Radiation astronomy/Comets/Quiz

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The comet Hale–Bopp in the night sky. Credit: Philipp Salzgeber.

Cometary radiation astronomy is a lecture studying the astronomical objects referred to as comets both as radiation and with radiation astronomy.

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.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

Quiz[edit | edit source]


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


2 Which of the following is not a radiation phenomenon associated with a comet?

elongated dust particles
high albedo
coronal mass ejection

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


4 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

5 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.


6 Observations of comets have benefited greatly from what phenomenon of cyan astronomy?

Cherenkov radiation
the electric blue glow of lightning
gas-expansion velocity decreases with increasing heliocentric distance
methane possesses prominent absorption bands in the visible
adaptive optics
the light of the neutral CN-radical

7 True or False, Comet West of 1976 is now settled into an orbit around Mars.


8 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.

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


10 On 19 May 1910, the Earth actually passed through the tail of what comet.

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


12 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.

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


14 True or False, Olivine is a silicate mineral that may be detected in cometary coma dust with green astronomy.


15 Yes or No, A cometary orbit about the Sun is a radiation astronomy phenomenon.


Hypotheses[edit | edit source]

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

See also[edit | edit source]

External links[edit | edit source]