Par Galaksiju

What are the three main types of galaxies?

• Lenticular, spiral, dwarf

• Spiral, elliptical, irregular

• Barred spiral, elliptical, spiral

• Irregular, barred spiral, lenticular

Which type of galaxy is characterized by a flat disk and spiral arms?

• Elliptical galaxy

• Spiral galaxy

• Lenticular galaxy

• Irregular galaxy

What is the primary difference between elliptical and spiral galaxies?

• Elliptical galaxies have more gas and dust than spiral galaxies.

• Spiral galaxies are older than elliptical galaxies.

• Elliptical galaxies are more luminous than spiral galaxies.

• Elliptical galaxies lack structure and have older stars, while spiral galaxies have distinct arms and ongoing star formation.

How do astronomers detect black holes in galaxies?

• By observing gravitational effects and X-ray emissions.

• By tracking the movement of comets

• By analyzing the color of nearby planets

• By measuring the temperature of stars

What is the role of supermassive black holes in galaxy formation?

• Supermassive black holes help regulate star formation and influence galaxy dynamics.

• Supermassive black holes only exist in small galaxies.

• Supermassive black holes are formed from dying stars.

• Supermassive black holes have no impact on galaxy structure.

Can black holes be found in all types of galaxies?

• Black holes cannot exist in elliptical galaxies.

• Only supermassive black holes exist in galaxies.

• Yes, black holes can be found in all types of galaxies.

• Black holes are only found in spiral galaxies.

What evidence supports the existence of dark matter in galaxies?

• Evidence includes galaxy rotation curves, gravitational lensing, cosmic microwave background fluctuations, and galaxy cluster dynamics.

• The presence of supernova remnants

• Observations of black holes in galaxies

• Variations in star brightness over time

How does dark matter influence the rotation of galaxies?

• Dark matter has no effect on galaxy rotation.

• Dark matter influences the rotation of galaxies by providing additional gravitational pull, allowing stars at various distances from the center to rotate at similar speeds.

• Dark matter causes stars to move away from the center of galaxies.

• Dark matter only influences the formation of galaxies, not their rotation.

What percentage of the universe is believed to be made up of dark matter?

• 50%

• 27%

• 15%

• 5%

What is the relationship between dark matter and galaxy clusters?

• Galaxy clusters are formed solely from ordinary matter.

• Dark matter is a type of visible matter in galaxy clusters.

• Dark matter provides the gravitational framework that holds galaxy clusters together.

• Dark matter has no effect on the structure of galaxy clusters.