circumlunar – adj. revolving about or surrounding the moon

dissect – v. to cut (a plant or dead animal) into separate parts in order to study it

appetite – n. a natural desire especially for food

atrophy – v. decrease in size or wasting away of a body part or tissue

impact – n. the act or force of one thing hitting another

ill – adj. not well or healthy : sick or unhealthy

capsule – n. a small part of a spacecraft that is separate from the rest of the spacecraft and that is where people live and work

flotation – n. the act, process, or state of floating or of causing or allowing something to float