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nbsp;Mars has nights with temperatures as cold as minus 130 degrees Fahrenheit and the planet has a rarefied atmosphere that's just about 1% of the density of Earth's atmosphere -- though the planet's gravity could give the helicopter a boost. wstu CRUZ DEFENDS ROLE IN ELECTORAL VOTE OBJECTIONS He led a group of 11 senators demanding a 10-day delay to audit the election results and an emergency investigation, though no evidence of widespread fraud has emerged in the two months since the election. wstu Last year, they alleged that Senate Republicans were holding a sham trial because they refused to bring witnesses despite weeks of hearings and depositions in the House of Representatives that created a record on the Ukraine matter Trump was impeached over. wstu GET THE FOX NEWS APPResearchers said the greater toll may be tied to lower-paying jobs, job losses and health insurance troubles, but also high-risk exposure among essential workers, crowded housing and reliance on public transportation, among other factors. wstu