Meaning: Comets move very quickly through the large, open spaces of space.
Choice of Words: Comets: celestial objects with a tail; streak: move swiftly; vast: very large; expanse: wide, open area.
Alternative Expressions
Comets fly through big space.
Meaning: This means that comets are moving through a large, open space.
Choice of Words:Comets are objects made of ice and dust that orbit the sun. Fly means to move through the air using wings. Through means from one side to the other. Big means very large or wide. Space means the area outside of Earth's atmosphere. When you put them together, "Comets fly through big space" means that comets move through the sky, using their wings to fly.
Comets zoom past a huge area.
Meaning: This means that comets are moving very quickly through a large, open space.
Choice of Words:Comets are objects made of ice and dust that orbit the sun. Zoom means to move very quickly. Past means by or beyond something. Huge means very large or wide. Area means a particular part of space or a surface. When you put them together, "Comets zoom past a huge area" means that comets move very quickly by or beyond a large space.