Light is a transverse wave
a. True
b. False
Indicate whether the statement is true or false
True
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Scientists today do not accept the Ptolemaic model because:
A) it is ancient history. B) it was too complicated, compared to Copernicus' heliocentric model. C) it has been shown that Ptolemy faked his data. D) it had no explanation for retrograde motion. E) the work of Tycho and Kepler showed the heliocentric model was more accurate.
The location of the Galactic Center was first found by Harlow Shapley with:
A) radio emissions from Sagittarius A. B) Cepheids of Population I in the spiral arms. C) RR Lyrae variables in the globular clusters. D) planetary nebulae in the open clusters. E) infrared observations of the heat from its accretion disk around the black hole.
Two stars are both spectral type K2V; if the closer is magnitude +3.7, and the fainter is magnitude +8.7, then the brighter star is about ________ times closer
Fill in the blank(s) with correct word
What are the two longest stages in the life of a one-solar-mass star?
a. Protostar, pre-main-sequence b. Protostar, white dwarf c. Protostar, main-sequence d. Main-sequence, white dwarf