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  1. Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,300 mi). The angular diameters of stars can be measured directly using stellar interferometry.

  2. The first list gives stars that are estimated to be 60 M ☉ or larger; the majority of which are shown. The second list includes some notable stars which are below 60 M ☉ for the purpose of comparison.

    Star Name
    Mass ( M☉, Sun = 1)
    Approx. Distance From Earth ( Ly )
    Apparent Visible Magnitude
    Westerhout 49-2 (in Westerhout 49 )
    18.246 (J band)
    BAT99-98 (in Tarantula Nebula of LMC )
    R136a1 (in Tarantula Nebula of LMC )
    Melnick 42 (in Tarantula Nebula of LMC )
    • Who Discovered Uy Scuti?
    • Where Is Uy Scuti?
    • How Do You Measure The Size of A star?
    • Other Big Stars
    • Additional Resources

    In 1860, German astronomers at the Bonn Observatory first cataloged UY Scuti, at the time naming it BD -12 5055, reported Astronomy Magazine(opens in new tab). During a second observation, astronomers realized it grows brighter and dimmer over a 740-day period, leading to its classification as a variable star.

    The star lies near the center of the Milky Way, roughly 9,500 light-years away from Earth. Located within the constellation Scutum, UY Scuti is a hypergiant star. Hypergiants — larger than supergiants and giants — are rare stars that shine very brightly. They lose much of their mass through fast-moving stellar winds. Related: Hypergiant star's weig...

    However, all stellar sizes are estimates. "The complication with stars is that they have diffuse edges," astronomer Jillian Scudder of the University of Sussex wrote for The Conversation(opens in new tab). "Most stars don't have a rigid surface where the gas ends and vacuum begins, which would have served as a harsh dividing line and easy marker of...

    UY Scuti's large radius does not make it the most massive, or heaviest, star. That honor goes to R136a1, which weighs in at about 300 times the mass of the sun but only about 30 solar radii. UY Scuti, in comparison, is only about 30 times the mass of the sun, but far greater in volume. Size comparisons are still more complicated because UY Scuti do...

    If you're curious about the smallest known star in the universe check out this interesting article from BBC Science Focus(opens in new tab). Learn more about measuring stellar sizes with these resources from the Rochester Institute of Technology(opens in new tab) and in new tab).

  3. 9. Feb. 2015 · The approximate size of the star is about 750m miles, or nearly eight astronomical units, where one astronomical unit is the distance between the earth and the sun. This is large enough that it...

  4. Below is a list of the largeststars, so far discovered, ordered by radius. The unit of measurement used is the radius of the Sun(696,392 km; 432,717.927 mi). Additional methods[change| change source] A few stars are in the Zodiac, and the Moon sometimes passes in front of them. This allows calculating their size by their angular size and distance.