Are aliens hiding in plain sight?
In July, three unmanned missions blasted off to Mars – from China (Tianwen-1), the US (Nasa’s Mars 2020 Perseverance Rover) and the United Arab Emirates (Hope). The Chinese and American missions have lander craft that will seek signs of current or past life on Mars. Nasa is also planning to send its Europa Clipper probe to survey Jupiter’s moon Europa, and the robotic lander Dragonfly to Saturn’s moon Titan. Both moons are widely thought to be promising hunting grounds for life in our solar system – as are the underground oceans of Saturn’s icy moon Enceladus.
Meanwhile, we can now glimpse the chemical makeup of atmospheres of planets that orbit other stars (exoplanets), of which more than 4,000 are now known. Some hope these studies might disclose possible signatures of life.
But can any of these searches do their job properly unless we have a clear idea of what “life” is? Nasa’s unofficial working definition is “a self-sustaining chemical system capable of Darwinian evolution”. “Nasa needs a definition of life so it knows how to build detectors and what kinds of instruments to use on its missions,” says zoologist Arik Kershenbaum of the University of Cambridge. But not everyone thinks it is using the right one.
research centre in California sees a cautionary tale in AA Milne’s story from Winnie-the-Pooh, in which Pooh and Piglet hunt a Woozle without knowing what it looks like and mistake their own footprints for its tracks. “You can’t hunt for something if you have no idea what it is,” she says.
Source: The Guardian
You may be interested
Greek Resort named top “World’s Leading Luxury Green Resort”Panos - Dec 01, 2020
Sani Resort in Kassandra, Halkidiki gained the top spot as the “World’s Leading Luxury Green Resort” at the World Travel…
Greeks pay over half a million euros in Covid-19 fines in a dayPanos - Dec 01, 2020
Greeks were fined a total of over half a million Euros for violating Covid-19 measures following intensive police inspections on…
Hellenic Civil Aviation Authority extends Covid-19 directives until December 7 and 14Panos - Dec 01, 2020
The Hellenic Civil Aviation Authority (HCAA) extended the Covid-19 directives for domestic flights until Monday 7 December 2020 and for…