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Sunlight can speed up or slow down the spin of small asteroids, according to a trio of related papers appearing this week. The discovery offers the first direct evidence of a predicted asteroid behavior.
"The solar system is a very dynamic place, and our star affects all worlds—even small ones," said Patrick Taylor, a graduate student at Cornell University in New York State.
Taylor co-authored two studies that will appear tomorrow in the early online journal Science Express.
The third study, led by Mikko Kaasalainen of the University of Helsinki in Finland, appears today in the early online edition of the journal Nature.
All three papers looked at a phenomenon called the YORP (Yarkovsky-O'Keefe-Radzievskii-Paddack) effect.
When the sun warms an asteroid's surface, the rocky object reradiates heat into the void.
Heat emissions produce a slight recoil that alters the asteroid's spin—the same principle by which light shined on a pinwheel can sometimes cause it to rotate even without a breeze.
