"The World at Night" is a traveling photography exhibit sponsored by Astronomers Without Borders, an organization that uses photography to promote the idea that everyone around the world shares a common night sky.

In this audio slideshow, astronomers and photographers discuss images of the night sky as seen over various monuments and landmarks all over the world.

Photographers have also used time lapse photography to show cosmic motions over a period of time. Hundreds of images are compiled together to make a seconds-long video so viewers can see how the stars actually move.

"When you see these images, you see the same stars and same planets but above recognizable cultural and historical monuments and landmarks. It really drives home that we're on one small object sitting in the universe and sharing our place in the universe." - Mike Simmons, Astronomers Without Borders founder and president

"One of the major messages of [The World at Night] is to show how dark skies are important and how we are losing these with those lights." - Babak Tafreshi, photographer

1. Can you see the stars clearly from where you live?

2. Why does the night sky in a city look different from when you are in the country?

1. What did you think of the slideshow? Which images did you like the best?

2. Discuss the slogan, "One People, One Sky." Why do you think Astronomers Without Borders believes it is an important message? What do you think it says?

3. In the slideshow, the photographer Babak Tafreshi says that "dark skies are important" but it is becoming more difficult to see them because of the lights on earth. Why might it be important to see the night sky? What do you think?

4. Check out the Web site for The World At Night. See if you can find photos of the night sky in your part of the world.