

Can A Spider Build A Web Without Gravity? #Microgravity #Skylab #ISS #NASA #SpaceExperiment
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Can a spider build a web without gravity? Instead of guessing, scientists sent spiders to space. In space, gravity isnât zero. Astronauts and spiders float because a spacecraft is in continuous free fall around Earth, creating microgravity, and the usual âdownâ signal almost disappears. For a web-building spider, that signal matters. On Earth, gravity is its basic reference for up and down, and orb-weaving spiders in normal gravity consistently face downward on the webâs hub and build asymmetric webs. In 1973, NASA sent two cross spiders (Araneus diadematus), Arabella and Anita, to the Skylab space station on the Skylab 3 mission. The experiment was suggested by Judith Miles, a high school student who won a spot in NASAâs Skylab Student Experiment Competition. After initially moving erratically, Arabella built a recognizable web within about two days, though the silk was finer than on Earth and varied in thickness. In 2011, two juvenile golden orb-weaving spiders (Trichonephila clavipes) were brought to the International Space Station and observed for almost two months, alongside control spiders on Earth. A 2020 study published in The Science of Nature, led by Samuel Zschokke of the University of Basel, found that in microgravity the spidersâ orientation on the web was highly variable. But when light was available, they used the direction of light as an orientation guide, both while building and while waiting for prey. Zschokke said it was surprising that spiders have such a backup system, given that they have never been exposed to an environment without gravity during their evolution. The result shows that gravity doesnât only keep living things on the ground, it shapes their behaviour too. Source: Zschokke, S. et al. (2020), Spiders in space, orb-web-related behaviour in zero gravity, The Science of Nature. NASA, Skylab 3 Student Experiment ED52, Web Formation in Zero Gravity. Guinness World Records, First Spider Web in Space. #Microgravity #Skylab #ISS #NASA #SpaceExperiment
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