There are thought to be more stars in the
universe than there are grains of sand on all the
beaches of the world combined. So, since we
have only seen a small number of stars, we
probably haven't found the hottest star. The
hottest star we have found is called R136a1:
hottest star . It has a temperature of around
72000 degrees Farenheit. The hottest stars are
blue, as is this one. Stars are more hot when they
die than when they are born. Some stars explode
when they die (after billions of years). These
explosions are called supernovas or
hypernovas, and may be well over
This is an excellent question, as it is
difficult to pin down the hottest temperature.
When astronomers talk about the temperature of a
star, they are referring to the temperature of its
surface. They can calculate its surface
temperature from the colors that it emits. A
yellow sun like ours has a surface temperature of
~5500°C. The brightest and hottest stable star we
have seen so far is a blue-colored supergiant
called HD 93129A, with a surface temperature of
~48,000°C. This star is 2.6 million times brighter
and it’s radius is 25 times larger than our sun.
Blue supergiants are very rare and burn through
their stores of hydrogen quickly.
While this is very hot, stars are even hotter
at their center. Even our sun has a core
temperature of about 15 million degrees. (That’s
15,000,000°C.) Stars are the hottest when become
supernova, where the explosion of radiation can
reach temperatures of 100 million degrees
(100,000,000,000°C). The hottest spot we’ve
observed in the universe was estimated at 300
million degrees where multiple galaxies collided.
hottest spot in the universe )
Scientists estimate that the “Big Bang”
explosion that created the universe was up to 10x
hotter than that. That’s really hot!
Surprisingly, the hottest point in the universe
recently may be man-made by scientists at
Brookhaven National Lab. They collided particles
at very high speeds to simulate the beginning of
the universe and achieved temperatures greater
than 4 trillion degrees! (4,000,000,000,000°C)
hottest temperature measured )
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