Big_Bang

toc =SS5: Big Bang=

Introduction:
When light travels through hydrogen, we get certain lines of light. Distant galaxies are all redshifted. That tells us that they are all moving away from us (and each other). That implies that there was a "Big Bang" to start the history of this universe.

Activities:

 * [[image:SS_Doppler1.png link="@http://www.astro.ubc.ca/~scharein/a311/Sim/doppler/Doppler.html"]] || [[image:SS_Doppler2.png link="@http://dev.physicslab.org/asp/applets/doppler/default.asp"]] ||