Meteorite falls are extremely rare events that may offer a glimpse of the processes that formed our own world. When a space rock does come to town, a team of amateur sky-watchers are not far behind
At 21.54 on 28 February 2021, 16 cameras belonging to amateur sky-watching network UKMON picked up a bright shape headed towards Earth. Pictures show a long white line, which was visible for eight minutes, a glowing globule of light against the dark sky. “For me it’s like fishing,” said Richard Kacerek, one of the founders of UKMON. “You cast your line and then you wait. There are days when you catch nothing but there are days when you catch a really, really big fish and it’s so exciting.” The fireball of February 2021 was such a fish: a lump of flaming extraterrestrial rock travelling at a speed of about 8.4 miles a second – 15 times the speed of a rifle bullet – and headed for the Cotswolds market town of Winchcombe.
Meteorites are rocks from space that have entered our atmosphere. Most were once part of asteroids – the rocky, airless remnants left over from the formation of our solar system 4.6bn years ago. Almost all of them are what collectors call “finds”, meaning that the stone has been discovered by searching the ground, having fallen earlier – in most cases several thousand years earlier. A “fall”, a meteorite that is seen in flight and then recovered, is very, very rare. Worldwide, typically only about 10 such rocks are picked up each year. Before 2021, the last reported UK fall was a rock the size of a cricket ball that landed in a hedge in Glatton in Cambridgeshire in May 1991.
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