Which of the following properties make flare stars so active?
A) fast rotation rates
B) deep convection zones
C) convecting cores
D) strong stellar winds
E) both A and B
E
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Moonquakes on the Moon were detected by
A) the radar observations over time from Earth. B) the seismographs left these by the Apollo astronauts. C) laser beams reflected off mirrors left on the Moon by Apollo missions. D) seismographs attached to the Russian Lunar rovers. E) telescopic observations of lunar landslides.
The intensity of an electromagnetic wave is 8 × 107 W/m2. What is the amplitude of the magnetic field of this wave?
A) 8.2 × 10-4 T B) 3.3 × 10-7 T C) 10 T D) 14 T E) 5.8 × 10-4 T
Which of the following best describes the lunar maria?
A) relatively smooth, flat plains on the Moon B) densely cratered regions on the Moon C) mountainous regions on the Moon D) frozen oceans of liquid water on the Moon
Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.