The correct term that encompasses everything in outer space, including stars, planets, and galaxies, is Universe.
- Solar System refers specifically to our own system of planets orbiting the Sun.
- Galaxy refers to a collection of stars, gas, dust, and dark matter, and there are many galaxies in the universe.
- Biosphere refers to the regions of the Earth and atmosphere where life exists, and is not applicable to outer space.
Thus, the answer is Universe.
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