* Universe: The universe is the largest known entity, containing everything that exists: all matter, energy, space, and time. It's the all-encompassing container for everything.
* Galaxy: A galaxy is a massive collection of stars, gas, dust, and dark matter held together by gravity. Our galaxy is the Milky Way, a spiral-shaped galaxy containing billions of stars.
* Solar System: A solar system is a collection of planets, moons, asteroids, and other objects that orbit a star. Our solar system consists of eight planets orbiting the Sun.
Here's the hierarchy:
1. Universe: The universe is the ultimate container.
2. Galaxy: Galaxies are vast collections of stars, gas, and other objects that exist within the universe.
3. Solar System: Solar systems are smaller collections of planets and other objects that exist within galaxies.
Think of it like this:
* Imagine the universe as a vast ocean.
* Galaxies are like islands scattered throughout that ocean.
* Solar systems are like small boats floating near those islands.
So, a solar system is part of a galaxy, and a galaxy is part of the universe.
