I'm no expert in astrophysics so forgive me if this is a trivial question, but I read in (the abstract of) a recent paper in the Journal of Astrophysics and Astronomy that "... It appears that HST-1 moves with an apparent speed of 1.23c±0.91c ..."(adsbygoogle = window.adsbygoogle || []).push({});

Now I want to clarify what this means. I take it c is the speed of light? I have no problem with 1.23c-0.91c but when one says 1.23c+0.91c would it not mean the thing is traveling faster than light?

The abstract is here: http://www.ias.ac.in/jaa/marjun2011/abstracts/04.htm

And the paper is here: http://www.ias.ac.in/jaa/marjun2011/04.pdf

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# HST-1 moving faster than light?

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