50 years ago, scientists were studying why the sun’s corona is so hot
There’s still a lot we don’t know about why the corona reaches extreme temperatures
![solar eclipse](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/02/012820_jl_sun-corona_feat.jpg?fit=1028%2C579&ssl=1)
Astronomers on the U.S. East Coast used the 1970 solar eclipse (shown) as a chance to learn more about the sun’s superhot corona, which becomes visible when the moon blocks the most of the light from the sun.
NASA