* Gas: This is the most common state of hydrogen found in the universe and on Earth. It is colorless, odorless, and highly flammable.

* Liquid: Hydrogen can be liquefied under high pressure and low temperatures. It is used as a fuel in some rocket engines.

* Solid: Hydrogen can be solidified at extremely low temperatures (around -259°C or -434°F). Solid hydrogen is a white, crystalline solid.

It's important to note that the state of matter depends on the temperature and pressure conditions.