This is science but there is no choice for that :) Can anyone help me define the following vocabulary terms: universe, solar system, galaxy, cluster, constellation?

Universe:  all of space and time (collectively referred to as spacetime) and their contents.

Solar System: gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.

Galaxy: a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Cluster: a group of stars formed closely

Constellation: a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.

Explanation:

Our Solar System consists of our star, the Sun, and its orbiting planets (including Earth), along with numerous moons, asteroids, comet material, rocks, and dust. Our Sun is just one star among the hundreds of billions of stars in our Milky Way Galaxy. If we shrink the Sun down to smaller than a grain of sand, we can imagine our Solar System to be small enough to fit onto the palm of your hand.  Pluto would orbit about an inch from the middle of your palm.

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