1. Topic: Light Years
Essential Question: How do scientists use light years to measure distances in our universe?

2. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Astronomical Unit (AU)
Used to measure distances in our solar system
about 93 million miles which is the Earth to the Sun

3. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Light Year
The distance that light travels in one year
Light travels at the fastest speed known in the universe
It can go around the Earth 7 times in 1 second!

4. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Light year Scientists use light years because stars are too far away to use: meters, kilometers, AU (Astronomical Unit)
One light year is 10x1016 meters long
That’s 5.8 trillion miles!

5. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
If a star is 14 light years away, that means light has been traveling 14 years from that star to Earth That means this light started traveling when most of you were born

6. Now take some time…
Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything:
Essential Question: How do scientists use light years to measure distances in our universe?

7. Time to use the left hand column
You will now write your own questions using the verbs provided.

8. Astronomical Unit (AU) Used to measure distances in our solar system
Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Choose one verb to write your question:
Define
Describe
Astronomical Unit (AU)
Used to measure distances in our solar system
about 93 million miles which is the Earth to the Sun

9. The distance that light travels in one year
Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Choose one verb to write your question:
Define
Describe
Light Year
The distance that light travels in one year
Light travels at the fastest speed known in the universe
It can go around the Earth 7 times in 1 second!

10. One light year is 10x1016 meters long That’s 5.8 trillion miles!
Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Choose one verb to write your question:
Define
Describe
Explain
Light year Scientists use light years because stars are too far away to use: meters, kilometers, AU (Astronomical Unit)
One light year is 10x1016 meters long
That’s 5.8 trillion miles!

11. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Choose one verb to write your question:
Define
Describe
Explain
If a star is 14 light years away, that means light has been traveling 14 years from that star to Earth That means this light started traveling when most of you were born

12. Time to use the left hand column
You will now write your own questions using the verbs provided.

13. Now let’s write a summary
Look at each question you wrote on your own, and answer each question in a complete sentence.