<https://techiazi.com/astronomers-detect-hot-gas-bubble-swirling-around-the-milky-ways-supermassive-black-hole/#person-Sunilyadav>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://techiazi.com/astronomers-detect-hot-gas-bubble-swirling-around-the-milky-ways-supermassive-black-hole/>