A parsec is I. a unit of length used in astronomy II. 2.06 × 10^5 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


d

Physics & Space Science

You might also like to view...

Which of the following is true of Mars?

A) It is about 95 percent of Earth's diameter. B) It has a thick atmosphere rich in water vapor. C) It is the smallest planet of the Solar System. D) It has a heavily cratered crust marked by volcanoes.

Physics & Space Science

The radius of the moon's orbit is about ____ times larger than the radius of Earth

a. 0.6 b. 6 c. 60 d. 600 e. 6000

Physics & Space Science

How have astronomers interpreted the unexpectedly fast rotation of galaxies?

A.) Scientific measurements must be wrong. B.) Galaxies may be breaking up. C.) There must be a lot of dark matter whose gravity can be felt but not seen. D.) These galaxies must have had collisions. E.) B, C, and D.

Physics & Space Science

We can measure the radii of stars in eclipsing binary systems

Indicate whether the statement is true or false

Physics & Space Science