hottest star in the universe

The hottest star known to date is named IGR J17091-3624 and has a surface temperature of about 2.5 million Kelvin (4.4 million degrees Fahrenheit). It is located about 33,000 light years from Earth in the constellation Scorpius. This star is a member of a class of objects called ultraluminous X-ray sources (ULXs), which are extremely bright X-ray sources thought to be produced by intermediate-mass black holes accreting matter from a companion star.



However, it is important to note that this is only one of the many potential explanations for the extreme brightness of ULXs and the nature of IGR J17091-3624 specifically is still a subject of ongoing research. Additionally, the temperature of a star is not constant and can change over time.

In general, the temperature of a star is determined by the balance between the heat generated by nuclear fusion in its core and the loss of heat energy through its outer layers. The temperature and other properties of a star are also influenced by its mass, age, and chemical composition.

Stars can range in temperature from a few thousand Kelvin to tens of millions of Kelvin, with the hottest stars being among the most massive and luminous. These extremely hot stars are also short-lived, burning through their fuel quickly and ending their lives in spectacular supernovae explosions.

In conclusion, while IGR J17091-3624 is currently the hottest known star, our understanding of the universe is constantly evolving and it is possible that even hotter stars may be discovered in the future.