What is the hottest star in outer space?

Answer 1

The hottest stars are those that appear bluish, such as Sirius.

Cygnus OB2-12 is a very bright blue hypergiant that lies between 5,000-6,000 light-years from Earth. It is with an absolute magnitude of -12.2. It is more than 6 million times brighter than the Sun, and among the most luminous stars known in the Galaxy.

The hottest star visible to the naked eye is Theta Orionis C, one of the stars illuminating the Orion nebula. It has a surface temperature of about 45,000 K.

Even hotter is a star going by the rather unmemorable name of HD 93129A; which is about 7,500 light-years away. Its surface temperature is around 50,000 K. However, it's quite distant and thus can't be seen without a telescope.

Over a short period of time, the Neutron Star burns at a temperature of over 1 billion degrees kelvin. However, the huge number of neutrinos it emits carries away so much energy that the temperature falls within a few years to around 1 million kelvins.

For comparison, the Sun's surface temperature is about 6000 K.

Answer 2

The largest star is not the hottest star, and vice versa. You can search for a list of the largest known stars in Wikipedia, but it is hard to know the real size of some of the stars, so the list may be a bit ... doubtful.

Answer 3

I depends on your definition of a star. An active or functioning star is one that there is enough pressure and temperature to allow nuclear fusion to occur, where Hydrogen atoms can collide and fuse to form Helium, and give off heat radiation in the process. The coldest active stars are the brown dwarf stars, where this type of reaction is just about sustained. One figure I have seen is 350'C, for the surface temperature for one of these brown dwarfs.

Stars which have burned out will be much colder, as they dont produce any more heat and gradually loose any heat they do have left over time. These wont be functioning stars though.

Answer 4

The largest star we currently know of is VY Canis Manoris. Its a red hypergiant star which is about 2000 times the diameter of our own. There may well be largess stars in our galaxy that we have not found yet, or can't see from our position. VY Canis Manoris is not the most massive star, it has a huge size but a very low density.

Answer 5

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Answer 6

The largest star in the universe is tagged a monster star and goes by R136a1.

Answer 7

I know the the hottest star the hottest star is white

The hottest star is the RIGEL

Answer 8

There is only one star in the solar system - Our Sun.

Answer 9

If you're talking about the astronomical star, Eta Corinae.

Answer 10

the hottest star in the space is the rigel ..