NASA Tries To Save Hubble's Successor

Last month we discussed news that the James Webb Space Telescope, the planned successor to the HST, is on the budgetary chopping block. Now, an anonymous reader points out hopeful news from TPM's Idea Lab blog, which says NASA is trying to "spread the cost across the agency rather than just pulling from the $1 billion astrophysics division, with at least half of the funds coming from other areas of NASA's total $18 billion budget." According to Nature News, the decision resides with the White House's Office of Management and Budget, and support for the project depends in particular on Senator Barbara Mikulski (D-MD).

Comments

You better get NASA on the horn

[apparently]

Repeat after me..... JWSB != Hubble successor

I hate to "steam" you even more, but NASA disagrees with your "JWSC !- Hubble successor" belief.

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.

...which is the first paragraph on their page addressing whether or not Webb is Hubble's successor. I don't mean to imply that they're an authoritative voice or anything on the subject, but surely their opinion should be weighed into your semantics argument?

Re:Repeat after me..... JWSB != Hubble successor

[PyroMosh]

You are right, JWST is not Hubble. But there seems to be no reason at all to replace Hubble with an identical instrument. In that regard, as a spaceborne science telescope that can help capture the public's imagination of sights across the universe, the JWST *is* the Hubble successor, and it's useful to keep calling that.

Hubble's mission became largely irrelevant half way through it's lifetime. The purpose was to achieve detail which was impossible for ground based instruments that were trapped below miles of distorting atmosphere.

After Hubble was launched, researchers perfected techniques to work around atmospheric distortions. They fire a laser up and observe how the atmosphere distorts the beam. Using this data, a computer reverses the distortion of the atmosphere that the telescope is observing. Clever and effective. There are now dozens of earth based stations that are better instruments than Hubble.

So JWST is designed to do what ground based stations can never do: observe parts of the spectrum that never reach the ground. No amount of computer trickery or laser distortion detection will make infrared light reach the surface. The atmosphere blocks most of it. So in that respect: A space based telescope designed to do what ground based stations CAN'T, it *is* a successor.

This also ignores the fact that Hubble is enormously popular. There is power in this. Why would NASA not leverage that popularity and say "Remember that great program we started in the early 90s with the space telescope? Congress wants to axe funding for the next one that will be EVEN BETTER!"