Exploring the Cosmos: A Journey Through Galaxies

What term was used in the early 20th century to describe the mysterious celestial objects that were not yet recognized as other galaxies?

• Stars

• Comets

• Nebulae

• Asteroids

Who argued that the Milky Way was the entirety of the universe in the 1920 debate?

• Isaac Newton

• Edwin Hubble

• Heber Curtis

• Harlow Shapley

What type of variable stars were critical in determining the distance to the Andromeda Galaxy?

• Main sequence

• RR Lyrae

• Cepheid

• White dwarf

Which type of galaxy is characterized by a flat rotating disk and often contains a central bulge?

• Irregular

• Spiral

• Elliptical

• Peculiar

What is a key feature of elliptical galaxies?

• Spiral arms

• Blue young stars

• Lack of gas and dust

• Irregular shapes

What typically happens when two galaxies collide?

• They merge to form a new type of galaxy

• They bounce off each other

• They pass through each other without effect

• They instantly explode

What can result from a galactic collision?

• Disappearance of both galaxies

• Formation of an elliptical galaxy

• Formation of a black hole

• Creation of a new universe

What is the Milky Way currently doing to smaller galaxies?

• Colliding with them

• Ignoring them

• Absorbing them

• Observing them

What are the Magellanic Clouds?

• Clusters of stars in the Andromeda Galaxy

• Distant elliptical galaxies

• Nebulae within the Milky Way

• Irregular satellite galaxies of the Milky Way

What do astronomers believe about active galaxies?

• They are the oldest galaxies

• They emit less energy than normal galaxies

• They are smaller than most galaxies

• They emit more energy than normal galaxies