A mirage occurs when light travels faster
A) near the ground than higher up.
B) in less dense air than more dense air higher up.
C) both of these
D) neither of these
Answer: C
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What will be an ideal response?
Which of the following is true of wavelengths of signals sent into space?
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The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____
a. 10 parsecs b. 50 parsecs c. 100 parsecs d. 200 parsecs e. 500 parsecs
Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 1 year B) 6 months C) 2 years D) It cannot be determined from the information given.