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Comets/Quiz

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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.

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

You are free to take this quiz based on the lecture comets at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{radiation astronomy resources}} template. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

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Enjoy learning by doing!

Quiz

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

Yes
No

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

TRUE
FALSE

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.

Yes
No

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

TRUE
FALSE

6 Complete the text:

Sun-grazing

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.

Yes
No

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.

Yes
No

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.

Yes
No


Hypotheses

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Main resource: Hypotheses
  1. Some comets originated with the apparent breakup of the former sky-god Ouranus.

See also

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