They may like to see a "real" telescope (try and have the parents there at this time) many of them have not seen one

.
Kids like volcanoes and crators so some time spent on those should go well relating them to the surface of the Moon.
One feels compeled to leave them knowing something but how do you shorten this story

.. so may I suggest to try and leave them with impressions of the interesting things that are out there...
I find telling them that stars blow up brings difficult questions from immediate worry as to when our Sun will blow up (at least do not say the Sun is a star if you mention super nove). Kids focus on some things and some worry about their future.
They seem to like the prospect of different worlds and what creatures may live there so maybe give them some ideas as to the variety of worlds we now know about.
Good luck

... remember they instantly will look up to you, give them solid answers not a selection of possibilities scientists are still considering.
The Moon came from one place

..thats it

. Keep it very simple.
IF saying you dont know you could remind them there are many discoveries still awaiting someone to work on them.
alex