A spaceship is a vehicle that is used to travel through space. Spaceships are usually large and expensive, and they require a lot of fuel to travel long distances.
When two people are reunited, they are finally able to meet again after being apart for a long time. Sometimes this reunion is happy, and sometimes it's not.
When something is unmoving, it is not moving. A statue is usually unmoving, even if it is moving slightly.
Quantified means that something has been measured or calculated in some way. When you say that something is quantified, you are saying that you can measure or calculate it.
Inertial is a type of energy that is not moving. It is the energy that is used to keep objects in motion.
To perceive something is to understand it, to be aware of it. When you perceive a color, you are seeing the color that is reflected in the light.
To converge is to move closer together. When two streams or rivers converge, they meet and become one.
When something is asymmetrical, it is not balanced. This can be a problem because it can be difficult to control or move the object.
Spacetime is the space that exists around us in which we live and move. It is composed of grains of matter called galaxies, and it extends far beyond our own galaxy.