4. Solar System
• There are around 100,000,000,000 (one
hundred billion) galaxies in the universe
• One, the galaxy surrounding the star known as
the sun, is known as the solar system
http://solarsystem.nasa.gov/planets/profile.cfm?Object=SolarSys
6. Fun Facts- Earth’s Orbit
• Orbit around the sun-
149,598,262 km
• Orbit circumference-
939,887,974 km
• Average orbit velocity-
107,218 km/h
7. Fun Facts- Earth
• Mean radius- 6,371.00 km
• Equatorial circumference- 40,030.2 km
• Volume- 1,083,206,916,846 km3
• Mass- 5.9722 x 1024 kg
• Surface Area- 510,064,472 km2
13. Are You Smarter than a 5th Grader?
• Why is there “day” and “night”?
• Why does the sun rise in the east and set in
the west?
• Why is the day length not the same
everywhere on the planet?
17. Key Question
• So far, the only place in the universe where we
know life is found if the Earth
• What characteristics of Earth allow life to
exist?