DART actually got a big assist from the asteroid itself. (via PopSci)
found it took the asteroid more than 23 days to return to its pre-impact levels of brightness in the night sky.
The analysis also found that ejecta appeared reddish at the time of impact, which is somewhat mysterious. “Typically, active bodies appear bluer in color on average than their inactive counterparts,” the researchers write in the paper, giving the examples of active comets versus inactive Kuiper Belt objects.
“I cheered when DART slammed head on into the asteroid for the world’s first planetary defense technology demonstration, and that was just the start,” NASA administrator for its Science Mission Directorate, Nicola Fox,
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