Can pupils hunt for micrometeorites at school?
Yes, with care. Collecting dust from a roof gutter and searching it with a magnet and microscope is a real research technique, but genuine micrometeorites are rare and need expert confirmation.
Micrometeorite hunting makes a fascinating extended project and teaches real scientific methods, including contamination control and scepticism.
In 2016, researchers showed that genuine micrometeorites can be found in sediment collected from city rooftops, especially flat roofs and gutters, where dust collects for years. Finding them, however, is like looking for a needle in a haystack: most magnetic particles in rooftop dust are from industry, vehicles, building materials and soil.
Method. With the site manager's permission and proper supervision, collect debris from a gutter or flat roof; pupils should not climb or work at height, so staff must do any collection. Wash the material through sieves in a tray of water, keeping the fraction between about 0.1 and 0.4 millimetres. Dry it, then pass a magnet wrapped in plastic film over it to collect magnetic particles. Examine these under a binocular microscope.
What to look for. Melted micrometeorites, called cosmic spherules, are usually round, often with a dimpled or barred surface, metallic sheen or glassy look. Industrial spherules are much more common; many are perfectly smooth and shiny.
Scientific honesty. Teach pupils that confirming a micrometeorite needs electron microscopes and chemical analysis. Their candidates are 'possible' finds. Photograph them and compare with published images.
Safety: wear gloves when handling gutter debris, which may contain bird droppings and sharp fragments, and wash hands thoroughly. The project works well for science clubs or extended investigations.