nPoynting-Robertson Clock
nPhotons
emitted by sun strike objects in space
nObjects lose
speed, falling into the sun
nSmall
particles fall first
nCosmic dust
still in abundance in space
nindicates short age of the universe
nExpect to find
dispersion in meteor stream
nsorting by particle sizes
nno dispersion found
nStars still surrounded by clouds of dust and gas
nIndicates
young age