NASA’s Parker Solar Probe May Solve 500-Year-Old Sun Mystery | Space

NASA’s Parker Solar Probe is on its way to another close encounter with the sun, where investigators hope the spacecraft will solve a long-standing solar mystery.

Source: NASA’s Parker Solar Probe May Solve 500-Year-Old Sun Mystery | Space

This will pretty awesome if they discover the answer. My students always ask me why the surface is cooler than the out atmosphere.