Our Sun is a first-generation star.
a. true
b. false
b. False
(Our Sun is less than 5 billion years old and is likely a third- or fourth-generation star.)
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Which of the following worlds could an astronaut visit without the need for a spacesuit (and survive)?
A) Mercury B) Venus C) The Moon D) Mars E) None of the above; an astronaut would need a spacesuit to survive a visit to any world in the solar system (aside from Earth).
Blowing gently across the top of a soda pop bottle gives you a musical note at a certain fundamental frequency. This is most similar to
A. making a guitar string resonate at its fundamental. B. a wind chime. C. an organ pipe. D. a telephone.
Which is true about cold dark matter?
a) Cold dark matter interacts strongly with ordinary baryonic matter via the strong force. b) Cold dark matter particles travel faster than the speed of light. c) Cold dark matter particles travel more slowly than hot dark matter particles. d) Cold dark matter exists only within planets and stars but not in other parts of galaxiesor intergalactic space. e) Cold dark matter emits X-rays, but no other forms of radiation.
What are the dimensions of a square acre of ground if 1 square mile = 640 acres?
A) 147' × 147' B) 156' × 156' C) 174' × 174' D) 194' × 194' E) 209' × 209'