NASA Unveils Hubble's Successor 188
dalutong writes "BBC News has an article detailing NASA's replacement for the much-loved Hubble telescope. The $4.5 billion telescope will be placed in orbit 1.5 million km from Earth and will be almost three times the size of the Hubble. It is set to launch in 2013. They also plan to service the Hubble in 2008."
Re:So if this one breaks ... (Score:5, Informative)
Re:Keeping Hubble (Score:5, Informative)
We dont need hubble for visible... (Score:2, Informative)
Dont forget that "hugely expensive" for a ground telescope is compareable to "dirt-cheap" for a space-based one.
All 4 of the VLT telescopes were (IIRC) cheaper than a single hubble service mission. And OWL should be compareable to a modern space-telescope, too, for a fraction of the price (dont forget: its a tradeoff: better seeing vs "have to design a mirrror that can withstand the acceleraion and fits the launch vehicle).
Also, i think the huge bias on that single octave of electromagnetic radiation is out of proportion.
There arent even that many useful lines in it
Oldest pictures of the universe (Score:2, Informative)
To quote the article...and wikipedia...and NASA... (Score:5, Informative)
To add more evidence. Look, wikipedia!
http://en.wikipedia.org/wiki/James_Edwin_Webb [wikipedia.org]
To 1-up wikipedia. Look, NASA!
http://www.jwst.nasa.gov/whois.html [nasa.gov]
The man whose name NASA has chosen to bestow upon the successor to the Hubble Space Telescope is most commonly linked to the Apollo moon program, not to science. Yet, many believe that James E. Webb, who ran the fledgling space agency from February 1961 to October 1968, did more for science than perhaps any other government official and that it is only fitting that the Next Generation Space Telescope would be named after him.
Re:We dont need hubble for visible... (Score:5, Informative)
Your cost estimates are accurate, but the rest of your argument is total shit. Adaptive optics, WHEN it works (which is rarely, and with difficulty), can approach the angular resolution of HST in a VERY SMALL field of view. You cannot get 0.05 arcsec, diffraction limited images over a wide field of view, that is possible with HST.
"Designing a mirror to withstand a launch vehicle" is a problem that has been solved. And the only two current, viable telescope proposals for telescopes larger than 10m are the Thirty Metre Telescope (TMT [tmt.org]) and the Giant Magellan Telescope (GMT [gmto.org]). OWL is not a concept that is being taken very seriously...ESO certainly hasn't put its money where its mouth is.
Your final point, about not many lines in that part of the spectrum, belies a complete lack of understanding of what you are talking about. The UV (accessible with STIS, and the Cosmic Origins Spectrograph, which will fly on SM4 in late '08) are so full of lines that they overlap all over the place. See, for example, Morton (2003), ApJS, 149, 205, for a comprehensive list. At low redshift, lines of HI, OI, OVI, CIV, NV, CII, SiII, SII, FeII, NI...all are in the UV, in the STIS band. Furthermore, space is the ONLY place these wavelengths can be observed, because of the atmosphere is opaque to wavelengths shorter than about 3300 angstroms.
Re:Keeping Hubble (Score:5, Informative)
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Rent solar power: http://mdsolar.blogspot.com/2007/01/slashdot-user
Re:color me not impressed (Score:5, Informative)
Re:Oldest pictures of the universe (Score:5, Informative)
That's no moon... (Score:1, Informative)
The captcha is spectrum...how fitting.
Re:So if this one breaks ... (Score:5, Informative)
Re:sunshield? (Score:5, Informative)
Earth only has 12000km diameter. Sun has 1.4 million km diameter.
For earth to give shade, it would have to be closer than AU*(r_earth/r_sun), which is much closer than the lagrange point.
Simply put: you would get a dark spot on the sun, but no complete cover.
Re:sunshield? (Score:2, Informative)
Thus, the need for the sunshade.
The point of sending something to L2 is that it is still permanently close enough to Earth to make high bandwidth communications easy, while it is far enough from Earth to have an unobstructed view of nearly the entire sky. Additionally, L2 requires comparably mild propulsive resources to reach and to maintain position near.
Re:I thought space telescopes were obsolete... (Score:5, Informative)
Re:I thought space telescopes were obsolete... (Score:1, Informative)
Re:I thought space telescopes were obsolete... (Score:1, Informative)