PBS纪录片《我们的DNA秘密Secrets in Our DNA 2021》 Some 30 million people have sent their DNA to be analyzed by companies like 23andMe and AncestryDNA, hoping to obtain clues to family origins and forecasts of their future health. Some users have found family members and discovered lurking gene...
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Really weird ones In regards to microbes, spacecraft clean rooms are designed to be harsh, dry, low-nutrition environments. But there are some lifeforms out there that can withstand these extremes. "There'ssome really weird[microbes], and they have capabilities that you wouldn't expect," sai...
the brightest and rarest class of supernovae, first discovered ten years ago, thought to be caused by material falling onto the densest object in the Universe – a rapidly rotating neutron star newly formed in the explosion of a massive
Found and taken from the north Atlantic 6 days after the sinking of the Titanic in 1912 his tiny body so moved the rescue workers that they called him “our baby.” In their home port of Halifax Nova Scotia people collected money for a headstone in front of the baby's grave carved ...
Keller, who manages the Electron Beam Analysis Labs at the NASA Johnson Space Center, discovered grains thought to have originated in red giant stars—stars that are older than the sun. Also found were traces of supernova ejecta, the chemicals blasted outward in...
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meaning they will have a very short lifetime. Their presence suggests an average cluster age of nearly four million years. At the moment these stars are on the verge of exploding as supernovae. During their spectacular deaths they will release vast amounts of energy which, in turn, will he...