![May 12, 2022, Milky Way Galaxy: Radio astronomers have imaged the super massive black hole at the centre of the Milky Way. It is only the second-ever direct image of a black May 12, 2022, Milky Way Galaxy: Radio astronomers have imaged the super massive black hole at the centre of the Milky Way. It is only the second-ever direct image of a black](https://c8.alamy.com/comp/2J83NA3/may-12-2022-milky-way-galaxy-radio-astronomers-have-imaged-the-super-massive-black-hole-at-the-centre-of-the-milky-way-it-is-only-the-second-ever-direct-image-of-a-black-hole-after-the-same-team-unveiled-a-historic-picture-of-a-more-distant-black-hole-in-2019-the-long-awaited-results-presented-today-by-the-event-horizon-telescope-eht-collaboration-show-an-image-reminiscent-of-the-earlier-one-with-a-ring-of-radiation-surrounding-a-darker-disk-of-precisely-the-size-that-was-predicted-from-indirect-observations-and-from-albert-einsteins-theory-of-gravity-credit-image-event-horizo-2J83NA3.jpg)
May 12, 2022, Milky Way Galaxy: Radio astronomers have imaged the super massive black hole at the centre of the Milky Way. It is only the second-ever direct image of a black
![HF radio becomes low-cost alternative to satellite | High-frequency radio - Urgent Communications article HF radio becomes low-cost alternative to satellite | High-frequency radio - Urgent Communications article](https://urgentcomm.com/files/2011/03/hf-radio-propagation-201103-4.jpg)
HF radio becomes low-cost alternative to satellite | High-frequency radio - Urgent Communications article
![Radio waves from a star, of wavelength 150 m, reach a radio telescope by two separate paths, as shown in the figure below (not drawn to scale). One is a direct path Radio waves from a star, of wavelength 150 m, reach a radio telescope by two separate paths, as shown in the figure below (not drawn to scale). One is a direct path](https://homework.study.com/cimages/multimages/16/radiotelescope2216504940464074567.jpg)