Stars and the Universe Concepts

The video explains that while there are around a septillion stars in the observable universe, only about five thousand are visible to the average human eye, and only half of these can be seen from one side of the Earth. It also introduces the idea that the universe might be infinite, potentially containing an infinite number of stars, though verifying this is challenging.

Approximately how many stars are there in the observable universe?

• A billion

• A septillion

• A million

• A trillion

How many stars can the average human eye see in the sky?

• About five hundred

• About five thousand

• About fifty thousand

• About five million

What fraction of the visible stars can be seen from one side of the Earth?

• Three-quarters

• All of them

• Half

• One-quarter

What is a possible characteristic of the entire universe?

• It is finite in size

• It is shrinking

• It has a fixed number of stars

• It is infinite in size

Why is it difficult to confirm the number of stars in the universe?

• Because stars are constantly moving

• Because the universe might be infinite

• Because the universe is too bright

• Because stars are too small