Data from two satellites reveal a rather stunning cloudless view of Earth, complete with an impressive 80 trillion pixels. The mosaic of images was taken by the Sentinel-2 satellites, operated by the European Space Agency (ESA), of which there are…

Ancient star explosions revealed in the deep sea. The interstellar medium is shaped by nearby supernova explosions. Ejecta containing fresh nucleosynthetic products may travel through the solar system as a temporary passage, or the solar system may navigate local clouds…