Webb image archive
First Stars: Temperature, Brightness, and Color
Massive Population III stars could have been as hot as 100,000 kelvins—more than 90,000 degrees hotter than the Sun. The hotter any object is, the more electromagnetic radiation...
- Date
- Dec 13, 2023
- Observatory
- James Webb Space Telescope
- Credit
- NASA / ESA / CSA / STScI
- Archive ID
- 4356
Massive Population III stars could have been as hot as 100,000 kelvins—more than 90,000 degrees hotter than the Sun. The hotter any object is, the more electromagnetic radiation (light) it gives off, and the higher energy the radiation is. Population III stars would have been much brighter than the Sun, giving off mostly high-energy ultraviolet rather than visible light.