The Earth in Space

1
The Earth in Space

• Chapter 1, Section 2

2
The Solar System

• Solar System- Sun with 9 planets and other bodies
  revolving around.
• Earth 3rd planet from the sun.
• Orbit path traveled around the sun.
• - earth takes 365 ¼ days
• - pluto takes 250 years

3
Types of Planets

• Rocky (earthlike)
• - solid, mostly made of rock
• Gaseous (Jupiter, Saturn, Neptune, Uranus)
• - mostly made of gasses.

4
Sun, Earth, and Moon

• Sun- 93 million miles from Earth
• - 27 million degrees F
• - life cannot exist without
• Atmosphere layer of air surrounding Earth
• - made of Oxygen and Nitrogen
• - Holds in heat/ oxygen
• - keeps out solar radiation

5
Cont.

• Moon orbits earth
• - takes 30 days to complete orbit
• - no light/atmosphere

6
Earths Movement

• Axis earth rotates around, imaginary line
• - N and S poles
• - 1 day 24 hrs.
• Revolution complete orbit around the sun
• 365 ¼ days
• Leap year every 4 yrs due to ¼ years

7
Seasons and the Sun

• Earth is tilted 23 ½ degrees on its axis
• - causes seasons to change
• Suns direct rays provide more heat than indirect
  rays
• - indirect rays winter

8
Solstices and Equinoxes

• Summer Solstice June 21, sun directly over
  Tropic of Cancer (N Hemisphere)
• - longest day
• Winter Solstice December 22, sun directly over
  Tropic of Capricorn ( S Hemisphere)
• - Shortest day

9
Cont.

• Equinoxes when the day and night are equal.
  (Autumn and Spring)
• - March 21 and September 23
• - Sun directly over Equator