On which planet can the pole remain in darkness for 42 years, and then have 42 years of constant daylight?
A) Jupiter
B) Saturn
C) Uranus
D) Neptune
E) Pluto
C
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The most accurate way to determine the surface temperature of a star is to study the pattern of emission lines from various atoms
a. True b. False Indicate whether the statement is true or false
When examining a spectrum of a particular galaxy, an astronomer notices that thespectral lines are shifted toward shorter wavelengths. What does this mean?
a) the element Helium is present in that galaxy b) the galaxy is moving away from us c) the galaxy is very likely to be one of the nearest galaxies to the MilkyWay d) the entire Universe is contracting e) the galaxy is rotating very rapidly
Which type of binary can have their sizes measured directly by photometry?
A) virtual B) visual C) eclipsing D) spectroscopic E) astrometric
Why do we believe Earth has an iron core?
A. The properties of seismic waves match those expected of a region of iron. B. Samples from deep holes are iron rich. C. X-ray cameras show a dark, impenetrable mass at the planet's center. D. Astronomers have seen asteroid impacts sinking into the deep interior. E. Volcanoes erupt nearly pure iron.