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Globalwarming Watch
2007-Apr-27, 12:53 PM
A few days ago I posted "Globalwarming Awareness2007 in the Universe" into my blog below. It contains a slide that tells us how small we are in the Universe and how small the Sun compared with Antares - the biggest and the brightest star in the Universe for now.

Is there a bigger star than Antares ? :think:

dgavin
2007-Apr-28, 01:07 AM
From Wikipedia:



VY Canis Majoris (VY CMa) is a red hypergiant. This is the largest known star (http://en.wikipedia.org/wiki/List_of_largest_known_stars) and one of the most luminous stars (http://en.wikipedia.org/wiki/List_of_most_luminous_stars) known.

http://upload.wikimedia.org/wikipedia/en/thumb/3/3b/Sun_and_VY_Canis_Majoris.png/180px-Sun_and_VY_Canis_Majoris.png (http://en.wikipedia.org/wiki/Image:Sun_and_VY_Canis_Majoris.png) http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png (http://en.wikipedia.org/wiki/Image:Sun_and_VY_Canis_Majoris.png)
Size comparison between the Sun and VY Canis Majoris. You must click this image twice for a full-view.



Roberta M. Humphreys (2006) estimates the radius of VY CMa is between 1800 and 2100 solar radii. If our sun were replaced with such a star, its surface could extend to the orbit of Saturn (http://en.wikipedia.org/wiki/Saturn).


Antares has a Radius of about 700 solar radii by comparison

Sagebrusher
2007-Apr-28, 07:10 PM
It's way down the list of brightness...

http://en.wikipedia.org/wiki/List_of_most_luminous_stars

BTW, one of the brightest known stars is only around 7500 light years away...

http://en.wikipedia.org/wiki/Eta_Carinae

Globalwarming Watch
2007-Apr-30, 06:33 AM
Dear dgavin,

Thank you so much for your good answer and links information.
You make me know better about the Universe :)

publiusr
2007-Apr-30, 10:06 PM
Stunning links.

dgavin
2007-May-01, 12:32 AM
Dear dgavin,

Thank you so much for your good answer and links information.
You make me know better about the Universe :)

Most Welcome!