Factoid - Tuesday, December 30, 2025
The U.S. Jet Propulsion Laboratory reported that an interstellar comet, named 3I/ATLAS, passed within 1.8 astronomical units (roughly 167 million miles) of Earth on 12/19/25, according to Gizmodo. The comet, which was first spotted on July 1, is the third interstellar object (originated from another solar system) astronomers have discovered passing through our solar system. Its coma is comprised mostly of carbon dioxide, whereas the comae of most other comets we have observed are predominantly water.
Posted on Tuesday, December 30, 2025 @ 10:13 AM

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