Little children have a natural fascination with the moon and the stars, and summer is a great season to grab a blanket and do a little stargazing.
First- find a good place to stargaze. If you're in a bright city, this might mean waiting for a long weekend in the country. Once you've seen the stars from out in the country, you'll realize that what a difference it makes.
If your kids are old enough, grab a few constellation charts and try to find them. If looking at the stars seems like a hobby the whole family enjoys, you might want to consider investing in a decent telescope so you can actually see some of the planets or the craters on the moon.
Once you've gone stargazing, you can continue to foster an interest with glow in the dark stars, books about the stars, or a trip to a planetarium.
Thanks for the tips Nature Moms.