a board placed at or forming the back of something, such as a collage or piece of electronic equipment.<span> an upright board behind the basket, off which the ball may rebound.
a board used to support or straighten a person's back, especially after an accident.
Answer: There is no oxygen for astronauts to breathe, so spacecraft must be airtight. There is nothing to hold the sun's heat, so objects in space can experience a wide range of temperature.
