The best response that encompasses everything in outer space, including stars, planets, and galaxies, is Universe.
- Solar System refers specifically to a star and the celestial bodies that orbit it, including planets, moons, and asteroids.
- Galaxy refers to a collection of stars, gas, dust, and dark matter bound together by gravity.
- Biosphere refers to the regions of the Earth and its atmosphere where life exists, which is not a term that applies to outer space as a whole.
Therefore, Universe is the most comprehensive term.
1 answer