Upper left: Transportable 2.4 m antenna installed at the INAF radio observatory in Medicina, Italy.
Upper middle: Transportable 2.4 m antenna installed at NICT in Koganei, Japan.
Upper right: 34 m antenna located at NICT in Kashima, Japan.
Bottom left: The ytterbium optical lattice clock IT-Yb1, operated at INRIM in Torino, Italy.
Bottom right: The strontium optical lattice clock NICT-Sr1, located at NICT in Koganei, Japan.
Transportable radio telescopes could provide global high-precision comparisons of the best atomic clocks. Using radio telescopes observing distant stars, scientists have connected optical atomic clocks on different continents...
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