Interstellar medium/Quiz

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Planetary Nebula Abell 39 is captured from the Mount Lemmon SkyCenter using the Schulman 32 inch Telescope. Credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona.

Interstellar medium is a lecture about an entity that exists between and around stars. It is a mini-lecture for a quiz section as part of the radiation astronomy course on the principles of radiation astronomy.

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Quiz[edit | edit source]


1 A NASA Hubble image of the Ring Nebula contains which of the following?

very hot helium blue
ionized oxygen emitting green
red light from ionized nitrogen
oxygen forbidden line emission
a forbidden line of sulfur

2 Yes or No, The amino acid glycine may have been discovered in the ISM.


3 Which of the following is not a studied characteristic of astrochemistry?

interstellar atoms
interaction of radiation with molecules
organics of interstellar origin
interstellar precursors

4 True or False, Black patches of space in certain areas encompassing a star formation are not dark nebulae but actually vast holes of empty space.


5 Which of the following is not a characteristic of super soft X-radiation?

electromagnetic radiation
ionizing radiation
usually hidden by interstellar absorption in the galactic disk
readily evident in external galaxies
have energies in the 0.09 to 2.5 keV range

6 True or False, By comparing astronomical observations with laboratory measurements, astrochemists can infer the elemental abundances, chemical composition, and temperatures of stars and interstellar clouds.


7 Complete the text:

The interstellar medium is the gas and

dust that pervade

space and is the matter that exists between the

within a

. It blends smoothly into the surrounding


8 True or False, The energy that occupies the same volume as the interstellar medium in the form of electromagnetic radiation is the interstellar radiation field.


9 Intragalactic super soft X-ray sources may be heavily reddened by?

10 True or False, The interstellar medium consists of an extremely dilute (by terrestrial standards) mixture of ions, atoms, molecules, larger dust grains, cosmic rays, and (galactic) magnetic fields.


11 Which phenomenon are associated with the heliosphere?

a region of space where the interstellar medium is blown away by the solar wind
a bubble in space
virtually all the material emanates from the Sun itself
Voyager 2
Voyager 1
the termination shock

12 True or False, The first gamma-ray telescope carried into orbit, on the Explorer 11 satellite in 1961, picked up fewer than 100 cosmic gamma-ray photons.


13 The point where the interstellar medium and solar wind pressures balance is called the

14 True or False, A dimming of light from stars due to absorption and scattering from dust in the interstellar medium is called interstellar extinction.


15 That part of outer space between planets and their star(s) is called?

16 True or False, The planetary nebula NGC 6543 has large concentrations of hydrogen, oxygen and ionized nitrogen.


17 WNM is an acronym for what?

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 The 111 → 110 rotational transition that occurs in the direction of four dark nebulae is likely from what chemical.

20 When ionization cones are present, what green characteristics are usually readily observed?

O III green emission line
green continua
biconical structure
a common cone axis and apex
ionized gas
neon clouds

21 Complete the text:

Match up the item letter with each of the possibilities below:
Interstellar comet - A
Neutrals - B
Geminga - C
star formation region - D
Local Hot Bubble - E
H II regions - F
Ring Nebula - G
molecular cloud - H
supernova remnant - I
Messier 17 - J
empty space - K












See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}