Transcript Light Year - Cloudfront.net

Topic: Light Years
Essential Question: How do scientists use light
years to measure distances in our universe?
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
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!
•the speed of light = 299 792 458 m / s
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!
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
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?
Time to use the left hand column
• You will now write your own questions using
the verbs provided.
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
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!
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!
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
Time to use the left hand column
• You will now write your own questions using
the verbs provided.
Now let’s write a summary
Look at each question you
wrote on your own, and
answer each question in a
complete sentence.