Galaxies, part 1

In the 1920's, what type of pulsating stars were observed in the spiral nebula M31 in Andromeda?

• RR Lyrae stars

• G2V type stars

• pulsars

• Cepheid variables

Which astronomer argued, in 1920, that "the Milky Way was all there is"?

• Harlow Shapley

• Edwin Hubble

• Heber Curtis

• Milton Humason

What is the biggest and most active star forming gas cloud in any nearby galaxy?

• the Orion Nebula

• the Eagle Nebula

• the Crab Nebula

• the Tarantula Nebula

What type of galaxy is the Milky Way?

• elliptical

• spiral

• peculiar

• irregular

Current thinking is that elliptical galaxies are the products of ___

• condensed nebula

• collapsed spiral galaxies

• supernova explosions

• galactic collisions

What type of galaxy tends to be small and are truly shapeless?

• elliptical

• peculiar

• odd

• irregular

In the early 20th Century, "faint fuzzies" displaying a variety of shapes in the sky were simply called ___

• faint fuzzies

• nebulae

• smoky dots

• bulging halos

Star forming nebulae in spiral arms are colored pink by the characteristic glow of ___

• cooling helium

• hot metallic elements

• excited oxygen

• warm hydrogen

In the 1920's it was determined that the "Great Andromeda Nebula" was actually ___

• a spiral nebulae

• a Cepheid variable

• within the Milky Way

• an entirely separate galaxy

Which astronomers "unlocked the mystery" of spiral nebulae in the 1920's?

• Harlow Shapley and Milton Humason

• Heber Curtis and Milton Humason

• Edwin Hubble and Harlow Shapley

• Edwin Hubble and Milton Humason