Harvard researcher Avi Loeb says comet 3I/ATLAS weighs 33 billion tons and spans 3.1 miles, making it far larger than previous interstellar visitors.
The motion of 3I/ATLAS that helped trace its trajectory revealed a non-gravitational acceleration, which revealed the size of the comet.
NASA's Mars rover Curiosity acquired this image of the ridge in front of it, which it was scheduled to drive down the weekend of Sept. 27-28, 2025. To either side of the ridge are two hollows, ...
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