Simple Definition of outer space

from our Learner's Dictionary

outer space

noun

: the region beyond the Earth's atmosphere in which there are stars and planets
a satellite in outer space
Is there life in outer space?

Cite this Entry

“Outer space.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/outer%20space. Accessed 23 Jun. 2026.

More from Merriam-Webster on outer space

More from Merriam-Webster