20 Billion comes from Brig. Gen. Steve Anderson, who was Cheif Logistician to Gen. David Petraeus in Iraq - according to him it includes the costs involved of shipping the fuel to power the equipment, the cost of getting the equipment there, the cost of setting up the infrastructure, and so on and so forth.
EG:
Source
The appropriations bill terminated the funding for the James Webb Space Telescope, which they say is billions of dollars over budget and plagued by poor management.
Which unfortunately seems to be true.
And?
That's not a good reason to cancel the program.
If poor management is causing the problem, then improve the management.
If the Project is over budget, then investigate why.
Oh wait, that's right, it's already been done.
http://www.nasa.gov/pdf/499224main_JWST-ICRP_Report-FINAL.pdf
The project is over budget, because the originaly projected budget was unreasonably low.
The JWST was supposed to cost $1.6 billion and launch this year but in the latest technology review NASA says the telescope can’t launch until at least 2018 (outside analysts suggest that the launch date would be past 2020) and the latest estimated price is now up to $6.8 billion (and probably much more with a launch date 7 years off).
Still not a good reason to cancel the project - I mean seriously, the comments about extra money and poor management are coming from things like the practice of deferring work until next year once this years budget cap is reached - probably as a result of this whole smaller-better-faster paradigm they've been operating under - which was pushed on them to get more science for less money.
Canceling the project is just stupid, and it's a huge blow for science, and it doesn't actually address the problems causing the cost over runs in the first place.
I mean think of it this way how many of NASA's projects have far exceeded their original design specs? The MER's - designed to last 90 days. 3,000 days later, and one of them's still running (the other got caught on a rock, bogged down in some sand, and didn't survive winter).
Look at the EPOXI mission - Deep Impact was over and done with, so they retasked the space craft, revisited the same comet a second time (first time that the same spacecraft has visited the same comet twice) and visited a second comet (another first).
But
no. War is
easier than science.