Can hyrogen change to another state?

Answer 1

Yes. (Assuming hyrogen is actually Hydrogen) All elements which can be found on a current Periodic Table could theoretically be in any of the 4 states. Some states are not very attainable at STP here on Earth, however the majority of elements in the universe (out in space) are not solid, liquid or gas, but believed to be plasma. For example solid or liquid Hydrogen is not easily obtained in the laboratory, but hydrogen in the form of gas and plasma is fairly easy to find or make. Our Sun is another good example of a place where hydrogen can be found as a gas or in a plasma.