This is a little bit nerve-wracking, although it's exciting.

It's a little nerve-racking even though it's exciting.

First we have to get it into orbit, which is not an easy task.

It's going to be difficult to get it into orbit. Mars is hard, Mars can be unpredictable, but we've got a good team here.

Mars doesn't treat you very well, for the most part. So this is a very challenging thing to do.

This mission will greatly expand our scientific understanding of Mars, pave the way for our next robotic missions later in this decade and help us prepare for sending humans to Mars.