It’s an extra-sunny Sunday for NASA’s Parker Solar Probe, which is making its third close pass around the sun today (Sept. 1).
The spacecraft is designed to help scientists better understand the sun and, in particular, its outer atmosphere, called the corona. That atmosphere is millions of degrees, whether Fahrenheit or Celsius — much hotter than the visible surface of the star — and scientists can’t quite figure out where all that heat comes from.
So NASA built the Parker Solar Probe, which will make 24 daring dives into the corona by the end of its mission, in 2025. The spacecraft launched last August and has already completed two solar flybys. The third close encounter will come today around 1:50 p.m. EDT (1750 GMT).