> the benefits of a second one would be marginal compared to the benefits of the first one.
This can't be true.
The benefit of the JWST is the observations it can make Two JWSTs can make twice as many observations as one, so it provides twice the benefit.
In some sense there is a diminishing return in that the most important observations will be attempted first, and and over time the average observation will be less and less important. But surely there is many decades of pent up very important research!
This can't be true.
The benefit of the JWST is the observations it can make Two JWSTs can make twice as many observations as one, so it provides twice the benefit.
In some sense there is a diminishing return in that the most important observations will be attempted first, and and over time the average observation will be less and less important. But surely there is many decades of pent up very important research!