Hubble versus Webb

Bad Astronomy
The entire universe in blog form
June 15 2010 2:24 PM

Hubble versus Webb

Hubble is an awesome 'scope, but its life is limited. Heavy and huge, there's no way to bring it back, and with the Shuttle retiring there's no easy way to get to it. Eventually its gyros will fail, it won't be able to be pointed, and then that's that.

For the past few years, NASA has been working on the James Webb Space Telescope, what some people call Hubble's "replacement", which is a misnomer: it's actually Hubble's successor. It will do amazing astronomy too, but it has different capabilities than its predecessor.

Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

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How different, you ask? I'm glad you did, and so is NASA: they've put together a side-by-side comparison of the two observatories (warning huge Flash animation stuff).

Just how different are they? Check out the comparison of their mirrors:

hst_vs_jwst

Hmmm, the woman in the diagram is pretty tall, 1.8 meters -- 6 feet! Of course, she's in heels. But should she really have her hand on that priceless (if incorrectly ground) mirror?

Anyway, check out the comparison. I'll miss Hubble when it goes, but I'm very excited about what JWST will do for astronomy, for science, and for humanity's search for understanding. It will be a powerful, powerful tool.

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