Radiation astronomy/Cyans/Quiz

Cyan astronomy is a lecture as part of the astronomy department course on the principles of radiation astronomy.

The visual image shows the natural cyan color of planetary nebula NGC 7048. Credit: Aladin from CDS.

You are free to take this quiz based on cyan astronomy at any time.

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Enjoy learning by doing!



1 Soil samples from the mare of the Moon reflect primarily cyan due to the presence in the soils of what?

2 One of the substances discovered in the tail of Halley's comet by spectroscopic analysis is the toxic gas

3 Which of the following is not a prominent contributor associated with the bluish color of water on Earth?

the blue sky
dissolved organic matter
decomposition processes from dead organic matter such as plants
highly organic soils

4 Yes or No, Boron has an emission line in the cyan.


5 Complete the text:

Match up the radiation letter with each of the detector possibilities below:
Optical rays - L
Visual rays - M
Violet rays - N
Blue rays - O
Cyan rays - P
Green rays - Q
Yellow rays - R
Orange rays - S
Red rays - T
multialkali (Na-K-Sb-Cs) photocathode materials



broad-band filter centered at 404 nm


thallium bromide (TlBr) crystals


18 micrometers FWHM at 490 nm

wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO)


6 True or False, Hydrogen has an emission line in the cyan.


7 Cyan astronomy observation is performed all around the surface of the Earth by?

8 True or False, The red shift cannot affect cyan stars.


9 Which of the following is not a cyan characteristic of solar active regions?

yellow spectral lines are 1.4 % shallower at solar maximum
coronal clouds
spot central meridian passage
a surface coverage of at least 95%.

10 True or False, Beryllium has an emission line in the cyan.


11 Which of the following is involved in planetary astronomy more so than planetary science?

the occurrence of cyan rock types on the surface of rocky objects
the Earth and other rocky objects have a cyan mineral containing mantle
checking equations about complex systems
the advantages of a 490 nm band pass
digging holes in the surface of the Moon
surface temperatures low enough to produce methane lakes

12 True or False, Cyan Bremsstrahlung radiation is not detected from the Sun because the photosphere isn't ionized enough to produce it.


13 Various cyan radiation observatories occur at different altitudes and geographic locations due to what effect?

the presence of oceans on the Earth
locally available carving tools
light pollution
most astronomical objects are observed at night
currently dormant volcanoes seldom erupt
human habitation increases near an astronomical observatory

14 True or False, In the first derivative of Planck's equation to generate a wavelength, temperature pair like (495 nm, 6100 K), the constant c2 has units of nm K.


15 Using the equation   what temperature corresponds approximately to a Planckian peak wavelength of 476 nm (Use c2 = 1.438833 cm K.)?

6440 K
6300 K
5170 K
6100 K
5870 K
6250 K

16 True or False, The Hubble Space Telescope currently uses the Wide Field Planetary Camera (PC-2) with its F492M filter among others for green astronomy.


17 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

18 True or False, The Hβ emission line does not appear when the F492M filter is used on the Hubble Space Telescope because its wavelength is 486.1 nm.


19 Cyanogen is a natural poisonous gas composed of what likely source of cyan?

20 True or False, There are cyan or cyan mineral containing meteorites.


21 Complete the text:

Methane possesses prominent

in the visible and near-infrared (IR) making

aquamarine or

in color.

22 A cyan color can result from a freshly excavated high-Ti?

23 True or False, A dominant group in cyan astronomy differs from a control group in that it rules the treatment of the control group.


24 Evidence that demonstrates that a model or idea in cyan astronomy versus a control group is feasible is called a


25 True or False, A control group may be used in cyan astronomy to demonstrate no effect or a standard effect versus a novel effort applied to a treatment group.


26 Complete the text:

A short or

realization of a certain

or idea to

a treatment's feasibility in cyan astronomy is called a proof of


27 True or False, Pure cyan astronomy involves no doing apart from itself.


28 Complete the text:

A proof-of-concept structure, including a control group, consists of

, procedures, findings, and


29 True or False, The purpose of a treatment group in cyan astronomy is to describe natural processes or phenomena for the first time relative to a control group.



  1. Quiz questions about cyan should also include bluish-green, greenish-blue, green-blue, or blue-green.

See alsoEdit

External linksEdit

{{Radiation astronomy resources}}