The concept of the lower temperature that could cause the end of our universe is not well-defined within current scientific understanding. The universe's ultimate fate and whether it will experience an end or not are still topics of active research and speculation.
In terms of temperature, it's important to note that the concept of temperature as we understand it may not be directly applicable to the entire universe, especially in extreme conditions or cosmological contexts. Temperature is a property that describes the average kinetic energy of particles within a system, and it is typically defined in the context of thermal equilibrium.
Approaching absolute zero (0 Kelvin or -273.15 degrees Celsius), the lowest possible temperature, is challenging, but it is not inherently dangerous. Absolute zero represents the absence of thermal energy, and reaching such low temperatures is primarily of scientific interest and has practical applications in fields like quantum physics and superconductivity research.
However, it's worth noting that extreme cooling processes can have unique effects on various materials and systems. For example, some materials undergo phase transitions or exhibit unusual behaviors at very low temperatures. These effects can be studied and utilized under controlled conditions.
In summary, the specific lower temperature that could cause the end of the universe is not currently known, and attempting to approach absolute zero itself is not considered dangerous. However, extreme cooling processes can have distinct effects on materials and systems that need to be carefully studied and understood.