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Please see Storyline for restrictions and usage terms. South Africa: Hailstorm, flooding hit Pietermaritzburg A freak thunderstorm hit parts of Pietermaritzburg on Wednesday, December 22, bringing large-sized hail and flooding.US: Travelers line up at airports as flight cancellations continue Long lines of passengers were seen at airports across the US as thousands more flights were delayed or canceled on Tuesday, December 28 due to bad weather and sick crews.

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Kessler proposed it would take 30 to 40 years for such a threshold to be reached and today, some experts think we are already at critical mass in Low Earth Orbit (LEO), says NASA. It is also known as collisional cascading. In the late 1970s he foretold the possibility of a scenario that has been dubbed the Kessler syndrome: Collisions creating more debris, thus resulting in a runaway chain reaction of collisions and more debris.

“Finding ways to remove at least some of all that space junk should be a top global priority,” says Donald Kessler, a retired NASA senior scientist for orbital debris research. The problem of managing space debris is both an international challenge and an opportunity to preserve the space environment for future space exploration missions, according to NASA. Space junk is no one countries’ responsibility, but the responsibility of every spacefaring country. “Such maneuvers with the space station require about 5 hours to plan and execute using the station’s Russian thrusters, or the propulsion systems on one of the docked spacecraft.” How can we clean up space junk?