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.
B
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A star's apparent magnitude is a measure of how bright it appears to us if it is at its actual distance
a. True b. False Indicate whether the statement is true or false
Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges. Which Gaussian surfaces have an electric flux of +q/?o through them?
(1) a.
(2) b.
(3) b and d.
(4) c.
(5) b and c.
Why does the Moon appear bigger near the horizon?
A. due to refraction B. due to an optical illusion C. due to the compression produced by Earth's atmosphere D. due to reflection
A planet is much more massive than the star it orbits
a. True b. False Indicate whether the statement is true or false