AW! .. a sneezy wheezy death is lousy to see anywhere .. lol,your description is funny though .. this one is new here, i think .. it's a beauty, too .. everyone should watch it to the very end .. VY Canis Majoris, diameter 2 800 000 000 km ..
The exact order of this list is not complete yet, nor is it perfectly defined:
* There are sometimes high uncertainties in derived values and sizes;
* The distances to most of these stars are uncertain to differing degrees and this uncertainty affects the size measurements;
* Several large stars have extended atmospheres, are embedded in mostly opaque dust shells or disks, and pulsate, such that determining their radii is not well defined;
* There are theoretical reasons for expecting that no stars in our galaxy are larger than approximately 1,500 times the sun, based on evolutionary models and the Hayashi .. http://en.wikipedia.org/wiki/Chushiro_Hayashi .. instability zone. The exact limit depends on the metallicity of the star, so for example supergiants in the Magellanic Clouds have slightly different limiting temperature and luminosity. Stars exceeding the limit have been seen to undergo large eruptions and to change their spectral type over just a few months;
* A survey of the Magellanic Clouds has catalogued most of the red supergiants and 44 of them are larger than the 700 solar radii cutoff point of this table, with the largest at 1,200-1,300.
Relative sizes of the planets in the Solar System and several well known stars, including VY Canis Majoris. * Mercury < Mars < Venus < Earth * Earth < Neptune < Uranus < Saturn < Jupiter * Jupiter < Wolf 359 << Sun < Sirius * Sirius < Pollux < Arcturus < Aldebaran * Aldebaran < Rigel << Antares < Betelgeuse * Betelgeuse < Mu Cephei < VV Cephei A < VY Canis Majoris.
VY Canis Majoris (VY CMa) is the largest known star by radius and also one of the most luminous. It is a red hypergiant in the constellation Canis Major. It is 1800–2200 solar radii (8.2–10.2 astronomical units) in radius, about 3.0 billion km (1.864 billion mi) in diameter, and about 1.5 kiloparsecs (4,900 light-years) distant from Earth. VY CMa is a single star categorized as a semiregular variable and has an estimated period of 2,000 days. It has an average density of 5 to 10 mg/m3.
Late stage dying hypergiants--like VY Canis Majoris--have enormous masses that are difficult to measure. While the star itself is incredibly large--over 1800 times the size of our sun--it's mass is being ejected in a wide, far-reaching corona that spreads out like a swirling fir in space to over 2100 times the size of the sun.
Massive Star VY Canis Majoris - Polarized Light Astronomers Map a Hypergiant Star's Massive Outbursts
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