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Story summary
- The SETI Institute’s analysis confirms that interstellar comet 3I/Atlas is a natural object, not an alien artifact.
- SETI’s seven-hour scan detected about 74 million narrow-band signals, which filtered to roughly 200 Earth-based sources.
- NASA spacecraft observed the comet pass within 19 million miles of Mars and 167 million miles of Earth in December, estimating its size between 1,444 feet and 3.5 miles and an age up to 11 billion years.
