Conversation so far:
how many planets have smaller surface gravity compared to the earth
All planets except Jupiter and Neptune have a smaller surface gravity compared to the earth.
why does surface gravity of different planets differ
The surface gravity of a planet or star with a given mass will be approximately inversely proportional to the square of its radius.
how is surface gravity measured
Surface gravity is measured in units of acceleration, which, in the SI system, are meters per second squared.
do stars have high surface gravity
The surface gravity of a white dwarf is very high, and of a neutron star even higher.

Question: why do stars have high gravity
Self-contained rewrite: why do stars have high surface gravity