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Lesson 13. Moon and its phases 2022.pptx
- 1. SCIENCE
- 2. The Moon L e s s o n 1 3
- 3. The Lunar Surfaces L e s s o n 1 3 . 1
- 4. Our Moon has been admired for thousands of years, and because of this is one of the most familiar astronomical objects to children of all ages.
- 5. What is the Moon? A natural satellite One of more than 96 moons in our Solar System The only moon of the planet Earth
- 6. Location, location, location! About 384,000 km (240,000 miles) from Earth 3,468 km (2,155 miles) in diameter (about 村 the size of Earth)
- 7. Major divisions of the Lunar interior Crust - average thickness of about 70 kilometers Mantle Core - radius is between 300 and 425 kilometers
- 8. The Moons Surface No atmosphere No liquid water Extreme temperatures Daytime = 130C (265属F) Nighttime = -190C (-310 F) 1/6 Earths gravity
- 9. Lunar Features - Highlands Mountains up to 7500 m (25,000 ft) tall Rille (trenchlike valleys) Also known as the lunar terrae, which is Latin for land)
- 10. Lunar Features - Craters Most formed by meteorite impact on the Moon
- 11. Lunar Features - Maria Originally thought to be seas by early astronomers Darkest parts of lunar landscape
- 12. Far Side of the Moon First seen by Luna 3 Russian space probe in 1959 Surface features different from near side More craters Very few maria Thicker crust
- 13. Movements of the Moon Revolution Moon orbits the Earth every 271/3 days The moon rises in the east and sets in the west The moon rises and sets 50 minutes later each day Rotation Moon turns on its axis every 27 days Same side of Moon always faces Earth
- 14. The Tides Tides caused by pull of Moons gravity on Earth High tide Side facing Moon and side away from Moon Every 12 hours, 25 遜 minutes Low tide On sides of Earth
- 15. Exploring the Moon 1950s to 1960s - probes Neil Armstrong First man on the Moon July 20, 1969 Six Apollo missions (1969-1972) 382 kg (842 lbs) rocks 12 Americans have
- 16. SCIENCE
- 17. Phases of the Moon L e s s o n 1 3 . 2
- 18. Its Just a Phase Moonlight is reflected sunlight Half the moons surface is always reflecting light From Earth we see different amounts of the Moons lit surface The amount seen is called a phase
- 21. new moon The moon is not visible in the sky. waxing crescent The lighted side of the moon slowly becomes visible.
- 22. first quarter The lighted area appears as half moon. waxing gibbous The lighted side is shaped like an egg.
- 23. full moon The complete lighted side of the moon visible in the sky. Earth is then somewhere between the moon and the sun.
- 24. Earth during the new moon phase and the full moon phase
- 25. waning gibbous More than half of the moon is visible. The lighted area appears to grow smaller. last quarter Half of the moon is lighted.
- 26. waning crescent Small portion of the moon is lit but most of the surface is dark.
- 28. Lunar Eclipses Moon moves into Earths shadow this shadow darkens the Moon Umbra Penumbra About 2-3 per year Last up to 4 hours
- 29. Solar Eclipses Moon moves between Earth and Sun Moon casts a shadow on part of the Earth Total eclipses rare only once every 360 years from one location!