Editing Faster-than-light (section)

===Astronomical observations===
Apparent [[superluminal motion]] is observed in many [[active galaxy|radio galaxies]], [[blazar]]s, [[quasar]]s, and recently also in [[microquasar]]s. The effect was predicted before it was observed by [[Martin Rees]]{{clarify|Was it predicted by Rees or observed by Rees?|date=March 2012}} and can be explained as an [[optical illusion]] caused by the object partly moving in the direction of the observer,<ref>
{{cite journal
|last1=Rees |first1=M. J.
|year=1966
|title=Appearance of relativistically expanding radio sources
|journal=[[Nature (journal)|Nature]]
|volume=211 |issue=5048 |pages=468–470
|bibcode=1966Natur.211..468R
|doi=10.1038/211468a0
|s2cid=41065207
}}</ref> when the speed calculations assume it does not. The phenomenon does not contradict the theory of [[special relativity]]. Corrected calculations show these objects have velocities close to the speed of light (relative to our reference frame). They are the first examples of large amounts of mass moving at close to the speed of light.<ref>
{{cite journal
|last1=Blandford |first1=R. D. |author-link=Roger Blandford
|last2=McKee |first2=C. F.
|last3=Rees |first3=M. J.
|year=1977
|title=Super-luminal expansion in extragalactic radio sources
|journal=[[Nature (journal)|Nature]]
|volume=267 |pages=211–216 |issue=5608
|bibcode=1977Natur.267..211B
|doi=10.1038/267211a0
|s2cid=4260167 }}</ref> Earth-bound laboratories have only been able to accelerate small numbers of elementary particles to such speeds.