The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
105°E
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The Sun's life time is 10 billion years. About how long is the lifetime of a star with a star has a mass of 0.1 MSun and a luminosity of 0.01 LSun?
A) 1 billion years B) 100 million years C) 100 billion years D) 10 million years
Which of the following most likely explains why Jupiter's interior releases so much heat?
A) Jupiter is contracting very gradually B) heat from radioactive decay C) a slow rate of nuclear fusion in Jupiter's core D) tidal heating
Each of the four diagrams below shows a hypothetical electric field in a certain region of empty space where the magnetic field is constant in time. 
Which of the fields are physically impossible and why?
A. This field violates Faraday’s law. B. This field violates Gauss’s law. C. This field violates both of the above laws. D. This field is physically possible.
Which of Jupiter's moons is believed to be covered with water ice and possibly have life sustaining conditions?
a. Io b. Europa c. Ganymede d. Callisto