Dimorphos's Orbit Might Be Continuing to Decay, a Year After the DART Impact
After NASA's DART mission slammed into asteroid Dimorphous in September 2022, astronomers measured that the orbital period had decreased by about 32 minutes. The dinosaurs were avenged. Astronomers measured the orbital period a month later and discovered that it had increased to 34 minutes - 2 minutes longer than the first measurements. Even though it was a single impact from DART, some force continued to slow the asteroid's orbit, and astronomers don't know what that mechanism might be.
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