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 hottest star in outer space is believed to be WR 102ka, a Wolf-Rayet star located around 30,000 light-years away from Earth. It has a surface temperature of approximately 210,000 degrees Celsius (378,000 degrees Fahrenheit), making it one of the hottest known stars.

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 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 5

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Answer 6

You'd think it should be the closest moon to the Sun, which is ... the Moon. That is, Earth's moon.

However, this doesn't take one important property into account: tides. Specifically, tidal heating. As the moon Io orbits Jupiter, it experiences tides far greater than we have on Earth ... Io's solid surface rises and falls about 100 meters as it orbits. (On Earth, the highest tides are under 20 meters, and those occur in the ocean, which is much easier to move.) This generates tremendous amounts of heat, and the hottest surface temperatures in the solar system other than the Sun itself have been measured on Io.

Answer 7

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 8

the most famous and scientifically significant moons are the 4 principal satellites of Jupiter; Io, Ganymede, Callisto and Europa. In observing these moons orbiting Jupiter, Galileo saw things in space that weren't orbiting the Earth, and there ends the Geocentric model.

Answer 9

I'm not sure what the brightest moon is in the Solar System but I did find this bit of information. Hope it helps in some way.

Enceladus is not only Saturn's brightest moon, but it also has the highest albedo (reflectivity) of any body in the solar system. This moon reflects almost 100% of the sunlight that hits the surface. One reason for this reflectivity is the fresh, clean ice that makes up the relatively young surface of the moon. There are at least five different terrains visible on Enceladus including craters, smooth plains, cracks, ridges, and other deformations. The chilly average temperature of -330°F would lead one to believe that this moon is composed of solid ice. However, the huge variations in the surface led scientists to believe that there is an active liquid core, with some volcanism which has resurfaced the planet. One explanation for the heat required to maintain the liquid is the tidal mechanisms exerted on the moon by Saturn and the surrounding moons, similar to the tidal forces that heat Jupiter's moon, Io.

Answer 10

The largest moon in our solar system Ganymede which orbits Jupiter . It measures 5,268 KM across the equator . In fact , Ganymede is so large that it's even bigger than Mercury,Pluto(not considered a planet),and almost Mars.