Two spacecraft have taken a giant leap towards revealing why the Sun’s atmosphere is so damn not. The collaboration between NASA and the European Space Agency (ESA) explored an enduring mystery. In theory, the sun’s atmosphere — the corona — should be cooler than its surface. This is because the Sun’s energy comes from the nuclear furnace in its core. As the corona is further away from this heat source, logic should dictate that it’s cooler. In reality, that’s not the case. The sun’s surface is “only” around 6,000 degrees Celcius. The corona, meanwhile, is a whopping 1 million degrees — over…

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