Roughly how many galaxies exist in the observable universe?

Hundreds of billions to trillions

What was the Hubble Deep Field?

An image showing thousands of distant galaxies

The Galaxies Quiz – Facts Worth Knowing

Take the galaxies quiz to explore the Milky Way, Andromeda, spiral, elliptical and irregular galaxies, Edwin Hubble's discoveries, galaxy collisions and the deepest views of the universe. Ten questions with facts worth knowing about the giant star cities of space.

Start the Galaxies Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Home
What is the name of our galaxy?
Neighbor
Which is the nearest large spiral galaxy to the Milky Way?
Hubble
Who proved in the 1920s that other galaxies exist beyond the Milky Way?
Types
Which galaxy type has arms curling from the center?
Collision
What will the Milky Way and Andromeda probably do in billions of years?
Center
What lies at the center of most large galaxies?
Count
Roughly how many galaxies exist in the observable universe?
Clouds
Which small galaxies orbit the Milky Way and are visible from the Southern Hemisphere?
Deep Field
What was the Hubble Deep Field?
Shape
What shape are elliptical galaxies?

Explanations: answer key for all 10 questions

Q1: What is the name of our galaxy?
Answer: The Milky Way
It contains hundreds of billions of stars.
Q2: Which is the nearest large spiral galaxy to the Milky Way?
Answer: Andromeda
It is about 2.5 million light-years away.
Q3: Who proved in the 1920s that other galaxies exist beyond the Milky Way?
Answer: Edwin Hubble
He measured stars in Andromeda.
Q4: Which galaxy type has arms curling from the center?
Answer: Spiral
The Milky Way is a barred spiral.
Q5: What will the Milky Way and Andromeda probably do in billions of years?
Answer: Merge
The result may be called Milkomeda.
Q6: What lies at the center of most large galaxies?
Answer: A supermassive black hole
Ours is Sagittarius A*.
Q7: Roughly how many galaxies exist in the observable universe?
Answer: Hundreds of billions to trillions
Estimates keep changing.
Q8: Which small galaxies orbit the Milky Way and are visible from the Southern Hemisphere?
Answer: The Magellanic Clouds
They look like detached pieces of the Milky Way.
Q9: What was the Hubble Deep Field?
Answer: An image showing thousands of distant galaxies
It looked at a tiny empty-looking patch of sky.
Q10: What shape are elliptical galaxies?
Answer: Smooth and oval
They contain mostly older stars.

The Galaxies Quiz – Islands of Stars

Galaxies are enormous collections of stars, gas, dust and dark matter held together by gravity. Our Milky Way is a barred spiral galaxy about 100,000 light-years across, with the Sun located in one of its spiral arms.

Until the 1920s, many astronomers thought the Milky Way was the whole universe. Edwin Hubble proved that fuzzy spirals like Andromeda were separate galaxies, and later showed that galaxies are moving apart as the universe expands.

Galaxies come in spiral, elliptical and irregular shapes and often collide and merge. Telescopes like Hubble and James Webb reveal galaxies that formed less than 400 million years after the Big Bang, helping astronomers understand cosmic history.

What This Quiz Teaches

This quiz is for space fans exploring galaxies.

What our galaxy is called
Which galaxy is nearest
Who discovered other galaxies
What galaxy types exist
What lies at galaxy centers

Did You Know?

Andromeda is visible to the naked eye in dark skies.
Dwarf galaxies are the most common type.
Galaxies form clusters and superclusters.
The Sombrero Galaxy has a bright dust lane.
Webb has seen galaxies over 13 billion years old.