We recently compared NASA’s $8 billion James Webb Space Telescope to the European Extremely Large Telescope, which will provide 6 times the resolution at 1/6 the price.

Soon afterward, we received a note from former NASA scientist-astronaut Ed Gibson, who operated the Apollo Telescope Mount during the Skylab 4 mission. Dr. Gibson thought we had understated the case: “The E-ELT has a second advantage over the JWST’s lower resolution and light collection area; it can be serviced as required; the JWST, unlike the HST, cannot be serviced insitu.”

To be fair, NASA is studying some ideas for in-space servicing of JWST, using the Orion capsule and Space Launch System. Impartial observers do not consider those ideas to be credible, however. An Orion mission to the Earth-Sun L-2 point, where JWST is to be located, would cost a minimum of $2 billion, for the launch alone. That assumes Orion and SLS are already developed and available when they are needed.

Read more: Astronomy and In-Space Servicing — Citizens in Space.

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