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Behind the headlines: Why things look like they're moving faster than light

15 days ago   |   By Ars Technica

Enlarge / Alpha Centauri, which features prominently in our explanation. (credit: ESO/Digitized Sky Survey 2 Acknowledgement: Davide De Martin )
Earlier this week , we covered astronomers' discovery of fast-moving jets of particles, produced by the object that resulted from a collision of neutron stars. The jets were imaged at two different time points, roughly half a year apart. During that time, the jets appeared to be moving faster than light itself when viewed from Earth.
In the article itself, I mentioned the "viewed from Earth" part to indicate that this apparent speed was a matter...
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