To colonize is to take over a new area and make it part of your own country or empire. Sometimes this is done by force, but other times it is done by convincing the people there to join your country or empire.
Phew is an expression that is used to express relief or happiness. It is often used when someone has just finished a difficult task or when they have finally been able to escape from a difficult situation.
Denser means thicker. When you describe something as denser, you are saying that it is more concentrated or thicker than usual.
A supernova is a type of explosion that occurs when a star explodes. The explosion is so powerful that it can be seen from very far away.
The inside of something is the part of it that is inside the boundaries of the thing. The inside of a house is the part of it that is inside the walls of the house.
A minuscule amount is a very small amount. A minuscule amount of sugar can make a drink very sweet.
Mindblowing is an adjective used to describe something that is very surprising or amazing. When you say that something is mindblowing, you are using the word in a positive way.