What law of nature explains why the galaxy began to rotate rapidly and flatten out as it shrunk in size?
A) the law of conservation of angular momentum
B) Newton's universal law of gravitation
C) Newton's third law of motion
D) Einstein's special theory of relativity
A) the law of conservation of angular momentum
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Spectral Series: What is the longest wavelength in the Balmer series?
A. 240 nm B. 328 nm C. 365 nm D. 656 nm E. 820 nm
It was the distribution of ________ that showed Harlow Shapley we were nowhere near the center of the Milky Way early in the 20th century
A) planetary nebulae B) emission nebulae C) open clusters D) globular clusters E) supernova remnants
Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip? A) 14.4 years B) 15.0 years C) 10.8 years D) 4.20 years E) 22.7 years
What feature(s) of this spectrum indicate(s) that Mars appears red in color?
A) the wavelength of the peak labeled 3 B) the wavelength of the peak labeled 6 C) the fact that the intensity of region 4 is higher than that of region 2 D) the fact that the peak labeled 3 is higher than the peak labeled 6