8.6K views · 108 reactions | Why is the outer atmosphere of the Sun, the corona, 2 million °F hotter than the Sun's surface? Almost 1,000 undergraduate researchers used data from the NASA MinXSS and NOAA/NASA GOES satellites to investigate this coronal heating problem – one of the great mysteries of heliophysics. You can read about their findings here: https://bit.ly/3QljkXT | NASA Space Alerts | Facebook