Which object is the second confirmed interstellar visitor besides 'Oumuamua and 3I/ATLAS?
Answer
2I/Borisov
3I/ATLAS is confirmed as the third object originating from outside the stellar neighborhood to pass through our solar system. The other two confirmed members of this exclusive club, detected in quick succession, are 'Oumuamua, discovered in 2017, and 2I/Borisov, which was discovered in 2019. According to the provided data markers, 2I/Borisov was distinguished by exhibiting clear cometary activity, showing a definite tail and coma, unlike the initial ambiguity surrounding 'Oumuamua's appearance.
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Newly-discovered 3I/ATLAS comet makes closest approach to Earth
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