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Only $4 billion to get to Uranus? Seems cheap.

Interestingly that's pretty similar to the cost of the Voyager program (taking the cost from [1] and adjusting for inflation).

Voyager 1/2 were some of the coolest things human beings have ever done in the entire history of humans as a concern.

We should do more stuff like that.

Yes, unmanned space projects are relatively cheap.

I think it was meant to be a joke

It was not.