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There is of course a great deal we don't know, and much of what we think we know we haven't known, or thought we've known, for long.
Even the notion of the Big Bang is quite a recent one. The idea had been
kicking around since the 1920s, when Georges Lemaître, a Belgian
priest-scholar, first tentatively proposed it, but it didn't really become an active notion in cosmology until the mid-1960s when two young radio astronomers made an extraordinary and
Their names were Arno Penzias and Robert Wilson.
In 1965, they were trying to make use of a large communications
antenna owned by Bell Laboratories(英式读法~) at Holmdel, New Jersey, but they were troubled by a
persistent background noise—a steady, steamy hiss that made any experimental work impossible. The noise was
unrelenting and unfocused. It came from every point in the sky, day and night, through every season.
For a year the young astronomers did everything they could think of to
track down and eliminate the noise. They tested every electrical system.
instruments, checked circuits, wiggled wires, dusted plugs. They climbed into the dish and placed
duct tape over every seam and rivet. They climbed back into the dish with brooms and
scrubbing(擦洗) brushes and carefully swept it clean of what they referred to in a later paper as "white
dielectric material," or what is known more commonly as bird shit. Nothing they tried worked.