A _____ is a group of stars that formed together and orbit a common center of mass
A) stellar association
B) star cluster
C) T Tauri star
D) brown dwarf
B
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When light travelling in air passes into a sheet of glass, it is observed to change in wavelength to 58% of its wavelength in air. What is the speed of light in the glass?
A. 5.2 x 
m/s
B. 1.7 x
m/s
C. 3.0 x
m/s
D. 2.3 x
m/s
Initially, scientists detected lower than the expected number of neutrinos from the Sun
a. True b. False Indicate whether the statement is true or false
Mesons are composed of ________ quarks, and baryons are composed of ________ quarks
a. two, two b. two, three c. three, two d. three, three
Which of the following objects are probably not located in the same general region of the solar system in which they originally formed?
A) Kuiper belt comets B) asteroids of the asteroid belt C) Pluto D) Oort cloud comets