Earth’s Moon aka. Luna

How does the moon affect the earth?

How far away is the MOON?

• 380,000 km (about 239,000 miles)

What is a SATELLITE?

• A natural or man made object that revolves around a planet

• (A natural satellite is a MOON)

What is the moon doing out in space?

• Revolving around the Earth in a counterclockwise direction

• Rotating on its axis as it goes around the Earth

Where did the Moon

come from?

Giant Impact Theory

• Earth struck by large body, size of Mars.

• Part of body + Earth flung into space.

• Captured by gravity of Earth.

What is Gravity?

• Natural phenomenon by which all physical bodies (anything with mass) attract each other

• holds celestial bodies together

• keeps celestial bodies in orbit

What effect does the moon have on Earth?

• Tides- • rise and fall of water levels due to gravitational forces

• Occur twice a day (2 high tides, 2 low tides)

http://home.hiwaay.net/~krcool/Astro/moon/moontides/

high tide

low tide

How are Tides created?

• (3 ways)1. Because the Earth

and the moon are attracted to each other

http://home.hiwaay.net/~krcool/Astro/moon/moontides/

Moon and earth are attracted to each other by gravity

Tides are also created by:

•2. the rotation of the earth,

•3. and the sun’s gravity

The sun can raise the tides, too

Spring Tides

Tides are not waves!

What are Spring tides?

• Tides that produce the greatest difference between high and low tides—The biggest tides

• Occur twice a month

When do spring tides occur?

• Once at the full moon and once at the new moon

• When the sun moon and earth are nearly in a lineSpring Tides combined with big storms

The sun can raise the tides, too

Spring Tides –the sun

and the moon line up

What are NEAP Tides?

• Tides that produce the least difference between high and low tides—The smallest tides

• Occur twice a month

When do neap tides occur?

• Once at the first quarter and once at the third quarter

• When the sun moon and earth are at right angles to each other

http://www.space.gc.ca/asc/eng/educators/resources/astronomy/multimedia/module3/tides/tides.swf

The neap tides –the smallest tides –when the sun and moon are at a 90 angle

•What other effects do we have from the moon??

The phases of the moon

http://www.astro.wisc.edu/~dolan/java/MoonPhase.html

• Moonrise from Earth: The moon rises and sets every day, appearing on the horizon just like the sun. The time depends on the phase of the moon. It rises about 30 to 70 minutes later each day than the previous day, so the moon is out during daytime as often is it's out at night. At the time of the new moon, the moon rises at about the same time the sun rises, and it sets at about the same time the sun sets. As the days go by (as it waxes to become a crescent moon, a half moon, and a gibbous moon, on the way to a full moon), the moon rises during daytime (after the sun rises), rising later each day, and it sets at nighttime, setting later and later each night. At the full moon, the times of moonrise and moonset have advanced so that the moon rises about the same time the sun sets, and the moon sets at about the same time the sun rises. As the moon wanes (becoming a half moon and a crescent moon, on the way to a new moon), the moon rises during the night, after sunset, rising later each night. It then sets in the daytime, after the sun rises. Eventually, the moon rises so late at night that it's actually rising around sunrise, and it's setting around sunset. That's when it's a new moon once again.

http://www.harcourtschool.com/activity/moon_phases/