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Image of the Moon and Earth
Image of the Moon and Earth
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Moon: NASA's Lunar Portal
Moon Facts
Moon Fact
Moon Phase Simulator

Interested in learning more about the phases of the moon?

Try the University of Nebraska's Lunar Phases Simulator.

EYES on LADEE: Explore the Moon in 3D
Moon Facts
Perfect Crater

Linné crater is extremely young, and to a scientist's eye pretty close to perfect. Linné is a beautifully preserved young mare crater.

NASA's Planetary CSI: Crater Science Investigations: Linné Crater

Shaping the Moon

Between 4.5 and 4.3 billion years ago, a giant object hit the moon near its south pole and formed the South Pole-Aitken Basin, one of the two largest proven impact basins in the solar system.

Two NASA LRO Videos: "Evolution of the Moon" and "A Tour of the Moon."

How the Moon Was Formed

The moon was formed ~4.5 billion years ago (about 30-50 million years after the origin of our solar system) out of debris thrown into orbit by a massive collision between a smaller proto-Earth and another planetoid, about the size of Mars.

Moon Gods

Most ancient religions had a moon god or goddess. One Roman moon goddess was named Luna, and this is why many modern words associated with the moon have "Luna" as their root.

Prince of Tides

There are two high tides and two low tides every day on every beach on Earth. This is due to the moon's pull.

Inverted Moon

As the astronomical telescope with its inverted image came into use, astronomers adopted the habit of representing the way they saw the moon -- upside down. This practice was followed until very recently. Lunar images are now constructed and stored digitally and can be displayed at any orientation. The moon is now typically shown right side up.

Earth Lashing

Every month when the moon gets a lashing from Earth's magnetic tail. This has consequences ranging from lunar "dust storms" to electrostatic discharges.

Moonquakes

There are two types of earthquakes that happen on the moon: deep moonquakes and shallow moonquakes.

Ancient Rocks

Moon-rock ages range from about 3.2 billion years in the maria (dark, low basins) to nearly 4.6 billion years in the terrae (light, rugged highlands). Active geologic forces, including plate tectonics and erosion, continuously repave the oldest surfaces on Earth whereas old surfaces persist with little disturbance on the moon.

Hot Rocks

All moon rocks originated through high-temperature processes with little or no involvement with water.

Out of Shape

The moon is not round, but is in fact egg-shaped with the large end pointed towards Earth.

Familiar Face

Only about 59 percent of the moon's surface is visible to us here on Earth.

Moon Phases

Full moons occur every 29.5 days. The moon keeps the same side to us, but not always the same face. Because of the tilt and shape of its orbit, observers see the moon from slightly different angles over the course of a month.

The Moon's Earth-like Core

Research suggests the moon possesses a solid, iron-rich inner core with a radius of nearly 150 miles and a fluid, primarily liquid-iron outer core with a radius of roughly 205 miles. Where it differs from Earth is a partially molten boundary layer around the core estimated to have a radius of nearly 300 miles.

Long Gone

There are no active volcanoes on the moon now. The moon's volcanoes have been extinct for billions of years.

One Small Step ...

In 2009, a NASA team restored the first grainy video of Neil Armstrong's first step on the moon.

Earthrise

Seeing the Earth rise from the moon never gets old.

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