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What is a Light Year?

http://janus.astro.umd.edu/astro/distance/. What is a Light Year?. If you could travel to the closest star from the sun in a car traveling 60 mph, how long would it take you to get there?. http://janus.astro.umd.edu/astro/distance/. 48 million years.

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What is a Light Year?

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  1. http://janus.astro.umd.edu/astro/distance/ What is a Light Year?

  2. If you could travel to the closest star from the sun in a car traveling 60 mph, how long would it take you to get there? • http://janus.astro.umd.edu/astro/distance/

  3. 48 million years

  4. If you could travel to the closest star from the Earth in a space shuttle at 18,000 mph, how long would it take you to get there?

  5. 160,000 years

  6. If you ride on a beam of light, how long would it take you to get there? It travels 300,000,000 m/s • http://janus.astro.umd.edu/astro/distance/

  7. 4.29 years

  8. Why do we use Light Years? • Because distances in space are too vast (big), miles and kilometers are too small to be used. • Scientists measure the distances in space outside our solar system in lightyears (ly)

  9. The MilkyWay is the galaxy in which the Solar System is located. The Milky Way Galaxy is about 100,000 light years across http://www.youtube.com/watch?v=0fKBhvDjuy0&feature=player_embedded

  10. One light-year is the DISTANCE that light travels in oneyear What is a Light Year?

  11. If we are going to find out HOWFAR a Light Year is, we need to know two things… • The speed of light, measured in meters per second and • The number of seconds in a year

  12. What’s the fastest speedin the universe? - The Speed of Light What is the speed of light? (abbreviated “c”) 300,000,000 meters per second or 3 X 108 m/s

  13. How Many Seconds in a Year? 60 seconds per minute X 60 minutes per hour X 24 hours per day X 365.25 days per year = the number ofseconds per year 31.55 million

  14. So How Far is a Light Year? 9,500,000,000,000,000 meters. This said out loud is.. That’s NineQuadrillion, Five Hundred Trillion Meters

  15. What is this in scientific notation? 9,500,000,000,000,000 meters. In scientific notation, this is 9.5 x 1015 m

  16. Practice!

  17. More Practice!

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