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The first light was achieved in February 2003. HARPS has discovered over 130 exoplanets to date, with the first one in 2004, making it the most successful planet finder behind the Kepler space telescope. It is a second-generation radial-velocity spectrograph, based on experience with the ELODIE and CORALIE instruments. [1]
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In general relativity no coordinate system on a large region of curved spacetime is "inertial", so it is permissible to use a global coordinate system where objects travel faster than c, but in the local neighborhood of any point in curved spacetime we can define a "local inertial frame" and the local speed of light will be c in this frame, [42 ...
In May 2017, glints of light from Earth, seen as twinkling from an orbiting satellite a million kilometres away, were found to be reflected light from ice crystals in the atmosphere. [ 66 ] [ 67 ] The technology used to determine this may be useful in studying the atmospheres of distant worlds, including those of exoplanets.
Even light itself does not have a "velocity" of c in this sense; the total velocity of any object can be expressed as the sum = + where is the recession velocity due to the expansion of the universe (the velocity given by Hubble's law) and is the "peculiar velocity" measured by local observers (with = ˙ () and = ˙ (), the dots indicating a ...
Velocities for local objects are sometimes reported with respect to the local standard of rest (LSR)—the average local motion of material in the galaxy—instead of the Sun's rest frame. Translating between the LSR and heliocentric rest frames requires the calculation of the Sun's peculiar velocity in the LSR. [1]
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