What is the approximate range of masses that newborn main sequence stars can have?
A) 0.1 to 1,000 solar masses
B) 0.001 to 150 solar masses
C) 0.001 to 10 solar masses
D) 0.1 to 150 solar masses
E) 0.1 to 10 solar masses
D
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What is a gluon?
a. A flavor of quark. b. The most newly discovered lepton. c. A combination of three complementary quarks. d. A particle exchanged by quarks. e. A particle exchanged by electrons to give electrical repulsion.
An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to reach you is
a. 20 s b. 10 s c. 1 s d. 0.1 s e. more than 20 s
The expansion of the universe seems to be accelerating. The evidence for this is based on observations of
A) the manner in which the stars are distributed in our own galaxy. B) the cosmic background radiation. C) the slowing down in the pulsation rate of distant neutron stars. D) gas clouds orbiting the centers of galaxies. E) the redshift in the light from the explosions of distant supernovas.
Electrons are negatively charged
Indicate whether the statement is true or false