Minute Physics takes a look at why the night sky is dark when the universe is full of stars in every direction. As stars move further away from us they become infrared and not visible by the human eye. Michael Stevens from Vsauce takes a look at what is the hottest thing in the universe. The hottest air temperature ever recorded on Earth is Death Valley’s 129 °F [54 °C], the hottest calculated temperature known is called the Planck Length and would have a temperature of 255,000 billion billion billion °F [141,000 billion billion billion °C].
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How Hot Can It Get?