Exploring the Universe's Composition

What is ordinary matter in the universe primarily composed of?

• Dark energy

• Atoms, stars, and planets

• Neutrinos

• Cosmic microwave background radiation

Which type of matter makes up most of the universe's mass but cannot be directly observed?

• Ordinary matter

• Dark matter

• Antimatter

• Cosmic rays

How does dark matter influence galaxies?

• It forms stars within galaxies

• It provides the light emitted by galaxies

• It influences the structure and gravitational behavior of galaxies

• It causes galaxies to emit radio waves

Which of the following is NOT a main type of galaxy?

• Spiral

• Elliptical

• Irregular

• Circular

What is a characteristic feature of spiral galaxies?

• They have a spherical shape

• They have a flat, rotating disk with spiral arms

• They lack a defined shape

• They are composed entirely of dark matter

Which type of galaxy is typically older and contains less gas and dust?

• Spiral

• Elliptical

• Irregular

• Barred spiral

What role does dark matter play in galaxy formation?

• It provides the energy for star formation

• It binds galaxies together through gravitational forces

• It creates the light emitted by galaxies

• It forms the core of stars

What is the first step in the formation of a planetary system?

• Formation of planets from gas and dust

• Collapse of a molecular cloud to form a star

• Explosion of a supernova

• Collision of two galaxies

Which of the following best describes an irregular galaxy?

• It has a well-defined spiral structure

• It has a smooth, elliptical shape

• It lacks a distinct shape and structure

• It is composed entirely of dark matter

How do stars and planets form from a molecular cloud?

• Through the process of nuclear fusion

• By the gravitational collapse of the cloud

• By the collision of asteroids

• Through the expansion of the universe