What space dust can teach us about Earth’s climate history

What space dust can teach us about Earth’s climate history

For billions of years, Earth has been bombarded by tiny particles of rock and metal from space. When these extraterrestrial specks hit the upper atmosphere at hypersonic speeds, they burn and melt into glowing trails—what you know as shooting stars. But what’s left behind isn’t just dust. Some of these space travelers transform into small, spherical particles called cosmic spherules. Most of these particles are smaller than a grain of sand, but …