Interstellar comet 3I/ATLAS — the third confirmed object from outside our solar system — made its closest approach to Earth today, Dec. 19, passing harmlessly at about 1.8 AU while NASA and other observatories released new close-up images and data for rapid study by scientists worldwide[6][4].

References:
1. https://science.nasa.gov/solar-system/skywatching/whats-up-december-2025-skywatching-tips-from-nasa/
2. https://www.youtube.com/watch?v=TigQRa5XzOk
3. https://www.youtube.com/watch?v=Jaqhulggh0c
4. https://abcnews.go.com/US/nasa-unveils-new-close-images-massive-comet-solar/story?id=127684380
5. https://www.iflscience.com/interstellar-comet-3iatlas-will-make-its-closest-approach-to-earth-this-month-just-270-million-kilometers-away-81781
6. https://science.nasa.gov/solar-system/comets/3i-atlas/3i-atlas-facts-and-faqs/