An astrophysicist is a scientist who studies the stars. They might study the stars in order to learn more about the universe, or they might study the stars to learn more about the Earth.
To accelerate is to increase the speed or rate of something. When something is accelerating, it is moving faster than normal.
To disintegrate is to break down and to lose its original form. When something disintegrates, it often becomes pieces that no longer belong together.
To evaporate is to disappear or to turn into vapor. When you evaporate water, it turns into steam and water vapor.
To reverse something is to turn it around, to go in the opposite direction. When you reverse the polarity of a battery, you change the direction of the electricity.
To devour something is to eat it completely. You might say that someone devoured a pizza whole, or that a group of people devoured a cake.
A supermassive black hole is a very large hole in the center of a galaxy. They are so large that they can suck in entire stars and galaxies.