From the following URL:
https://www.universetoday.com/155169/nasas-upcoming-spherex-mission-will-map-the-entire-universe-in-infrared-every-6-months/
We read:
"NASA's Upcoming SPHEREx Mission Will map the Entire Universe in Infrared Every 6 Months"
If I understand the article, the plan is to compare successive sky surveys which I imagine means using image subtraction techniques. When they find differences, high resolution observational attention will then be devoted to those differences using the Webb telescope.
We also read:
".... the Hubble Space Telescope has given us amazing views of the heavens, but in its 30-year mission, it has only captured about 0.1% of the total sky."
That means that only 0.1% of the sky, only one one-thousandth of the sky, has been imaged by Hubble in its thirty years of service. By extrapolation, at that same rate of observations, imaging the entire sky would take Hubble thirty-thousand years or thirty millennia.
That's a sobering thought, isn't it.
Actually, the "Enitre" adjective is a bit overstated. The survery will capture 99% of the sky, but hey, who's counting?
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