space science

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several scientific disciplines, such as exobiology, that study phenomena occurring in the upper atmosphere, in space, or on celestial bodies other than Earth.
• noun A discipline related to or dealing with the problems of space flight.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any scientific discipline concerned with the study of phenomena occurring in space, or with space flight.