For several years now, astronomers have been searching for a hypothetical Planet 9 in the starry sky. You can use the constellation Orion to show you approximately where they’re looking. Source: https://earthsky.org/tonight/star-hop-from-orion-to-planet-9…
Tag: Planet 9
Is Our Solar System’s Mysterious ‘Planet 9’ Really a Grapefruit-Size Black Hole?
It probably isn’t a black hole, if it exists at all. But two physicists think we should check to see if it’s a black hole anyway. Source: https://www.livescience.com/tiny-ancient-black-hole-planet-nine.html