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Asked by Rachel02 to Heather on 15 Nov 2014. This question was also asked by Kayleigh.
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Heather Campbell answered on 15 Nov 2014:
There is a hole range of sizes!
From tiny stars like neutron stars, which have a radius of only about 12-13km, but their mass is a few times the mass of the sun so they are very, very dense!
Some of the largest stars are hypergiant which have a massive mass and luminosity. These are 1,400 times the radius of the Sun (the Suns radius is about 695,500km).
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Comments
358spaa48 commented on :
How do you know all of this stuff
Chloe c commented on :
How do you know???????
Heather commented on :
Sizes of stars are worked out by astronomers by measuring the luminosity (the amount of light from the star). This is related to the temperature of the star and its size. Then if you take a spectrum of the star you can work out the temperature. Using this formula you can then get the size:
L = flux • Area = σ*T^4 * 4pi r^2
Where σ= 5.67×10−8 W·m^-2·K^-4