As the spacecraft descended, it sent back signals when critical events occurred: heat shield separation, parachute deployment, retro-rocket firing.
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Greenery is critical to counterbalance the "urban heat island" effect from hotter, drier summers, when night-time temperatures remain high because of heat retained by brick and tarmac.
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Not having to use high heat to remove the oxygen was critical, Brown said.
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To maintain the critical temperature, Dr Zheludev uses a small electronic heat pump known as a Peltier cell.
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