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    LIGO confirmed the existence of gravitational waves in 2015, detecting one-time perturbations of spacetime from the merger of large black holes. There should be a background of gravitational waves permeating space due to other cataclysmic events in the cosmos, perhaps dating from the Big Bang. The NANOGrav consortium reports evidence from pulsar timing arrays that space is filled with such waves. Simulations suggest the cosmic gravitational wave background is likely caused by the merger of hundreds of thousands of supermassive black holes over the history of the universe.

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    • Groups report evidence that the #cosmos is filled with a background of #gravitationalwaves likely due to mergers of supermassive black hole binaries @UCBerkeley #blackholes #pulsars #spacetime #gravitation https://t.co/XH682PBJQb

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    The five-planet spread — of Mercury, Jupiter, Venus, Uranus and Mars — can be seen from anywhere on Earth, as long as you have clear skies and a view of the west.

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    • Don’t miss it! Planets on parade: The five-planet spread — of Mercury, Jupiter, Venus, Uranus and Mars — can be seen from anywhere on Earth, as long as you have clear skies and a view of the west. https://t.co/Ha4WTPXJh7 @NASA @NASA_Astronauts #space #cosmos #planets

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    Never miss an eclipse, a meteor shower, a rocket launch or any other astronomical and space event that’s out of this world.

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    • Sync Your Calendar With the Solar System - don’t miss launches, eclipses or asteroid viewings. @NYTimes ⁦@NASA⁩ ⁦@SpaceX⁩ ⁦⁦@elonmusk⁩ #space #cosmos #lunar https://t.co/rAkDFPiLrd

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    The first scientific results are coming in, and the $10 billion instrument is working even better than astronomers had dared to hope.

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    • The Webb Telescope Is Just Getting Started: The first scientific results are coming in, and it is working better than astronomers had dared to hope. via @NYTimes ⁦@NASAWebb⁩ ⁦@NASA⁩ #space #cosmos https://t.co/OWS3nFfbkz