Galaxy Structure

What is the primary force that holds a galaxy together?

• Electromagnetic force

• Gravity

• Nuclear force

• Weak force

Which component of a galaxy is primarily responsible for new star formation?

• Central bulge

• Halo

• Disk component

• Spherical component

What is the main characteristic of spiral galaxies that distinguishes them from elliptical galaxies?

• They contain mostly old stars

• They have a flat, disk-like structure

• They lack a central bulge

• They are not actively forming stars

Which type of galaxy is the Milky Way classified as?

• Elliptical

• Spiral

• Irregular

• Dwarf elliptical

What is the primary difference between normal spiral galaxies and barred spiral galaxies?

• Barred spirals have a band of stars through the central bulge

• Normal spirals have no central bulge

• Barred spirals lack spiral arms

• Normal spirals are not actively forming stars

Which galaxy is the closest to the Milky Way?

• Triangulum Galaxy

• Andromeda Galaxy

• Large Magellanic Cloud

• Small Magellanic Cloud

What is the estimated number of galaxies in the observable universe?

• A few million

• A couple hundred billion

• A few thousand

• A trillion

What is the main feature of the central bulge in a galaxy?

• It contains young, hot stars

• It is rich in gas and dust

• It contains old, metal-poor stars

• It is the site of active star formation

Which component of a galaxy is described as a spherical cloud of stars and star clusters?

• Disk component

• Central bulge

• Halo

• Spiral arms

What is the Laniakea Supercluster?

• A cluster of stars within the Milky Way

• A supercluster containing approximately 100,000 galaxies

• A type of irregular galaxy

• A small group of nearby galaxies