1. Universe: The vast expanse containing all matter and energy.

2. Galaxy: A massive collection of stars, gas, dust, and dark matter, held together by gravity (like the Milky Way).

3. Nebula: A cloud of gas and dust in space.

4. Solar System: A system of planets, moons, and other objects orbiting a star (like our Sun).

5. Star: A massive ball of hot gas that produces light and heat through nuclear fusion.

6. Planet: A large celestial body that orbits a star and does not emit its own light.

Let me know if you'd like any more clarification on these!