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JUST IN: "A huge planet with a long name – IRAS 04125+2902 b – is really just a baby: only 3 million years old," NASA recently explained. "And because such infant worlds are usually hidden inside obscuring disks of debris, it is the youngest planet so far discovered using the dominant method of planet detection." (For reference, our middle-aged planet, Earth, is some 4.5 billion years old.)