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Uncle Milton's Solar System in my Room is a battery operated mobile of the solar system to hang from your ceiling. It has a large sun ( I am guessing 10") which lights up and eight planets which rotate on wire hangers around the sun. The planets vary quite a bit in size, and if not exact, are at least close to scale. Mercury is smaller than a marble and Jupiter just smaller than a tennis ball. Of course the sun would be much larger on a true scale model. This come disassembled but is very easy to put together. A white plastic circle base plate very much like the ones used to hang smoke detectors needs to be securely attached to the ceiling, using the screws which come in the box. You then quickly attach the planets to the rings put in batteries and screw onto base plate. We finished this in a matter of minutes, with my 6 year old son helping. I do not know if our box was faulty, but we did not receive any instructions for assembly. It was straight forward enough, though. We assumed that the wire rods for the planets would be placed in order, from shortest to longest, and this worked quite well. We did know the correct order to place the planets anyway, but let on we didn't so my son could be in charge of that. Once up this looks very nice and makes a lovely addition to our computer / play room. The children enjoy playing with the remote and making the planets move around. Unfortunately, there are only two rings for the planets to attach to, so two orbits with the planets moving in groups of four, but it still looks very nice. We also have a collection of model airplanes suspended from the ceiling so the overall effect is very pleasant. This does make a loud motorised sound when in motion, but I still think this would be something a baby would enjoy watching. If the noise does not put the child off, it might be nice to hang over a bed where a child could watch it while drifting off to sleep. As it has a remote control, it makes a nice little light a child could turn on and off at night as they please. I do have a few complaints about the mobile though. The first is that even using duracell batteries, the light from the sun is very dim. The second is that rather than make a model of Saturn complete with rings, they just give you a paper ring to tape around it. At £25.57, I would expect a bit better. Even the cheap sets of planets have a plastic ring around Saturn. The remote control is meant to have a built in light pointer, but I only just noticed this when writing this review. As far as I know, it has never worked. Finally the cd that comes with this is horrid. It is meant to teach children about the stars but the woman narrating this has one of those voices which make you think of nails down a chalkboard. The sun is described as the brightest star in the sky - somehow I doubt that very highly. She is also very condescending, describing the solar system as " a bunch of stuff"..... a bunch of "stuff" indeed as I won't use the other word which springs to mind. I did consider giving this to the boys as Frisbee, but decided against it in case they end up using more valuable discs in the future, like my husbands PS3 collection. This requires 5 batteries, I believe 3 AA's and 2 AAA's. We have had this up for about 3 months and have not changed the batteries yet, but it is never left on for any period of time. I am happy with this mobile and so are my sons. However, I think the solar system model in my son's bedroom looks better, although it does not move. He simply has a yellow up-lighter for the sun and a set of plastic planets on fishing line. I have decided on a rating of 4 stars then losing one because I would have expected more then a paper ring on Saturn for this price, and also the noise is a bit annoying. But I am still happy enough to recommend this as a lovely addition to a child's room.