A small asteroid passed extremely close to the Earth on January 9, missing us by only 192,500 kilometers (119,500 miles), roughly half the distance between the Earth and the Moon. Because of its small size, the asteroid, called 2017 AG13, wasn’t spotted until two days before its approach.
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Despite the insistence of some physicists that quantum effects only affect things on an extremely small scale, new theories continue to be put forward that the smallest known processes may be responsible for some very, very big phenomena, ranging from things such as the navigational sense of migratory birds, to the potential that they may also be responsible for the very existence of life as we know it on Earth.
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There are serious concerns over the fate of NASA’s Earth science programs, in light of planned policies being released by president-elect Donald Trump. The Trump campaign’s space policy advisor, Robert Smith Walker, has stated that they plan to “redirect NASA budgets towards deep space achievements rather than Earth-centric climate change spending.”
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The levels of carbon dioxide found in the atmosphere in modern times have been found to be nearly ten times higher than any other time since the extinction of the dinosaurs, 65 million years ago. The event that came the closest to today’s CO2 levels, the Paleocene-Eocene Thermal Maximum (PETM), occurred 55.5 million years ago, where a spike in greenhouse gasses caused global temperatures to increase by 5–8 °C over what we’re experiencing today. While the existence and cause of the PETM is well established, the source of the massive amount of CO2 that caused the temperature spike has been a complete mystery to scientists.read more