Cosmic Rays and Beyond

Read 20.4 Cosmic Rays to learn about the nature and origins of cosmic rays, which are high-energy particles traveling through interstellar space.
Watch the TED-Ed video How cosmic rays help us understand the universe for a concise introduction to cosmic rays.
Explore 20.5 The Life Cycle of Cosmic Material to understand how interstellar matter flows through the Galaxy, changes phases, and contributes to the formation of new stars and planetary systems.
Watch the video Are We Actually In A Nebula?, which provides a nice summary of what we have learned so far in this unit as well as evidence that our own solar system may be located inside of a nebula.
Review 20.6 Interstellar Matter around the Sun to learn about the Sun’s location within the Local Fluff and the Local Bubble, and how these regions affect interstellar material density around the Sun.