A more thorough explanation:

Definition: Outer space refers to the known and unknown areas of the universe beyond the Earth's atmosphere. It is the space beyond airspace, which is not fixed or precise. According to international law, outer space is the space surrounding the planet that is not subject to claim of appropriation by any national sovereignty. However, the treaty does not expressly define outer space.

• When astronauts travel to the International Space Station, they are entering outer space.
• The Hubble Space Telescope orbits in outer space and captures stunning images of galaxies and nebulas.
• Outer space is also home to many natural phenomena, such as black holes and supernovas.

These examples illustrate how outer space is the vast expanse beyond our planet's atmosphere, where humans and machines can explore and observe the universe. It is a place of wonder and discovery, where we can learn more about our place in the cosmos.