What’s the hottest thing in the universe?Earth's record high is 134°F (56.7°C), hot enough to melt asphalt—but cosmically mild.The planet's core hits 10,000°F (5,300°C), while the Sun’s corona reaches 5.4 million°F (3 million°C).
Black holes feature superheated gas coronas at 1.8 billion°F (1 billion°C), and the Perseus Galaxy Cluster's plasma is 90 million°F (50 million°C).The surprise: The Large Hadron Collider recreated 5.5 trillion°F (9.9 trillion°C), mimicking Big Bang heat—hotter than nature's best.Yet Quasar 3C273 tops it at 18 trillion°F (10 trillion°C), fueled by matter plunging into supermassive black holes in young galaxies