what's the largest size possible for a star?

Answer 1

the most massive known star may be eta carinae. it is estimated to be between 100 and 150 solar masses. it also seems to be shedding mass at a terrific rate. this has to be the best answer so far.

read this page:
http://en.wikipedia.org/wiki/Eta_Carinae

Answer 2

Blue Supergiants that are spectral Types O or B. These stars are at most 30-50 times the Size of Our Sun. Example Beta Orionis (RIGEL)a CONFIRMED Supergiant is 912 Light Years away Yet it's 40 times bigger than Our Sun and is 21,000 times brighter than Our Sun. Try gettin' Sunblock for THAT!!!!!!
SPF 30 MILLION anyone?

Answer 3

The largest known star is Epsilon Aurigae B. It has a diameter of 2.4 billion miles. If it was where the Sun is, it would fill the entire Solar System out as far as the orbit of Saturn.

Answer 4

The largest one would be if all matter of the universe would have been contracted in that one star.

Answer 5

Supergiants are the most massive stars. In the Hertzsprung-Russel diagram they occupy the top region of the diagram. In the Yerkes spectral classification supergiants are class Ia (most luminous supergiants) or Ib (less luminous supergiants). The most luminous supergiants are often classified as hypergiants of class 0.

Supergiants can have masses from 10 to 70 solar masses and brightness from 30,000 up to hundreds of thousands times the solar luminosity. They vary greatly in radii, usually from 30 to 500, or even in excess of 1000 solar radii. The Stefan-Boltzmann law dictates that the relatively cool surfaces of red supergiants radiate much less energy per unit area than those of blue supergiants; thus, for a given luminosity red supergiants are larger than their blue counterparts.

Because of their extreme masses they have short lifespans of only 10 to 50 million years and are only observed in young cosmic structures such as open clusters, the arms of spiral galaxies, and in irregular galaxies. They are less abundant in spiral galaxy bulges, and are not observed in elliptical galaxies, or globular clusters, all of which are believed to be composed of old stars.

Supergiants occur in every spectral class from young blue class O supergiants stars to highly evolved red class M supergiants. Rigel, the brightest star in the constellation Orion is a typical blue-white supergiant, whereas Betelgeuse and Antares are red supergiants.

The modelling of supergiants is still an active area of research and is made more difficult by issues such as stellar mass loss. Rather than modelling individual stars, the latest trend has been to model clusters of stars and then compare the distribution of the resulting models with the observed supergiant distributions in galaxies like the Magellanic Clouds.

The first stars in the universe are thought to have been considerably brighter and more massive than the stars in modern universe. These stars were part of the theorized population III of stars. Their existence is necessary to explain observations of elements other than hydrogen and helium in quasars.

Most type II supernova progenitors are thought to be red supergiants. However, the progenitor for Supernova 1987A was a blue supergiant. It is believed that it was a red supergiant before losing its outer layers to the strong stellar wind.

Currently, the largest known stars in terms of physical size, not mass or luminosity, are the supergiants KW Sagitarii, KY Cygni, V354 Cephei, VV Cephei, and μ Cephei (the Garnet Star).

Answer 6

Er... the sun is 332,946 times more massive than earth, and the brightest in our sky is 18 times more massive than the sun. So find the mass of earth and there's your answer.

Answer 7

A blue or red supergiant

Answer 8

Our universe.

Answer 9

Probably....Marlon Brando but Dom DeLuise would be close too.

Answer 10

gj copy/pasting the article williegod. Im sure he will pick you as a best answer, you lazy bum.