Cosmic background radiation 2 | Scale of the universe | Cosmology & Astronomy | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation. Created by Sal Khan. Watch the next lesson: Missed the previous lesson? Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next