What kind of radiation is used in microwave ovens? What kind of radiation is produced in the cosmic microwave background? Is #1 the same as #2?
Cosmic microwave background
The cosmic microwave background is faint electromagnetic radiation in space that is a remnant of the Big Bang. Food can be cooked in a microwave oven, but not in the remnants of space radiation.
Universe events since the Big Bang 13.8 billion years ago
Can food be cooked in the cosmic microwave background?