| Crystals formed in microgravity usually have a more perfect structure than those grown on Earth. |
| Other physical sciences experiments are focused on subjects including foam and fire, both of which behave in very different ways in microgravity. |
| Once beyond Earth's atmosphere, astronauts are exposed to ionizing radiation and microgravity. |
| For the first 73 seconds, he or she experiences microgravity at less than one percent of normal gravity. |
| Once in space, astronauts must adapt to microgravity, a nearly weightless environment. |
| Protein crystallization and cell biology are two areas in which microgravity research is particularly promising. |
