Lucky kid! I wish I had a telescope myself, great hobby.
The photograph has some wonderful aspects to it as well as filling the challenge. I like the 'dad helping child' sentiment to it as well as the instant feeling of wonder I get when I put myself in the photo and think about looking through a telescope. So the idea and emotion of the image are great!
There are a few technical issues with the photograph that could use a little work. The main one is lighting. There is a odd tone to the image that I see often when I'm doing pictures indoors myself, that may come from insufficient light. The focus is also rather soft, this could relate to the lighting issue as well.
I gave this photo a 4 because there is quite a bit of potential to it, just a few technical aspects that need work. I really like the emotion tied to it.