After his death Carl Sagan had a (unofficial) unit
of measurement named in his honor "A sagan is defined as at least 4
billion (the smallest amount in
"billions" is two billion, so "billions and billions" equal 4 billion).
It is estimated that the Milky Way galaxy has 100 sagan
(400,000,000,000) stars."(Neatoroma)
Along with his own unit of measurement he was
featured in a music video
put together from clips of his PBS tv show.