The video explores galaxies, defining them as clusters of billions of stars held by gravity. It discusses the challenges of observing galaxies due to light pollution and the use of telescopes like the Hubble Ultra Deep Field. Galaxies are classified by shape: spiral, elliptical, and irregular, with their shape linked to age. The Milky Way, our home galaxy, is detailed, highlighting its spiral arms and the potential black hole at its center. The video concludes with a reflection on the wonder of galaxies and their role in understanding the universe.

What is a galaxy primarily composed of?

• Billions of stars held together by gravity

• A collection of black holes

• A single star and its planets

• A cluster of planets

Why is it difficult to observe galaxies from cities?

• Due to light pollution

• Because of the Earth's rotation

• Due to the presence of too many stars

• Because galaxies are too small

What tool is used to capture images of distant galaxies?

• A satellite

• A microscope

• The Hubble Ultra Deep Field telescope

• A regular camera

How are galaxies typically classified?

• By their distance from Earth

• By their appearance

• By their size

• By their color

Which type of galaxy is associated with younger stars?

• Spiral galaxies

• Elliptical galaxies

• All types of galaxies

• Irregular galaxies

Where is our solar system located within the Milky Way?

• On one of the spiral arms

• In an elliptical cluster

• In an irregular region

• At the center of the Milky Way

What is believed to be at the center of the Milky Way?

• A giant planet

• A massive black hole

• A supernova

• A cluster of comets

How wide is the Milky Way galaxy?

• 10,000 light years

• 50,000 light years

• 100,000 light years

• 200,000 light years

Why can't we take a photograph of the entire Milky Way?

• Because it is moving too fast

• Because it is too far away

• Because we are inside it

• Because it is too bright

What did early astronomers likely think when they observed the night sky?

• They thought the sky was empty

• They ignored the stars

• They incorporated the stars into belief systems

• They believed the stars were close