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“…What MeerKAT specifically detected were lines of radio absorption by hydroxyl radicals, that is, OH molecules, a pattern that would be consistent with typical comet activity. The lines appear as absorption because 3I/Atlas was very close to the sun and the observing geometry favors absorption over emission. This is the phenomenon explained in WIRED a few days ago when the controversy about non-gravitational acceleration arose: When comets reach their closest point to the sun, they sublimate ice into space and receive a greater amount of radiation. This also causes them to alter their trajectory.
… Will the MeerKAT detection be enough to put an end to conspiracy theories about 3I/Atlas? Likely not, and at least the debates have heightened the general public's awareness of and interest in astrophysics. In the meantime, you can view the trajectory of comet 3I/Atlas here. And don't forget to mark December 19 on the calendar—that's when the interstellar guest will reach its closest point to Earth.“
The First Radio Signal From Comet 3I/Atlas Ends the Debate About Its Nature
An observatory detected the first radio signal from the interstellar object 3I/Atlas. Here’s what it means.


