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The Earth's one natural satellite, the Moon, is more than one quarter the size of Earth itself (3,474 km diameter). Because of its smaller size, the Moon's gravity is one-sixth of the Earth's gravity, as we saw demonstrated by the giant leaps of the Apollo astronauts.
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www.windows.ucar.edu/tour/link=/earth/moons_and_rings.h...
www.windows.ucar.edu/tour/link=/earth/moons_and_rings.html
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The Earth may only have one Moon, but it's a big one! The Earth's Moon is the fifth largest in the whole solar system. But it is still smaller than the Earth, so objects weigh less on the Moon than they do here. That's why the astronauts could enjoy bouncing around on the lunar surface.
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www.windows.ucar.edu/tour/link=/earth/moons_and_rings.h...
www.windows.ucar.edu/tour/link=/earth/moons_and_rings.html&edu=elem
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Moon - Wikipedia, the free encyclopedia
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The Moon is Earth's only natural satellite and the fifth largest satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is 384403 kilometer, about thirty tim...
en.wikipedia.org/wiki/Moon
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Allows users to view the earth and moon from many vantage points and in multiple way ... Welcome to Earth and Moon Viewer. ... To use the Earth and Moon Viewer, you need a graphical Web browser with forms support and the ability to display GIF and JPEG images.
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www.fourmilab.ch/earthview/vplanet.html
www.fourmilab.ch/earthview/vplanet.html
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Moon/Earth Comparison ... Orbital parameters (for orbit about the Earth) ... The orbit changes over the course of the year so the distance from the Moon to Earth roughly ranges from 357,000 km to 407,000 km.
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nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
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Excellent resource for in-depth information about the Earth's Moo ... The Moon, of course, has been known since prehistoric times. It is the second brightest object in the sky after the Sun. As the Moon orbits around the Earth once per month, the angle between the Earth, the Moon and the Sun changes;
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www.nineplanets.org/luna.html
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General information, some statistical data and links. ... The interaction of the Earth and the Moon slows the Earth's rotation by about 2 milliseconds per century. Current research indicates that about 900 million years ago there were 481 18-hour days in a year.
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www.nineplanets.org/earth.html
www.nineplanets.org/earth.html
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An interactive model of the motions of the Earth, Sun and Moon for children aged 9-10. ... Skip to main content ... Text only version of this page...
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www.bbc.co.uk/schools/scienceclips/ages/9_10/earth_sun_...
www.bbc.co.uk/schools/scienceclips/ages/9_10/earth_sun_moon.shtml
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