The study of planets, stars, and other objects in space.
In addition to or also.
A round hole in the shaped of a bowl.
A unit for measuring how warm something is.
A stage or step in a series that one goes through.
The distance from side to side and through the center of a circle or a round object.
To look steadily at something for a long time.
The force on our planet that pulls things toward the center of the earth.
The condition of being serious.
To turn or throw something back.
To think carefully about something.
An object that makes distant things seem closer and larger.
All of space and all of the objects in space.