The solar corona is the Sun's outer atmosphere, a tenuous halo of plasma extending millions of kilometers into space. It is visible to the unaided eye only during a total solar eclipse, when the Moon covers the far brighter disk beneath it. Its central puzzle is temperature: the corona reaches over a million degrees while the surface below sits near 5,500, and explaining how energy is carried upward against that gradient remains unresolved. The Parker Solar Probe was built to fly through it and measure the answer directly.
Astrophysics · Solar Physics · Heliophysics
The Sun's outer atmosphere is hundreds of times hotter than its surface, and nobody is sure why. Parker Solar Probe data points to an overlooked culpr...
Cosmology · Large-Scale Structure · Cosmological Principle
The Cosmological Principle says nothing should be larger than about 1.2 billion light-years. The Hercules-Corona Borealis Great Wall is ten billion. T...