1. The EARTH is 93 Million Miles from the SUN.

2. Distances in our Solar System are measured in ASTRONOMICAL UNITS (AU).

3. 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

4. A LIGHT YEAR IS THE DISTANCE LIGHT TRAVELS IN ONE YEAR!!!
LIGHT YEARS
distance!!!
IS A MEASURE OF
A LIGHT YEAR IS THE DISTANCE
LIGHT TRAVELS IN ONE YEAR!!!

5. 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!

6. Scientist use LIGHT YEARS because STARS are too far away from each other to use…
feet
feet
meters
inches
kilometers
astronomical
units
miles

7. 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!

8. One LIGHT YEAR is 10,000,000,000,000,000 meters or 16 10 X 10 meters
Five Light Years = 5 x 1016 meters

9. It takes 43 (human) years for the light from this star to reach earth!
43 Light Years from EARTH
It takes 43 (human) years for the light from this star to reach earth!
By the time you see the light 43 years have passed.
The light was created before most of your parents were born.

10. Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
If a star is 43 light years away, that means light has been traveling 43 years from that star to Earth That means this light started traveling before most of your parents were born