On May 1, 1949, Neptune's moon Nereid was discovered by the Dutch astronomer Gerard Kuiper. [‘On This Day in Space’ Video ...

Saturn and Neptune have been near neighbors for a while. By the last day of January, the two planets are just 1.7° apart, visible in the early-evening hours and setting before midnight. About 90 ...

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Looking for a sky event this week? Check out our full Sky This Week column. January 30: The Moon and Jupiter share Gemini Saturn and Neptune have been near neighbors for a while. By the last day of ...