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Thousands of tons of cosmic dust are estimated to reach the Earth's surface every year, with most grains having a mass between 10−16 kg (0.1 pg) and 10−4 kg (0.1 g). The density of the dust cloud through which the Earth is traveling is approximately 10−6 dust grains/m3.
The best spots to look for and find the extra-terrestrial dust particles are surfaces with little vegetation and erosion, where, once landed, they remain collectable for a long time: for example on ice surfaces in the Antarctic or on the seabed. Researchers from the Museum für Naturkunde Berlin and the Freie Universität Berlin now want to tap a new source of the scientifically very valuable material. They are counting on the active support of Berlin citizens.
Cosmic crumbs
“We want to collect micrometeorites, they are usually less than one millimetre in size, from Berlin roofs,” says project manager Lutz Hecht. The idea has already proven successful: The researchers extracted 63 micrometeorites from many kilogrammes of dust from a roof area of around 5000 square metres. They are now identifying further roofs, which could be good places to find more due to their location and nature.
At the selected locations, the material is swept together and the particles from 0.1 to 0.8 millimetres in size are sifted out. Magnetically reacting particles are then extracted from these. The yield is washed, light particles discarded and the remaining material is dried and examined under microscopes. “This is a very time-consuming task that requires the help of volunteers who help us picking out the interesting objects,” says Hecht.
Whether the interesting objects actually are micrometeorites will be checked with an electron microscope. The museum’ geochemical and microanalytical laboratories are equipped for analysis
istg tom’s probably in that suit
This is like imagination training session and it is so cool! To imagine how many prehistoric species we'll never even learn about existing because i.e. they were too soft to leave a fossil. To imagine how bizarre and monstrous we would see animals of today if we only judged by their skeletons as we do with dinosaurs. And to imagine triceratops' mating dance😉
Get ready to have your sides split with laughter as we present a compilation of the most unbelievable mishaps ever captured on camera! From
In this heartwarming video, a father and his daughter share a special moment, and the love and joy between them is palpable. This video is a
Aight mutuals this is very important. Can you help me find the one dinosaur video where they're all screaming the one old guy with the cowboy hat scream? It has that scene from Jurassic World in it where the dino gets eaten at the end by the water dinosaur? I need it because my dad loves dinosaurs and I want to show it to him. Thanks for the help!
Video of both of the dinosaur birds that @pizzaslaveunchained and I saw at the park the other day.
