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What was the exposure time of this photo?

about 10 seconds

about 10 minutes

about 1 hour

about 8 hours

The length of stars trails is pretty much the same as the distance travelled by an hour hand of clock during 30 minutes. But the Earth rotates twice as slow compared to the hour hand of a clock (one rotation per day, while clock's hour hand makes two).

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World's fastest high-speed cameras were built to take photos of specific objects. What kind of objects?

rocket launches

nuclear bomb explosions

What are the most luminous objects in the universe?

supergiant stars

What is the highest time zone?

Which direction was the camera pointing at while taking this picture?