What is true of spiral galaxies?
A) They are much less common at larger redshifts.
B) They are relatively rare in regions of high galaxy density.
C) They are only found in the center of rich galaxy clusters.
D) They have never been seen to have large redshifts.
E) They evolve from giant ellipticals.
B
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Answer the following statement true (T) or false (F)
What is the global positioning system (GPS)?
A) a system for determining positions on the Earth by careful observations of the Sun and stars B) a system of determining positions on the Earth by receiving radio signals from many ground-based beacons C) a system for determining positions on Earth using signals from a set of satellites in Earth orbit D) a term used to refer to any type of celestial navigation
A 47.0-kg person steps on a scale in an elevator. The scale reads 461 N. What is the elevator doing?
What will be an ideal response?
State Kepler's second law of planetary motion
What will be an ideal response?