Why don’t space shuttle astronauts in orbit hit their heads on the ceilng of the falling shuttle

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

Which of the following are guidelines to follow for obtaining accurate observations