Earth’s first satellite

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Presentation transcript:

Earth’s first satellite The Moon Earth’s first satellite

The Moon Since the moon is not a star, it can’t produce its own light Instead, moon is a satellite (orbits Earth) Light we see is reflected sunlight

The Moon Did you know… The moon is ‘egg-shaped’? The moon moves 3.8 cm away from us each year? Earth’s gravity causes ‘moonquakes’? More than 400 trees are planted in the U.S that were germinated on the moon

The Moon Did you know… The moon was created when a rock the size of Mars struck Earth as the solar system formed – about 4.5 billion ya. We see the same side of the moon all the time…here’s why…

Lunar Orbit The moon rotates once on its axis every 29.5 days The moon takes the same 29.5 days to circle the Earth (its orbital period) Since the two times are the same, it means we see the same face of the Moon all the time

Phases of the Moon Total Lunar Eclipse - February 20, 2008

Name the Phases “waxing” means getting bigger “waning” means getting smaller

Phases of the Moon Teacher’s Domain “Phases of the Moon” YouTube “Phases of the Moon 3D animation” and Bill Nye

Tides The moon’s gravity exerts a pull on Earth The ocean directly in line with the moon is pulled slightly toward it – a high tide The opposite side of the Earth also gets a high tide because the planet is being pulled toward the moon, as well.

Tides Spring tides – when Sun and moon are aligned Neap tides – when Sun and moon are not aligned

Tides What do tides look like on Earth?

Eclipses Lunar Eclipses When moon moves into Earth’s shadow (Full Moon) Not every month – orbital planes have to line up Happen 2 - 4 times per year Everyone on night side of Earth can see it

Eclipses Lunar Eclipses Moon glows red because indirect sunlight is filtered by our atmosphere (filters out blue light)

Lunar Eclipse from the moon

Eclipse Geometry

YouTube videos “What causes an Eclipse of the moon” “Total Lunar Eclipse - February 20, 2008”

Eclipses Solar Eclipses When moon moves between the Sun and Earth’s (New Moon) Moon blocks out some or all of the Sun’s light Happens rarely Very small area affected

Solar Eclipse

Eclipses Solar Eclipses Can be partial if moon blocks a portion of Sun’s light

Solar Eclipse on Earth Area of ‘totality’