According to new research, some of Earth’s atmosphere was brought to the planet by comets billions of years ago. This artwork shows a rocky planet being bombarded by comets. Image credit: NASA / JPL-Caltech. The mystery of how the Earth’s atmosphere was formed has long baffled scientists. Some think comets might have originally brought some of the water, organic and atmospheric molecules to Earth that now make up its life. Now a new study, led...
