Space Is Not Really Dark

Hinzugefügt: 2026-05-29

[00:00:00]Space is not really dark. It's filled with a faint microwave glow called the cosmic microwave background. That's the oldest light we can detect. Light from the early universe that got stretched into microwaves [music] as space expanded. Scientists map it with radio telescopes, which pick up tiny variations in the signal across the sky.

[00:00:17]So, the darkness of space is really ancient light we've learned how to measure.