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Dust in the Solar Wind

In Comets by Brian Koberlein0 Comments

An unusual new comet has been discovered. Or perhaps it should be called an asteroid. Whatever it is, it has six tails and is called P/2013 P5. It was first observed the end of August this year, but now a new paper in Astrophysical Journal Letters gives the initial results of observations so far.

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Point of Origin

In Comets by Brian Koberlein3 Comments

Because of their gradual evaporation, periodic comets don’t last long on a geologic scale. Over time they will disappear. So it’s generally thought that periodic comets were once non-periodic ones that were perturbed by Jupiter or other planets into a short periodic orbit. Of course that raises the question: from where do the non-periodic comets come?