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A giant arc of galaxies appears to stretch across more than 3 billion light-years in the distant universe. If the arc turns out to be real, it would challenge a bedrock assumption of cosmology: that on large scales, matter in the universe is evenly distributed no matter where you look. Lopez and colleague discovered the purported structure, which they call simply the Giant Arc, by studying the light of about 40,000 quasars captured by the Sloan Digital Sky Survey. Quasars are the luminous cores of giant galaxies so distant that they appear as points of light. While en route to Earth, some of that light gets absorbed by atoms in and around foreground galaxies, leaving specific signatures in the light that eventually reaches astronomers’ telescopes.
The Giant Arc’s signature is in magnesium atoms that have lost one electron, in the halos of galaxies about 9.2 billion light-years away. The quasar light absorbed by those atoms traces out a nearly symmetrical curve of dozens of galaxies spanning about one-fifteenth the radius of the observable universe, Lopez reported. The structure itself is invisible on the sky to human eyes, but if you could see it, the arc would span about 20 times the width of the full moon. Our eye has a tendency to pick up patterns,” Sarkar says, noting that some people have claimed to see cosmologist Stephen Hawking’s initials written in fluctuations in the cosmic microwave background, the oldest light in the universe.
Lopez ran three statistical tests to figure out the odds that galaxies would line up in a giant arc by chance. All three suggest that the structure is real, with one test surpassing physicists’ gold standard that the odds of it being a statistical fluke are less than 0.00003 percent.
That sounds pretty good, but it’s not enough, Sarkar says.
💡 Did you know? 💡
That SPACE is completely silent. 💫 🤫
The Apollo astronauts' footprints on the moon will probably stay there for at least 100 million years. 🌙
One DAY on Venus is longer than one YEAR on Earth 🌍
Regardless, it is still tempting to look at the number of satellites orbiting Jupiter and consider it and its moons as, in many ways, a mini solar system! . Credits: @spaceytales . . Follow @atomstalk . . . #jupiterplanet #jupiter #jupitermoon #spacefacts #spacefact #starstuff #stars #solarsystem #astronomyscience #astronomy #sciencefact #sciencefacts https://www.instagram.com/p/CIUr_iMDhuF/?igshid=dyjz5m6dhbk7
The return of the LIDAR ❄️ . In a peninsula far, far away, a laser shoots into the sky to study the Antarctic atmosphere at Concordia research station. .⠀ The Light Detection and Ranging instrument, or LIDAR, is a remote sensing technique that uses light to study an object. ⠀⠀⠀⠀⠀ A pulsed laser beam is aimed at the target and properties of the resulting scattered light are recorded by sensors. Using these measurements, researchers collect information about the atmosphere, including density, temperature, wind speed, cloud formation and aerosol particles. ⠀⠀⠀⠀⠀ LIDAR and SONAR (sonic detection and ranging) instruments help monitor the Atmospheric Boundary Layer, the 1 km thick bottom layer of the troposphere where changes on Earth’s surface strongly influence temperature, moisture and wind. ⠀⠀⠀⠀⠀ These changes to Earth’s surface are largely caused by human activity. Increased greenhouse gas emissions are raising temperatures and the release of chlorofluorocarbons is thinning the ozone layer, particularly in the Polar Regions. ⠀⠀⠀⠀⠀ The station operates two LIDAR instruments. The one imaged is the smaller of the two, located 500 m south of the station. A laser beam is emitted daily for one minute every five minutes during the winter period. ⠀⠀⠀⠀⠀ Atmospheric physics and chemistry is one field of research undertaken at Concordia to assess the Antarctic climate and overall climate change. ⠀⠀⠀⠀⠀ Go to blogs.esa.int/concordia to learn more. ⠀⠀⠀⠀⠀ 📸 @europeanspaceagency / IPEV / PNRA – S. Thoolen . . Follow @atomstalk . . . #spaceknowledge #spacefacts #spacefact #scienceforthepeople #atmospheric #lidar #sonar #scienceisawesome #scienceresearch #researcher #researchers https://www.instagram.com/p/CECMA7YDcoq/?igshid=14ed8low3diqv
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That's Too Dense 😯. Did you know that? . . Follow @atomstalk . . . . #neutronstar #space #spacefacts #spacefact #astronomyfacts #sciencefacts #sciencefact #astronomynerd #astronomy #amateurastronomy #spacestar #blackholes https://www.instagram.com/p/CBj_0S7DHcs/?igshid=bfqrxj8d9he4
How big is a light year! . . . #spacefacts #spacetravel #spacex #spacefact #spacetraveler #space #astronomer #astronomyscience #astronomy #astronomyimages #astrophysics #astrofact #astromania #astronaut #spacescience https://www.instagram.com/p/CAiM-dyBVC9/?igshid=ebpfwsoosukg
Earth 750 million years ago . . . . #astrofact #astrofacts #spacefacts #spacefact #universefacts #dailyfactsbox #earthfacts #sciencefact #dailydose #scienceofspace #universeknowledge #facts💯 #doyouknowfacts #howtheuniverseworks #spaceknowledge #unknownfacts #coolfacts #coolfactz #amazingfacts #sunfacts #moonfacts #worldfacts #crazyfacts #dailydoseofinternet #nasafacts #cosmosfact #astrophile #physicsfacts #funfactsoftheday #funfacts https://www.instagram.com/p/CAh9y7oByhy/?igshid=q8bn6m2su7j3
