Earthrise from lunar orbit, Apollo 8'

1

• Earthrise from lunar orbit, Apollo 8.
• Notice the terminator, the dusk/dawn line on
  Earth.

2
IQ

• Skepticism plays no role in science.
• T
• F

3
IQ

• False!
• Every scientist is a skeptic who believes a
  claim, statement, proof or discovery only if
  proven.

4
IQ

• What is the difference between a solar system and
  a galaxy?
• A. They are actually the same.
• B. A solar system has planets orbiting a single
  star, and a galaxy is billions of stars.
• C. There is only one solar system, but lots of
  galaxies.
• D. An entire solar system is much bigger than a
  galaxy.

5
IQ

• B. is the answer!
• A solar system consists of a planet or planets
  orbiting a single star. A galaxy is MUCH bigger,
  consisting of perhaps several hundred billion
  stars!

6
IQ

• The astronomical unit (AU) is
• A. The average distance from the Earth to the
  moon.
• B. The time it takes for light from the sun to
  reach us.
• C. The diameter of the Earth.
• D. The average distance between the sun and the
  Earth.

7
IQ

• D. is the answer!
• The astronomical unit is the average distance
  between the sun and the Earth, and is the
  yardstick we use to measure distances in the
  solar system.

8
IQ

• During summer the Earth is closer to the sun.
• T
• F

9
IQ

• False!
• The Earths orbit around the sun is very nearly
  circular. However, during the summer the Earth is
  actually slightly farther from the sun than
  during winter.
• During summer the Earths northern hemisphere is
  tilted towards the sun, resulting in more direct
  heating!

10
IQ

• Hey, I asked, cant someone do something about
  all those big numbers?
• Yes
• No

11
IQ

• The correct answer is Yes!
• As a special two-time offer, if you ask your
  professor about big numbers within the next 60
  minutes, you will learn how to manipulate big
  numbers fearlessly - at no additional cost!
• Remember to ask now! This offer wont last
  forever!
• No more ginsu knives, either.

12
Remember!

• As a courtesy to other students, the professor,
  and to keep us from getting kicked out of here
• No eating or drinking anywhere in the LodeStar
  Astronomy Center
• Turn off cell phones during class