Comets is a lecture studying the astronomical objects referred to as comets.

Visual photograph of Comet West in early March 1976 shows red gases coming off the comet's head and multicolor dust tail. Credit: Peter Stättmayer (Munich Public Observatory) and ESO.

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Quiz edit


1 Yes or No, A comet is a small solar system body that has a solid icy nucleus.


2 True or False, An hypothesized Oort cloud or protoplanetary disc has been observed around other stars.


3 Which of the following are radiation astronomy phenomena associated with comets?

low albedo
relatively featureless
cyanogen detected
neutron emission
rotationally asymmetric
meteor emission
changes in its tail

4 Yes or No, When near the Sun a comet can also have an extremely tenuous atmosphere called a coma which can grow into a large and bright tail.


5 True or False, Comet West of 1976, pictured at the top, is now settled into an orbit around Mars.


6 Complete the text:


almost never re-emerge, but their

destruction near the

has only recently been observed directly, while

impacts have not yet been seen, nor impact theory developed.

7 Yes or No, Nuclei are destroyed by ablation or explosion in the chromosphere, producing flare-like events with cometary abundance spectra.


8 Yes or No, The death of a comet at r ~ R has been seen directly only very recently using the SDO AIA XUV instrument.


9 Complete the text:

The phenomenon of

induced sunquakes - waves in the

- discovered by Kosovichev and Zharkova (1998) and now widely studied (e.g. Kosovichev 2006) has only recently been

should also result from the

impulse delivered by a cometary impact.

10 Yes or No, A typical comet nucleus has an albedo of 0.04.


Hypotheses edit

  1. Some comets originated with the apparent breakup of the former sky-god Ouranus.

See also edit

External links edit