excelled at capturing bright, fleeting and faraway specks of light. The multiwavelength observatory was equipped with optical, ultraviolet (UV) and X-ray instruments, allowing it to catch cosmic bursts of energy across the electromagnetic spectrum, zeroing in on flares of light that other telescopes might miss.
How the Swift Observatory saw the gamma-ray burst GRB 221009A, which may be the most energetic emission of this kind ever seen. (Image credit: NASA/Swift/A. Beardmore (University of Leicester))
But Swift also took millions of observations of the nearby universe, including galaxies in our backyard. One of its most jaw-dropping images is this 24-hour exposure of the Andromeda galaxy (M31), located about 2.5 million light-years from Earth.
More space photos(Image credit: NASA's Goddard Space Flight Center, Tyler Desjardins (STScI))Andromeda is the closest major galaxy to ours, and it may be destined for a shared fate. Scientists suspect that Andromeda and the Milky Way are drawing closer together and might eventually collide. The merger would add Andromeda's roughly 1 trillion stars to our sky, though there probably wouldn't be any life left on Earth to appreciate it.
According to NASA, the observatory detected some 20,000 ultraviolet light sources in this image, captured over two months from May to July 2008. These sources include thousands of dense, hot star clusters scattered across Andromeda's 150,000-light-year-wide ring, as well as the distant galaxy M32 (seen as a bright orb of light to the bottom right of Andromeda's center).
In visible-light images of Andromeda taken with ground-based telescopes, the galaxy's bright center bleaches out many of the fiery young stars that emerge in Swift's view. While Swift likely won't be remembered best for shimmering starscapes like this one, it's a powerful reminder that looking at familiar structures in a new light can change everything.
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