Front

Why does the sun look small in the sky to us?

Back

The sun looks small in the sky because it is 93,000,000 miles away from Earth.

Front

Which is closer to Earth: the moon or the sun?

Back

The moon is much closer to the Earth than the sun.

Front

What is a light year?

Back

A light year is the distance that light travels in one year, which is about 9.46 trillion kilometers.

Front

What is the largest object in our solar system?

Back

The largest object in our solar system is the sun.

Front

Why do scientists use light-years instead of kilometers for stars?

Back

Scientists use light-years because stars are very far away, and light-years are much bigger than kilometers.

Front

What is the main source of light and heat for Earth?

Back

The sun is the main source of light and heat for Earth.

Front

How does the distance of the sun affect its brightness?

Back

The greater the distance from the sun, the less bright it appears to us.

Front

What is the difference between a star and a planet?

Back

A star produces its own light, while a planet reflects light from a star.

Front

What is the closest star to Earth?

Back

The closest star to Earth is Proxima Centauri.

Front

How many stars are estimated to be in the Milky Way galaxy?

Back

There are estimated to be about 100 billion to 400 billion stars in the Milky Way galaxy.