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VLBI: very-long-baseline interferometry
Interferometry is science's highest-precision distance-measuring technique. Most methods for measuring very small distances or movements involve some form of interferometry. Among its most spectacular accomplishments are establishing that the speed of light is constant for all observers, even if they are moving relative to the source of the light; detecting gravity waves; and imaging black holes.
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Putting the Black-Hole Data Together
A recent NY Times article raises the possibility of using black holes as gravitational lenses for see even deeper into the past. Click HERE. (If you get tired of trying to get through the Times's efforts to get you to subscribe, just ask me to send you the article. Shhh.)
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Basic Mathematics of Interferometry
(for math geeks)
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