Astronomy Distance and Size Concepts

The video explores the vastness of the universe, starting with familiar objects like Earth and scaling up to the observable universe. It explains the size of Earth, the distance to the Moon, and the scale of the solar system. The video introduces light years to measure interstellar distances and describes the Milky Way, local galaxies, and superclusters. Finally, it discusses the observable universe's size and the limitations of our knowledge.

What is the diameter of the Earth in kilometers?

• About 20,000 kilometers

• About 13,000 kilometers

• About 8,000 kilometers

• About 5,000 kilometers

How many Earth diameters away is the Moon from Earth?

• 20 Earth diameters

• 40 Earth diameters

• 10 Earth diameters

• 30 Earth diameters

What is the approximate distance from the Sun to Neptune?

• 9 billion kilometers

• 12 billion kilometers

• 4.5 billion kilometers

• 1 billion kilometers

What unit is used to measure distances between stars?

• Astronomical units

• Kilometers

• Miles

• Light years

How far is Proxima Centauri from our solar system?

• About 20 light years

• About 10 light years

• About 4 light years

• About 1 light year

What is the diameter of the Milky Way galaxy?

• 200,000 light years

• 100,000 light years

• 10,000 light years

• 50,000 light years

How many galaxies are in the local group?

• About 30 galaxies

• About 50 galaxies

• About 10 galaxies

• About 100 galaxies

What is the diameter of the Laniakea supercluster?

• 1 billion light years

• 500 million light years

• 300 million light years

• 100 million light years

What is the diameter of the observable universe?

• 150 billion light years

• 46 billion light years

• 13 billion light years

• 93 billion light years

How much larger is the entire universe estimated to be compared to the observable universe?

• 50 times larger

• 100 times larger

• 250 times larger

• 500 times larger