COMET 3I/ATLAS was approximately 169,150,000 miles away traveling at approximately 125,000 mph when I imaged it early morning 12/20/25 . It was one day past its closest point of approach to Earth.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The Northern Hemisphere’s shortest day and longest night of ...

Although temperatures have been dropping for weeks, winter doesn’t officially begin until Saturday. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content.

Meteorologists consider the arrival of December as the start of winter, the beginning of the coldest three months of the year. Astronomically, the season started a little after 10 a.m. on Sunday, ...

The winter solstice this year occurs on Dec. 21. The winter solstice marks the shortest day and longest night of the year. After Dec. 21, the hours of daylight will slowly increase until the summer ...