This is a CBSi on the world behind the black. Bob Zimmerman is here. He keeps behind the black watching SpaceX SpaceX

exploring and space engineering.

We begin with engineering because ULA, a company that I thought was for sale, has completed a Delta

4 heavy launch. Bob provides a photograph. It looks very impressive.

Bob, why do we need this launcher? What is it for? Good evening to him.

We don't need it anymore. John doesn't exist anymore. This is this very last lock.

You're a very impressive rocket until the not going to have

it came along.

It was the most powerful rocket piece in the United States.

I think it is a very impressive rocket, but it's also extremely expensive and cumbersome.

And so United Launch Alliance had this rocket, and it's a family of rockets, depending on how you

configure it, you can have different kinds of

delta fours. This is the most powerful version of the heavy.

And so ULA had this rocket and had the Atlas Five rocket.

And it was it's been in the process for the last few years

retiring both of those rockets to replace it with their Falcon Cento rocket

their Vulcan Cento rocket. They launched the new rocket once.

They have now retired, the Delta Four Heavy,

is Delta Four entirely, the whole family.

But this is the last launch, they put up a national reconnaissance of surveillance satellite

which is what mostly it was used for but it did many other things over the

history it was a very successful rocket. Delta

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