The Heaviest Elements on the Earth Were Produced in

Q18: Auroras consist of<br>A) colored clouds.<br>B) comet tails.<br>C)

Q19: The smallest of the following celestial objects

Q20: Pulsars are unlikely to be<br>A) small in

Q21: Stars seem to twinkle because of<br>A) variations

Q22: Black holes are the remnants of<br>A) stars

Q24: The size of a star can be

Q25: The duration of the sunspot cycle is

Q26: Sunspot activity does not affect<br>A) auroras.<br>B) the

Q27: The spectrum of a star can provide

Q28: A star must have a certain minimum