Physical Cosmology

Learn the answers to questions about physical cosmology - the study of the origin and evolution of the universe.

Learn the answers to questions about physical cosmology - the study of the origin and evolution of the universe. Less

Can't we just destroy dangerous asteroids?

What orbits a star before the planets form?

What's the structure of the Milky Way?

Why was Pluto demoted?

What's a protogalaxy?

What's a planetesimal?

What existed before our solar system?