The disk of our galaxy consists of
a. the nine known planets.
b. only stars.
c. stars, dust, and gas.
d. quasars.
e. only black holes.
c
RATIONALE: Refer to ‘galaxy' on page 5.
You might also like to view...
Conductive heat transfer can only occur if solids mediate the energy transfer
Indicate whether the statement is true or false
At the center of the Sun, fusion converts hydrogen into
A) hydrogen compounds. B) plasma. C) radiation and elements like carbon and nitrogen. D) radioactive elements like uranium and plutonium. E) helium, energy, and neutrinos.
The ________ a period ________, that coincides with ________.
A. magnetic cycle is; of 22 years; a period of intense solar and earthquakes B. sunspot cycle is; of 11 years; the Sun's rotation around its axis C. Maunder Minimum is; of low sunspot activity; the "little ice age" in the late 17th century D. solar cycle is; of high sunspot activity; the cycle of the planetary alignments
A white dwarf star is about the size of
A) the sun. B) a highway truck. C) the head of a pin. D) Earth. E) Actually, it doesn't have any size at all.