Which of the following questions is best answered by information gained from Kohoutek A: Where were comets formed B: When were comets formed C: Where was the solar system formed D: How was the solar system formed

We send these devices into space and use them, for example, for communications. A: comets B: meteors C: asteroids D: satellites

No two comets ever look identical, but they have basic features in common, one of the most obvious of which is a coma.　　The word "identical" is closest in meaning to which of following? A: equally fast B: exactly alike C: near each other D: invisible