the light signal from the event-effect "2" is detected earlier than the light signal from the event-cause "1" due to the fact that the signal from the event-cause "1" moves (along the IRF motion direction) for a time longer than the total time of the superluminal motion
and the reverse (i.
In Chapter 5, Hudson takes up a puzzle about the apparent inconsistency between certain views in mereology and the a posteriori denial of superluminal motion
Astronomers had previously observed superluminal motion
of material expelled by GRS 1915+105, notably during a giant outburst 3 years ago (SN: 9/3/94, p.
This superluminal motion
is now known to be an optical illusion caused when matter moves at near-light speeds almost directly toward Earth.
Last June, at a meeting of the American Astronomical Society in Minneapolis, he and his colleagues reported their recent observations of superluminal motion
in a jet of gas at the center of the galaxy M87.
The discovery constitutes the first observation of superluminal motion
at visual wavelengths.
The appearance of superluminal motion
is held to be an optical illusion, but the illusion imposes serious difficulties on attempts at an explanation.
Past cases of superluminal motion
have involved high-redshift galaxies and quasars, but M87 is the second-closest galaxy with a radio-bright jet.
FELIX MIRABEL and LUIS FELIPE RODRIGUEZ received the American Astronomical Society's Bruno Rossi Prize in 1996 for discovering microquasars and superluminal motions
within our galaxy.
All those considerations concerning the principal possibility of superluminal motions
have led Tangherlini, in the future, to his own version of the transformations of the spatial coordinates and time being moved from one inertial reference frame into another one, which is different from the Lorentz transformations.
On superluminal motions
in photon and particle tunnellings.
Also, some blobs must be ejected at bulk velocities greater than 99 percent of the speed of light in some objects -- those exhibiting so-called apparent superluminal motions