They use a variant of this "powers of 10" concept at the Hayden Planetarium
in NYC. You can take a walk from micro to macro -- known universe to
sub-atomic -- in jumps of powers of 10, on a ramp that encloses the
planetarium proper. The planetarium itself is a sphere in the middle of the
display, and is used as a reference point -- "If the planetarium sphere
represents the size of a hydrogen atom, then this dot is the size of a
proton within its nucleus." Very cool; if you are in NYC, check it out. Oh
yeah, and don't forget to look at the newly revamped Hall of Meteorites in
the Museum proper :-)
Tracy Latimer
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