  With round-the-clock monitoring of galactic bulge microlensing events, the
PLANET experiment constrains the abundance and can yield the discovery of
planets down to the mass of earth around galactic disk and bulge stars. Data
taken until 1999 imply that less than 1/3 of bulge M-dwarfs are surrounded by
jupiter-mass companions at orbital radii between 1 and 4 AU. The current rate
of microlensing alerts allows 15-25 jupiters and 1-3 earths to be probed per
year.
