A parsec is I. a unit of length used in astronomy II. 2.06 105 AU III. the distance to an imaginary ...

A parsec is I. a unit of length used in astronomy II. 2.06 105 AU III. the distance to an imaginary star whose stellar parallax is one arc second IV. 3.26 light years V. the longest unit of length in astronomy

a. I, II, V b. II, IV
c. I, III, IV, V d. I, II, III, IV, IV

Question 2

Hypernovae are

a. supernovae that occur when two red dwarfs collide.
b. supernovae that occur when 10-solar-mass stars explode.
c. supernovae that occur when stars more massive than 25 solar masses explode.
d. one theory to explain the production of gamma-ray bursters.
e. supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.

Question 3

__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere.

a. Ozone b. Water vapor
c. Methane d. Carbon dioxide

Question 4

Two stars of the same spectral class must have the same

a. radius.
b. temperature.
c. mass.
d. distance.
e. all of the other choices.

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A parsec is I. a unit of length used in astronomy II. 2.06 105 AU III. the distance to an imaginary ...

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