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Play, download and edit the free video Understanding Gravity: ngVLA Science Case.

Infrared telescopes have observed stars orbiting our galaxy’s central black hole for decades. The next generation Very Large Array will reveal the faint signals of pulsars that also orbit the black hole. The motion of pulsars can be measured with a million times more accuracy than that of stars. These so-called “celestial clocks” will study the effect of gravity on motion and time. This will let us test Einstein’s theory of gravity in new ways. It may even provide clues to physics beyond the standard model.

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