Active galactic nuclei (AGN) are among the most energetic phenomena observed in the universe. These luminous objects, powered ...

These high-resolution images from Solar Orbiter bring us closer to that aspiration than ever before ... and 10,832 degrees Fahrenheit and emits most of the sun’s radiation.

With a temperature between 4,500 and 6000 degrees Celsius, this is where most of the radiation from the sun comes from. The dark spots on the surface are sunspots. This high-resolution image shows ...