Let me tell you a story, a story about a fast radio burst (high-energy astrophysical phenomenon of unknown origin) leaving a Galaxy far far away, traveling to Earth over billions of years and occasionally passing through clouds of gas in its path. Each time a cloud of gas is encountered, the different wavelengths that make up a burst are slowed by different amounts. Timing the arrival of the different wavelengths at a radio telescope tells us how much material the burst has travelled through on its way to Earth and allows astronomers to detect "missing" matter located in the space between galaxies. Using CSIRO's Australia Square Kilometre Array Pathfinder (ASKAP), astronomers have proved that fast radio bursts are coming from the other side of the Universe rather than from our own galactic neighbourhood. Space is awesome.
💻: CSIRO/ICRAR/OzGrav/Swinburne University of Technology
If the Moon was at the same distance as the @ISS 🛰, just 420 kilometers (260 miles) away from us. 😨
Normally the Moon orbits much slower than the earth rotates so it rises in the east and sets in the west, however at 420km it orbits much faster, faster than the earth rotates underneath (1 full rotation: 90 mins), therefore it will rise in the west and set in the east.
Via @slate@thebadastronomer "The Moon would fill more than half the sky. It would also appear to rotate, although it would actually still be tidally locked to our planet like it currently is. And some Earthlight would reflect onto the Moon, except for where the Moon blocks the Sun. It would cross the sky in very roughly five minutes!"
Of course, in reality, if the Moon was actually this close it would break apart due to gravitational forces and bye bye Humans.
This video was created by #Youtuber@YetiDynamics (Nick)
It was extremely difficult to detect gravitational waves, the disturbance caused by interacting masses in space 🌠
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[FUN FACT] When LIGO first detected waves given off by black hole merger, the ripple in spacetime changed the length of a 4-kilometer interferometer arm by 1/1000 the width of a proton. 🌌
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TAG 🙌@the.astronomy.daily or use #TheAstroDaily to feature your photo! 🌟
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Illustration credit: NASA, Markus Hanke 🖼