* We haven't explored the whole galaxy: We've only explored a tiny fraction of our galaxy, the Milky Way. There are likely countless planets out there that we haven't even discovered yet.
* Heat varies: The temperature of a planet depends on many factors, including its distance from its star, its atmosphere, and its geological activity. There could be planets closer to their stars than even Mercury, which is currently considered the hottest planet in our solar system.
However, we can talk about the hottest planets we know of:
* Kepler-70b: This planet orbits a star much hotter than our Sun and is estimated to have a surface temperature of around 7,000°F (3,870°C).
* KELT-9b: This planet is also extremely hot, with a surface temperature exceeding 4,600°F (2,500°C).
As we continue to explore space, we'll likely discover even hotter planets!
