Black holes do not have a temperature in the conventional sense, such as the temperature of a hot object like a burning fire. However, black holes do emit a form of radiation called Hawking radiation, which is a consequence of quantum effects near the event horizon—the boundary beyond which nothing can escape the gravitational pull of a black hole.
According to Stephen Hawking's theory, pairs of particles and antiparticles can spontaneously be created near the event horizon. Sometimes, one particle falls into the black hole while the other escapes, resulting in the appearance of radiation. This radiation carries away energy from the black hole, causing it to gradually lose mass and eventually evaporate entirely.
As for wormhole travel, it remains purely speculative at this point. Wormholes are hypothetical structures that arise from certain solutions to Einstein's field equations in general relativity. They are shortcuts in spacetime that could potentially connect distant regions or even different universes. However, no direct observational evidence for the existence of wormholes has been found, and their stability and practicality for travel are still highly uncertain.
Theoretical studies suggest that traversable wormholes, which could be used for travel, would require the presence of exotic matter with negative energy densities to stabilize them. Exotic matter with such properties has not been observed in nature so far, and its existence is purely hypothetical.
In summary, while black holes emit radiation known as Hawking radiation, they are not "hot" in the conventional sense. Wormhole travel, although an intriguing concept, remains highly speculative and requires the presence of exotic matter that has not been observed in reality.