are you familiar with Elon Musk?
I have heard of it.  Is there more you can tell me about it?
He is the developer of SpaceX Exploration
What does SpaceX exploration do?
They use three orbital lauch sites to send aircraft into space for reshearch
oh wow.  I enjoy learning about space, we've learned so much in the past 10 years.
Elon Musk founded SpaceX in 2002 and has been working vigorously on space exploration
are there any major milestones in their history?
The SpaceX reusable luanch system was funded by Elon Musk and can be used repeatedly
That is really interesting.  I'll have to look him up and read more about him.