Microgravity is the condition of near weightlessness that results when an
object undergoes free fall, or is placed at a very great distance from
massive objects like the Earth. Scientists are interested in microgravity
because many physical and biological processes work differently in a low
gravity environment. The space shuttle provides a good laboratory for
microgravity research and the SEM Program offers students of all ages an
opportunity to conduct experiments in microgravity just like the scientists.