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Arecibo Observatory will be demolished

      Arecibo’s days are done. After two support cables failed in recent months, the radio observatory’s 305-meter-wide dish is damaged beyond repair, the National Science Foundation announced on November 19. It will be decommissioned and dismantled.

     The telescope, famous for appearances in movies like GoldenEye and Contact, consists of a wide dish to collect radio waves from space and focus them into detectors housed in a dome suspended above the dish.

     In August, one of the cables that holds up the dome slipped out of a socket and punched a hole in the dish. Then a second cable unexpectedly broke on November 6. If a third cable were to break, it could send the platform holding up the dome swinging, or the whole structure could collapse. 

     The NSF determined that there was no safe way to repair the telescope. 

Adaptado de https://www.sciencenews.org/article/arecibo-telescope-observatory-icon-puerto-rico-science-demolished. 

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A rare plant has reappeared after more than a century in hiding.

The pinkish-flowered plant, known as grass-poly, was found growing on the banks of an old farmland pond in Norfolk.

The mystery species "came back from the dead" after seeds submerged in the mud were disturbed during work to restore the pond.

The seeds of the plant remained buried in the mud, like a "time capsule". When willows were pulled out to restore the pond, this disturbed the soil and let in light, allowing the seeds to germinate.

 "There's no oxygen, it's very dark, and it's perfect for preserving seeds," says Prof Sayer, who is part of UCL's Pond Restoration Research Group. The discovery shows plants believed extinct can be brought "back to life" with good conservation, he added.

Fonte: adaptado de https://www.bbc.com/news/science-environment-55104153