Love Space Center Houston!  Astronauts!
Yes it is huge! It is 250,000 square feet so that is a lot of Space Center!
So, what are they doing there these days?
There is always something different going on, they have traveling exhibits so you can check out new things in addition to the 400 space artifacts.
Are they training and preparing for a Mars mission
I am sure they are, The Johnson Space Center is the hub for Mission Control and Astronaut Training.
So what space artifacts could I see there?
You will have to go and check it out! There are more than 400 artifacts to see.
Wow!  Maybe like moon rocks?????
Yes, you have seen a moon rock before? It would be cool to see an actual piece collected during the course of human exploration on the moon.