Rare rocks known as carbonaceous chondrites really are old as time—and that's what makes them priceless.
The Winchcombe rock saved space agencies the trouble by coming to Earth instead. More than that, because locals caught the meteorite’s course with their doorbell cameras and dashcams, astronomers had no trouble reconstructing the rock’s arc through the atmosphere.
“Since we know the pre-atmospheric orbit of the original rock and the meteorite was recovered only hours after landing, it’s been a little bit like having our own ‘natural’ sample return mission from an asteroid,” says King. Because the fragments came from a known environment, astronomers could also confidently determine which bits came from the meteorite and which came from, say, a driveway. The pieces were also retrieved within days, which meant any contamination was kept to a minimum. “The Winchcombe [rock] is pristine, unmodified by the terrestrial environment, and gives us a chance to look back through time,” says King.
“We were able to make a really exciting measurement of the composition of the water in Winchcombe and know it was 100 percent extraterrestrial,” saysThe scientists did just find water in their time capsule—they also detected carbon- and oxygen-containing compounds, including amino acids, the building blocks of life on Earth.Although Winchombe’s rock is a rarity on Earth, the early solar system would have been teeming with debris like this.
To answer that, a group of researchers from France and Denmark examined a very different sort of meteorite: fragments of Mars, broken off and cast away until they fell to Earth. There are
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