The universe encompasses everything that exists, including:

* Planets: Celestial bodies orbiting stars, like Earth, Mars, and Jupiter.

* Stars: Massive, luminous spheres of plasma, like our Sun.

* Dust: Tiny particles of solid matter, often found in interstellar space.

* Gases: The most abundant component of the universe, including hydrogen and helium.

But the universe also includes things like:

* Galaxies: Vast collections of stars, gas, and dust, like the Milky Way.

* Black holes: Regions of spacetime where gravity is so strong that nothing, not even light, can escape.

* Dark matter and dark energy: Mysterious substances that make up the majority of the universe's mass and energy.

So, while planets, stars, dust, and gases are all part of the universe, they are only a small part of the vast and complex whole.