Astronomers Witness a Comet Reversing Its Rotation for the First Time
Astronomers have observed a rare event in space. For the first time, they watched a comet completely reverse its direction of rotation. NASA’s Hubble Space Telescope captured this surprising behavior of Comet 41P/Tuttle-Giacobini-Kresák during its close approach to the Sun in 2017.
The comet is a small icy body, only 0.6 miles (1 km) wide. Planetary scientist David Jewitt from UCLA led the study. He published the findings in The Astronomical Journal on March 26.
As the comet neared the Sun, solar heat caused its frozen ices to turn into gas. This process created powerful but unbalanced gas jets. These jets acted like tiny thrusters and strongly affected the comet’s spin.
According to the observations, the comet’s rotation slowed down dramatically. In May 2017, its spin rate decreased by three times. Later, Hubble images showed that the comet had stopped spinning and then started rotating in the opposite direction. It now completes one rotation every 14 hours.
David Jewitt compared the event to someone pushing a spinning merry-go-round in the opposite direction until it stops and reverses.
However, this dramatic change may signal the end for Comet 41P. Faster spinning can create strong centrifugal forces. These forces might tear the weak comet apart because its gravity is too weak to hold it together.
Moreover, the comet’s activity has dropped sharply. Its ice near the surface appears to be running out or is now covered by dust. Scientists believe the comet has been in its current orbit for about 1,500 years. It is now in its final stages.
Jewitt stated that Comet 41P will likely self-destruct very soon. As an ancient object in our solar system, its possible disappearance makes this discovery even more significant.
This rare observation gives scientists valuable insight into how comets evolve and eventually break apart over time.