The Universe

Outer Space refers to the universe in total, out physical plane is made up of everything within the universe. Those things that follow the Laws of Physics, or are built around these principles.

Celestial Bodies
Refers to all of the physical objects within the universe, planets, asteroids, moons, stars, etc. There are many different planets, and other bodies, that can support life.

Travel
Travel through these places can be done technologically, but humans are only just discovering how to traverse the space scientifically.

Magical beings have learned how to discern the physical locations of many planets and moons through acts of astrology, as well as with the advent of scientific advancements. And many are capable of travel to these other planets through spatial magics.