The melting of materials seems like a simple phenomenon. However, when their thickness is reduced to just a few atoms, established rules waver. In this two-dimensional mode, new states emerge ...

Recent advances in cometary science have yielded unprecedented insights into the composition, dynamics and evolution of cometary nuclei and their surrounding comae. Studies now demonstrate that comets ...

Over the past 50 years, astronomers have made dozens of major discoveries that help explain the nature and origins of the universe. They’ve measured the cosmic microwave background, or leftover ...