Galaxies

Our closest neighbor is the triple star system, ______________ ________________, at a distance of about 4 light-years.

With a telescope, we measure the _________________ brightness of a star.

We can translate this to an _________________ scale to learn the true luminosity of a star only if we know the distance to the star.

The diameter of the flattened disk of our galaxy stretches ___________ light-years across.

The Sun is located about _________________ of the way between the center and the outer edge of the Milky Way.

• one-third

• one-fourth

• two-thirds

• one-half

It is ________________ for us to take a picture of the Milky Way because we have not traveled far enough through space to gain a full view of our galaxy.

Considering the ratio of the diameter of the galaxy to the height of the galactic disk, the dimensions of the Milky Way are thinner than a __________.

• dime

• quarter

• nickel

There is a central bulge in the Milky Way galaxy that contains mostly young and massive stars, and a ________________________ black hole.

The Milky Way galaxy contains somewhere between ____________ and _____________ stars.

• 100 billion

• 200 million

• 400 billion

• 400 million

A __________ ______________ looks like a spherical cloud of light from great distances, telescopes have resolved these clouds into dense collections of millions of stars.

• globular cluster

• open cluser