Post on 31-Dec-2015
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Periodic Familes and MOY 02/07
Agenda:
1. Warm Up2. Correct quizzes3. 45 minutes for project4. HR Diagrams and MOY
review5. Light Years
Please pick up the warm up and answer the FIRST question
The EARTH is 93 Million Miles from the SUN.
Distances in our Solar System are measured in ASTRONOMICAL UNITS (AU).
IS A MEASURE OF
A LIGHT YEAR IS THE DISTANCE
LIGHT TRAVELS IN ONE YEAR!!!
Scientist use LIGHT YEARS because STARS are too far away from each other to use…
One LIGHT YEAR is
or
1 year 1 year 1 year 1 year 1 year
1 x 1016 1 x 1016 1 x 10161 x 1016 1 x 1016
Five Light Years = 5 x 1016 meters
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.