Morphology of Galaxies

What type of galaxy is the Milky Way?

• Spiral
• Barred Spiral
• Irregular
• Elliptical

A unit of distance equal to about 19 trillion miles (more than 30 trillion km) – is more closely related to how astronomers go about the business of figuring out the size of the universe.

• Light year

• Parallax

• Parsec

• Astronomical Unit

The central region of the Milky Way is called

• Bulge

• Halo

• Disc

• Equator

Matter that cannot be detected or has not yet been detected by the radiation it emits. Its presence can be deduced from its gravitational interaction with other bodies.

• WIMPS Weakly Interacting Massive Particles

• Massive Astrophysical Compact Halo Object (MACHO)

• Quasar

• Dark Matter

Which of the following is the best description of an Sc galaxy?

• a barred spiral galaxy with a very bright nucleus

• a spiral galaxy with loose, open arms

• a faint open cluster

• an irregular galaxy in the Sculptor cluster

The three main parts of a spiral galaxy include all of the following, EXCEPT...

• The central bulge
• The halo
• The arms
• The disk

Most of the mass of the Milky Way galaxy is thought to be...

• The black hole at its center
• Dark matter
• Dust and gas
• Main-sequence stars and planets

A barred spiral with a bright nucleus and tightly wound spiral arms is classified

• Sc

• Sb

• Sba

• Sbc

How was Hubble able to determine the distances of nearby galaxies?

• by using spectroscopy

• by observing Cepheid variables in them

• by measuring the typical angular separations of stars in them

• by measuring trigonometric parallaxes

Which type of galaxy contains the least amount of interstellar material?

• Irregular

• Barred Spiral

• Spiral

• Elliptical