NASA is undertaking a vast observation effort for comet 3I/ATLAS. This interstellar visitor is being studied by multiple spacecraft and telescopes. Researchers aim to understand its composition and origin by comparing it with solar system comets. The comet will be closest to Earth on December 19, offering a viewing opportunity with telescopes.NASA is undertaking a vast observation effort for comet 3I/ATLAS. This interstellar visitor is being studied by multiple spacecraft and telescopes. Researchers aim to understand its composition and origin by comparing it with solar system comets. The comet will be closest to Earth on December 19, offering a viewing opportunity with telescopes.