The layers of gases which surround a star, like our Sun, or a planet, like our Earth. An imaginary straight line around which an object rotates. A dark, fine-grained volcanic rock. A theory which states that the Universe began to expand after a super powerful explosion of concentrated matter and energy. The leftover core of a super massive star after a supernova.
Black holes exert a tremendous gravitational pull.
A scale on a thermometer where the interval between the boiling point and the freezing point of water is divided into 100 degrees. Freezing point is represented by 0 degrees and boiling point is represented by 100 degrees. The same scale is also utilized in Centigrade. A hazy cloud which surrounds the nucleus of a comet. The very hot outermost layer of a star's atmosphere.