The sighting of a blazing fireball over Australia is believed to be space junk, according to an expert. The fireball was caused by the re-entry of a navigation satellite called GLONASS-K2, launched by the Russian space agency. The incredible brightness of the fireball is due to its high speed of over 25,000 kilometers per hour.
. This was launched by Roscosmos on August 7 from the Plesetsk Cosmodrome about 800km north of Moscow.
When you rub your hands together, they get warm from the friction between them. Do that a thousand times faster and you can start to imagine them glowing white hot from the heat. If the friction is between the metal of the space junk and Earth's thin atmosphere at an altitude of 100km, we can get a very bright glow.
Some hardier engine blocks can make it to the ground, however, which is why alerts about space junk re-entering the atmosphere are sent out to aircraft in particular. To improve this system, we need better tracking stations on the ground and advances in the modelling of the interaction between space junk and the upper atmosphere to improve our forecasts.
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