5 January – NASA announces that it has awarded contracts to seven companies to study technologies for the Habitable Worlds Observatory, a next-generation telescope that could launch in the 2040s.[8][9]
7 January – Astronomers using data from the Vera C. Rubin Observatory report that 2025 MN45 has the fastest spin of any known asteroid larger than 0.5 km (0.31 mi) in diameter, completing one rotation every 1.88 minutes.[10]
13 January – The European Copernicus Climate Change Service reports that 2025 was the world's third hottest year on record (2024 was the hottest and 2023 the second hottest). In Antarctica, the average annual temperature was the warmest since measurements began and in the Arctic, it was the second highest.[11]
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