Saturday, December 11, 2004

A Spacetime map

Spacetime is cool. An excerpt from the author, John A. Gowan:
" we look outward in space we look only backward in time. Because of the finite speed of light, we cannot look out in space into the present. We see our Universe not as it is, but as it used to be, in an ordered regression of spatial shells receding into the past as we look deeper into the heavens. Furthermore, the past Universe that we see from Earth is a unique subset of the whole past, as we cannot see any of our own history, and we see only single moments in the history of other parts of the Cosmos."