1) Write 1250000000 in Scientific Notation.

2) Write 0.0000056 in Scientific Notation.

3) Write out 6.798*105 and 3.458*10-8.

4) Uranus is 19AU away from the sun.
 a. How far away is it in meters?
 b. How far in centimeters?
 c. How many parsecs?

5) It takes 8 minutes for light to travel from the sun to us, how far away is the sun in
meters? (light travels at 3.08*1010cm/s).

6) The center of the galaxy is 8kpc (kilo parsecs) away, How many light years is that?
How many meters?

7) San Francisco is 10km from Berkeley, if they turn on the lights of the Trans America
building when do I see it in Berkeley?

8) The Observable universe is 1028cm across, How long does it take light to cross it?

9) Why do we have different units and why don’t we measure everything in cm?

10) Bonus, If  you wanted to reach the center of the galaxy in your lifetime (say its 50
years), How fast would you have to go? Is that possible?

ANSWERS:
1) 1.25*109
2) 5.6*10-6
3) 679,800 and 0.00000003458
4) 2.85*1012m, 2.85*1014cm, 9.22*10-5pc
5) 8min*c=1.44*1011m
6) 8kpc=8000pc=26,080 ly = 7.824*1012m
7)10km/c=10,000m/c=3.33*10-5s
8)3.33*1017s = 1.05*1010yrs
9)Because some units are better for some measurements than others.
10) 7.824 *1012m/50yrs = 5,000m/s, So it is possible in our lifetime if you can maintain
a speed of 5,000m/s.