Do you think it's going to be a problem if I don't let my son go to space camp with his father?
It might be. Why don't you want him to go to space camp with his dad?
He hasn't been visiting him regularly and I don't want our son to think his father has changed and he just ends up disappointed again.
You have an issue with your husband and the way he conducts himself, not with your son. It is not right to punish your son for your husband's shortcomings. Send your son to space camp.
I don't think it's a good idea. Our son will think his dad is back in his life and it will break his heart when he disappears again.
This sounds like a difficult situation, but let your son go to space camp with his dad. I'm sure he'll have a great time and maybe his father will decide to be more involved as a parent after the camp.