Review of Deep-Sky Objects Lecture

Astronomy 25

1) We are concerned with five classes of deep-sky objects:

a) _______________ - loosely congregated newer stars.

b) _______________ - tightly packed balls of older stars.

c) _______________ - interstellar clouds of dust and gas.

d) _______________ - outer shell of a degenerate star.

e) _______________ - vast stellar islands containing the above.

2) The two most common naming conventions for the objects we have seen

are the _________ catalogue of 110 stars and the ___________ catalogue.

3) Stars of Population II are older / younger than Population I.

4) Globular clusters tend to form a halo around a galaxy’s ________.

5) Diffuse nebulae are bright clouds of mostly hydrogen where

____________ come into being.

6) Jupiter has a planetary nebula. T / F

7) There are roughly a million galaxies in the universe. T / F

8) Galaxies come in two major shapes: ________ and ________.

9) Both types contain about the same proportion of Population I and

Population II stars. T/ F

10) Your best chance of seeing a new star is in a _______ galaxy.

1) Our galaxy, the Milky Way, is a ________ galaxy.

2) Our Sun is situated toward the middle / the outside of the Milky Way.

3) Galaxies tend to group together in a large general area. T / F