going to mars

That probably sounds __________, but I guarantee you that some of your children will end up living on Mars.

We are incredibly vulnerable to the __________ of our own galaxy.

A single, large asteroid could _________ us _______ forever.

Think what a tragedy it would be if all that humans have accomplished were suddenly __________.

wo million years ago humans evolved in Africa and then slowly but surely spread out across the entire planet and they __________ doing that.

Yes, we could do a lot of good with the money it will take to establish a __________ colony on Mars.

I worry we could __________ _________ Mars the way we've done it with Earth.

So let me tell you about the extraordinary adventure we're about to ___________.

Some ___________ think if we got there by 2050, that'd be a pretty good achievement.

Dava Newman, a scientist at MIT, has created this __________ space suit.