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" ... An illustration of the 14 pairs of binary pulsars used to measure our galactic acceleration. In a ... [+] new study just published here in early 2021, the orbital periods and changes in the orbital periods of these pulsars were used to directly measure our galactic acceleration, the first time such a measurement was directly made. ... "
" ... Even so, when pulsars were first detected in the late 1960s, their radio signals were so clock-like and precise that astronomers initially thought they were wholly artificial. The first couple of signal detections were even dubbed LGM (Little Green Men) 1 and 2. ... "