Interstellar comet 3I/ATLAS is about to make its closest appearance to Earth today. This event is significant for astronomers studying the object. The comet offers a rare opportunity to examine matter from another star system. Scientists are observing how it behaves when exposed to sunlight. The comet poses no danger to Earth.Interstellar comet 3I/ATLAS is about to make its closest appearance to Earth today. This event is significant for astronomers studying the object. The comet offers a rare opportunity to examine matter from another star system. Scientists are observing how it behaves when exposed to sunlight. The comet poses no danger to Earth.