Galaxia

The video tutorial explores galaxies, their composition, and the role of gravity in holding them together. It discusses the potential presence of black holes at galaxy centers and categorizes galaxies into spiral, elliptical, and irregular types. The tutorial also covers the distribution of galaxies in space, highlighting the Local Group and the proximity of Andromeda to the Milky Way.

What is a galaxy primarily composed of?

• A single star and its planets

• Millions of stars, gas, and dust

• Only gas and dust

• A few stars and a lot of planets

What force holds galaxies together?

• Magnetism

• Electromagnetic force

• Nuclear force

• Gravity

Which type of galaxy is the Milky Way?

• Spiral

• Irregular

• Barred

• Elliptical

What percentage of galaxies are spiral?

• 10%

• 20%

• 50%

• 60%

What is a characteristic feature of elliptical galaxies?

• They have a lot of gas and dust

• They have spiral arms

• They are mostly made of young stars

• They are mostly made of old stars

What is the shape of irregular galaxies?

• Elliptical

• Circular

• Spiral

• No particular shape

What is the closest galaxy to the Milky Way?

• Triangulum

• Andromeda

• Whirlpool

• Sombrero