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From the cratered companion that lights Earth's night sky to the hundreds of icy worlds circling the Solar System's giant planets, moons are among the most fascinating objects in space. Over the past few decades, powerful telescopes and deep-space missions have transformed our understanding of these natural satellites, revealing hidden oceans, active volcanoes, methane lakes and even environments that could potentially support life.

Interstellar comet 3I/ATLAS has given astronomers an opportunity they rarely expect to receive. Unlike the countless icy bodies that circle the Sun, this object formed around another star before drifting into our solar system, carrying frozen material that has remained largely unchanged for billions of years.

Around three billion years ago, long before animals, forests, or even complex life existed, a large asteroid struck a young Earth. The collision happened at a time when the planet looked very different from today, with early continents still taking shape and geological processes operating in conditions that remain difficult to reconstruct.