a conclusion or opinion that is formed because of known facts or evidence.

the appearance of streamers of reddish or greenish light in the sky, usually near the northern or southern magnetic pole.

An observable fact or event

to come together with solid or direct impact.

beautiful in a dramatic and eye-catching way.

a class or division of people or things regarded as having particular shared characteristics.

a situation in which a difficult choice has to be made between two or more alternatives, especially equally undesirable ones.

not involving or relating to the use of computer technology.

involving or relating to the use of computer technology.