Compared with our Sun, most stars in the halo are
A) young, red, and dim and have fewer heavy elements.
B) young, blue, and bright and have much more heavy element material.
C) old, red, and dim and have fewer heavy elements.
D) old, red, and dim and have much more heavy element material.
E) old, red, and bright and have fewer heavy elements.
C
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The majority of stars in the Milky Way appear to be in the ________.
A. Sagittarius A* region B. 6,000 K to 10,000 K temperature range C. O and B spectral type D. mass range of 0.1 to 0.5 solar masses
Which of the following conditions must exist for a solar eclipse to occur?
A) Moon phase is new, and the Moon is passing through the Earth's orbital plane. B) The only condition is that the phase of the Moon must be full. C) Moon phase is full, and the Moon is passing through the Earth's orbital plane. D) The only condition is that the phase of the Moon must be new.
An astronaut leaves Earth in a spaceship at a speed of 0.96 c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year
) According to the astronaut, how long does the trip take? A) 14.4 years B) 22.7 years C) 9.34 years D) 15.0 years E) 4.20 years
Which of these is true about the absolute temperature of an ideal gas?
a. It is directly proportional to the average speed of the gas particles. b. It is directly proportional to the average kinetic energy of the gas particles. c. It does not depend on the average kinetic energy of the gas particles. d. It is directly proportional to the volume of the gas particles. e. It is directly proportional to the pressure of the gas particles.