TWO DIF­FER­ENT TELE­SCOPES

Cosmos - - Cover Story -

Like a lens, a ra­dio te­le­scope’s dish re­lies on phys­i­cal cur­va­ture to fo­cus sig­nals and trace their source. To look at dif­fer­ent bits of the sky, it must phys­i­cally swing around – it takes thou­sands of hours to map the en­tire sky.

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