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Fraser
2016-Dec-15, 07:41 PM
A new short film showcases the James Webb Telescope - the successor to Hubble - and all the amazing things it is expected to accomplish.
The post James Webb Space Telescope Celebrated in Stunning New Video (http://www.universetoday.com/132418/james-webb-space-telescope-celebrated-stunning-new-video/) appeared first on Universe Today (http://www.universetoday.com).


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Amber Robot
2016-Dec-15, 10:47 PM
Why is JWST called a "successor" to HST? There are many capabilities of HST that are not being succeeded. JWST is a different kind of telescope that comes after HST. Since the word "successor" is not used with regard to other space telescopes that have launched after HST, it is implied that JWST is some kind of replacement/upgrade to HST. This tells an incomplete/misleading story and undercuts the value of HST and all that it has accomplished, and may yet still accomplish.

01101001
2016-Dec-15, 11:18 PM
NASA says JWST is a successor, not a replacement:

How does the Webb Contrast with Hubble? (http://jwst.nasa.gov/comparison.html)


Webb often gets called the replacement for Hubble, but we prefer to call it a successor. After all, Webb is the scientific successor to Hubble; its science goals were motivated by results from Hubble. Hubble's science pushed us to look to longer wavelengths to "go beyond" what Hubble has already done. In particular, more distant objects are more highly redshifted, and their light is pushed from the UV and optical into the near-infrared. Thus observations of these distant objects (like the first galaxies formed in the Universe, for example) requires an infrared telescope.
This is the other reason that Webb is not a replacement for Hubble is that its capabilities are not identical. Webb will primarily look at the Universe in the infrared, while Hubble studies it primarily at optical and ultraviolet wavelengths (though it has some infrared capability). Webb also has a much bigger mirror than Hubble. This larger light collecting area means that Webb can peer farther back into time than Hubble is capable of doing. Hubble is in a very close orbit around the earth, while Webb will be 1.5 million kilometers (km) away at the second Lagrange (L2) point.

bknight
2016-Dec-16, 05:53 PM
NASA says JWST is a successor, not a replacement:

How does the Webb Contrast with Hubble? (http://jwst.nasa.gov/comparison.html)
Both should be in operation at the same time until HST dies, or JWST , god forbid.

01101001
2016-Dec-16, 07:06 PM
Yes, the plan is for overlap.