1. EARTH
3rd Rock from the Sun

2. Kick off space with YouTube
“Planet Earth (views from space)”

3. Earth FYI Earth’s axis is on a 23.5˚ tilt
Earth has a rotational period of 24 hours and an orbital period of days
(4 x 0.25 = leap year)
Earth’s surface is roughly 70% water

4. Day n’ Night
Hemisphere facing away from the Sun is in darkness; towards the Sun its daytime
Days get longer leading up to the summer solstice (June 21) and shorter after that

5. Seasons Earth is tilted Earth circles the Sun on an elliptical orbit
We are not closer to the Sun in summer – actually the opposite!
Parts of Earth receive varying light intensities

6. Seasons Earth is tilted (still)
Parts of Earth receive varying light intensities from Sun
When N. Hem. tips toward Sun - summer
When N. Hem. tips away from Sun - winter

7. YouTube “what causes the seasons on Earth?”