Look up, skywatchers. A striking celestial event is underway this week, as the Cold Supermoon, the final full moon of 2025, rises on 4 December. According to Live Science, the moon becomes officially full at 6:14pm EST and will appear especially large at moonrise, when it sits low near the horizon.
This year's Cold Moon is also the second-biggest full moon of 2025, arriving as the third in a consecutive series of four supermoons. A supermoon occurs when a full moon aligns with perigee, the Moon's closest point to the Earth. As NASA explains, a supermoon can look up to 14% larger and around 30% brighter than a typical full moon.
