Halley's Comet Returns Approximately Every ______________ Years

Q2: Craters on the Moon are believed to

Q64: Other than Earth, the only known object

Q76: The tail of a comet is longest

Q105: The _ surrounds the nucleus of a

Q112: Halley's Comet returns about every _ years.

Q124: Charon is _ only moon.

Q130: The Moon's maria, or plains, are believed

Q136: At what longitude is an observer who

Q144: During a solar eclipse, the umbra moves

Q148: The Moon rises 50 minutes later each