global positioning systems – Signal Press

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Move over, GPS: Navigation satellites in low-Earth orbit are making a comeback

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Xona aims to deploy 258 satellites into low-Earth orbit as a GPS alternative.

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Once again, NASA is asking for ideas to rescue Hubble from certain death

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The FDA wants to pull its approval of a drug. It’s not so easy.

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Seabirds racing home over the ocean can get jet-lagged