the side of the moon that faces away from the sun. We see it when there is a "new moon" the moon looks totally black, because it's not reflecting the sun towards the earth, (because we're looking at what would be considered the back of the moon)

i have never thought of that let me think ................................................................... ok honest i have no clue

When you only see some of the moon. It's all really there, some of the moon is in the dark. It refers to not being able to see all that is truly there.

The other side of the moon that we don't see. When spaceships travel behind it, all communication is lost. It is cold and desolate.

Actually I just wanna add to Nikrel's answer a little bit. The moon rotates at a speed so that it actually only faces us on one side at all times. A new moon is when the light from the sun is blocked by the earth and the moon looks dark but it is still the same side of the moon. The dark side always faces away from us no matter what phase the moon is in.

There are a lot of misconception being passed on here that need to be cleared up. First of all, as Adrian wrote, the Moon rotate at the same rate that it orbits the Earth. Thus it keeps the same face point at us at all times. Because of this the portion of the Moon that is lit by the Sun changes on a monthly cycle in time with the Moon's orbital cycle. So, the "dark side of the moon" shifts as the Moon goes around us. Thus, during the new moon, when the Moon is between us and the Sun, the near side of the Moon is in its shadow and the far side is fully lit by the Sun. As the Moon continues around us, keeping the same face pointed towards us, the portion that is lit changes with the changing orientation. So, about two weeks after the new moon, the Moon is on the opposite side of the Earth from the Sun. At this point it is now the near side of the Moon that is fully lit and the far side that is now in the Moon's shadow. As this cycle continues, all sides of the Moon eventually get the same amount of sunlight over the course of the month. So, there really is no one "dark" side of the Moon. There is just the near side of the moon and the far side of the Moon. Additionally, since all sides of the Moon get the same amount of sunlight, it is really not correct to say that one side is necessarily colder than the other side, unless you are referring to the night side as opposed to the day side. When it is night on the far side, then it will be colder than it is on the near side. However, when it is day on the far side it will be hotter than the near side. Finally, to those others whose answers I criticized here. Please don't take personally. This is on of the things that annoys me. All of these misconceptions about some as basic as what causes the phases of the Moon is a sign of just how bad of a job our public schools are doing when it comes to teaching science. So, my beef is not with those of you who gave incorrect answers. It is with the whole public school establishment that did not educate you properly.

The dark side refers to the side that does not recieve visible light, therefore, leaving it unseen. The light side is the side that we see, if that helps.

Generally, it refers to that which is unknown, as it is the side which cannot be seen. The term "dark side" itself refers to things hidden from others, the unseen and less benevolent aspects of a thing (e.g. someones dark side). Aside from the deeper discussion on things scientific which have been taking place in response to this question, I'd like to be the one to mention that this phrase commonly refers to the #2 best selling album in the world, Pink Floyd's 1973 release "Dark Side of the Moon", which has spent an unbelievable 14 years on the Billboard 200 album chart, longer than any other album in history. It has also remained on the Billboard charts altogether for 29 years, setting another record. It is frequently ranked by music critics as one of the greatest and most influential albums of all time. The Dark Side of the Moon explores the nature of the human experience. For example, "Speak to Me / Breathe" is about birth and being a child with new earthly experiences. "Time" deals with growing older and the overwhelmingly fast approach of death - youth being gone before one even realizes it. "The Great Gig in the Sky" deals with thoughts of death and religion, "Money" deals with consumerism with tongue-in-cheek lyrics and wealth-related sound effects. "Us and Them" deals with conflict, ethnocentrism, and the belief that a person's self is "always in the right".[5] "Brain Damage" and "Eclipse" deal with growing too old to be who one once was, and finally, death. Roger Waters wrote all of the lyrics in the album and created the early demo tracks in a small garden shed-turned-recording studio at his home. It was in there he also created the intro to "Money" by experimenting with dropping a range of monetary objects. All four members of Pink Floyd, which included guitarist David Gilmour, drummer Nick Mason, bassist and lyricist Roger Waters, and keyboardist Richard Wright, had some form of participation in the writing and production of the album, which is a rarity among later Pink Floyd albums. However, it is the first of five consecutive Pink Floyd albums with lyrics completely credited to Roger Waters. Although The Dark Side of the Moon was the planned title of the album, upon the discovery that the band Medicine Head was to release an album of the same name in 1972, the year prior to The Dark Side of the Moon's release, the band changed the album's title to "Eclipse: A Piece for Assorted Lunatics". However, the Medicine Head album flopped, so Pink Floyd reverted to the original title. The only time there is a gap of silence on the whole album is between "The Great Gig in the Sky" and "Money", where there is a side change on the LP. http://en.wikipedia.org/wiki/The_Dark_Side_of_the_Moon

where the moon keeps it's secrets.

It's an awesome album by Pink Floyd!

dunno but its one of the best albums ever!