1. Scientific notation

2. Learning goals We are learning to measure distances in space.
We are learning to write large and small numbers in scientific notation.

3. Vast distances
Scientists have developed special units of measure

4. Astronomical unit (au)
1 AU = 150 million km
average distance between Earth and Sun

5. Light year used for celestial objects outside our solar system
the distance a beam of light can travel through space in one year
one ly = AU = km

6. converting
Use a scale to set up.
Cross multiply and divide.

7. Convert the following numbers to Astronomical Units.km km km km
4.7 x 1012 km

8. Convert the following numbers to km.
5.2 A.U.
0.6 A.U.
23.7 A.U.
0.08 A.U.
128.1 A.U.

9. Scientific notation
helps to make very large numbers shorter and easier to deal with
based on powers written using the base number 10
results in 3.21 x 1011

10. recipe
The speed of light is about m/s. Write this in scientific notation.
Step 1: Put a decimal point so you have a number that is between 1 and 10.
Step 2: Delete the trailing zeros.
Step 3: Multiply by base 10.
Step 4: Count the number of places you moved the original decimal. This is the exponent on the base 10.

11. Try these
The distance from the Sun to the nearest star is km.
The average distance from Earth to the Sun is m.
The distance from the Milky Way to the farthest galaxies: ly.
The total number of celestial objects in the solar system:
The mass of the Sun: kg
The age of the Earth: years.

12. View of deep space taken by hubble space telescope

13. Please complete activity
All These Worlds

14. Learning goals We are learning to measure distances in space.
We are learning to write large and small numbers in scientific notation.