- Light travels at a speed of 18,000,000 km/minute. Venus is 6.0 light minutes away from the sun. Calculate how many miles Venus is from the sun.
- Light travels 9.46 trillion (94,600,000,000) kilometers a year. The North Star is 40,772,600,000,000 kilometers away. How many light years is that?
- You are on an imaginary planet that is 141.9 trillion kilometers away from Earth. You are looking through a very high-powered telescope, and you witness a child's fifth birthday party. How old is that child on Earth at the time you are watching the child's fifth birthday party? (Hint: Calculate the number of light years this planet is from Earth.)