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analyzing astronomical images 5

evening is a warm, cloudless sky, reddish near horizon. Begin to see the first stars.

Above the lunar night ...

The moon, just rising, is drawn as a sickle over the western horizon with a faint glow in the dark.

start thinking about your partner, a romantic dinner ....

But ... a moment!!

How is it that is illuminated the night of the Moon? From where comes that light? and worse, because during the Fourth and not seen?.

Venus at any time does not show a glow similar to our moon.

If you plan on Mercury or Venus, for example, each night is black .... because the Moon?

things by name.

That night glow of the moon is called "Earthshine ."

The answer:

First we have to imagine how they are things located in the solar system, with the stars involved.

If there is light, the Sun must be included. The moon obviously too. As our planet revolves around, we also added to the Earth.

For further clarification, note the phases of the moon .

Diagram of the Earth - Moon and the Sun, shining from the left. The green line running through the moon is half of the Moon seen from Earth, which is marked "1."

As you see in the diagram above, the sun can not be, because it is the other side. Unable to shine directly on the lunar night.

only thing is the night side of the Moon is the Earth.

it should be .... and yes it is!

The blue arrows are the sunlight reflected by Earth.

light is reflected from our planet!
This value (the reflection of light by a body) is called albedo .
In the same way the moon lights up the night when the full Earth (Earth from the moon now looks like full!), Earth to the Moon also reflects sunlight, but much more because it is larger and its albedo is higher too.

And when in the room?

Sunlight can be reflected no more than 90 degrees, so that it can not illuminate beyond when the Moon is in fourth, and even so, the moon is so bright that by contrast, no Earthshine would be.

came your partner ... I was thinking? Ahhh! Where the phone to order pizza?