The combined ________ of the Local Group binds them together
Fill in the blank(s) with correct word
gravity
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The solar system contains no extrasolar planets
a. True b. False Indicate whether the statement is true or false
A comet entering the inner solar system from afar will
a. form a tail and some time later form a coma. b. form a coma and some time later form a tail c. always form a tail, but only sometimes form a coma
What is the energy of a photon that has a wavelength equal to the de Broglie wavelength of a proton having a speed of 7.1 × 104 m/s? (mproton = 1.67 × 10-27 kg, c = 3.00 × 108 m/s)
A) 220 keV B) 150 keV C) 290 keV D) 360 keV E) 440 keV
The identification of "spiral nebulae" as large groupings of stars outside of our own galaxy was proven by ____
a. photographic plates made by Edwin Hubble showing stars and Cepheid variables b. the results of the Shapley-Curtis debate c. Immanual Kant's "island universe" theory d. William Parsons' observation and description of their spiral structure e. Harlow Shapley's observations of their radio spectrum