Is the $10 billion James Webb Space Telescope worth the price tag?
The instruments have to be cooled to keep noise levels low. Sunlight is reflected off its sunshield and heat is carried away through radiators, the Mid-Infrared Instrument also has its own cryocooler that recycles helium. Scientists say that although JWST was loaded up with enough propellant to last at least 10.5 years, it could be stretched to 20 years, giving them more observation time.
Fortunately, the imaging powers of the telescope weren't impacted too much after mission control made two small adjustments to the mirror alignment. Scientists estimate that the JWST will be pelted by micrometeoroids about once a month, meaning its mirrors will degrade over time. The actual rate of deterioration, however, is unknown.
The JWST team said it was looking at ways to mitigate impact risks and will continue to model how the space prangs might affect its beryllium mirrors. Official science observations have begun, and astronomers will have a long while yet to keep studying the universe at depths they have never been able to before.
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