Background astronomy/Quiz

Background radiation astronomy, or background astronomy is a lecture that is part of the radiation astronomy department's radiation astronomy project. It has been included since the 2016 fall version of principles of radiation astronomy as a lecture.

This image depicts the two gigantic gamma-ray bubbles at the heart of the Milky Way. Credit: NASA's Goddard Space Flight Center.

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

To improve your scores, read and study the lecture, the links contained within, listed under See also, External links, and in the {{principles of radiation astronomy}} templates. 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


1 Yes or No, The temperature distribution of the intergalactic medium (IGM) depends on whether or not there exist strong galactic winds.


2 Which of the following are theoretical radiation astronomy phenomena associated with a satellite in orbit around the Earth?

background radiation
a charged particle wind which emanates out of a beam line
near the barycenter for the Earth-Moon system
swirls of tan, green, blue, and white in the water
electric arcs
chlorophyll-containing phytoplankton aloft in the upper atmosphere

3 Yes or No, Outflow from the galaxy M82 of PAHs is embedded in a gaseous wind.


4 A cosmic ray may originate from what astronomical source?

the solar wind
the diffuse X-ray background
Mount Redoubt in Alaska
the asteroid belt
an active galactic nucleus

5 Yes or No, High energy neutrinos may interact to produce a large cascade of particles.


6 Complete the text:

Cosmic rays with energies over the

energy of 5 x 1019

interact with

photons to produce

via the   resonance.

7 Yes or No, The main components of background noise in neutron detection are high-energy photons, which aren't easily eliminated by physical barriers.


8 Which of the following are astrophysical components contributing to the sky background?

sets of point sources like faint asteroids
a charged particle wind
Galactic stars
far away galaxies
swirls of tan, green, blue, and white in the water
dust in the Solar System
dust in the Milky Way
dust in intergalactic space

9 Complete the text:

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

, procedures, findings, and


10 Which of the following are cold dark matter gamma rays?

expected signal comparable to background
annihilation radiation
a pronounced cosmic-ray halo
difficult to separate from a dark halo
dwarf spheroidals
weakly interacting massless particles

11 Complete the text:


(CIB) causes a significant attenuation for very high energy




and electron-positron pair production.

12 Which of the following are likely associated with a green emission line control group?

rocky objects
high peak to background
plasma objects
a G2V photosphere
watery surface

13 With respect to electromagnetic radiation, which of the following are types of backgrounds?

cosmic optical background (COB)
cosmic dust
cosmic ultraviolet background (CUVB)
cosmic X-ray background (CXB)
cosmic cyanogen background (CCB)
cosmic infrared background (CIB)
rocky objects
diffuse extragalactic background radiation
extragalactic background light (EBL)
meson background
cosmic gamma-ray background (CGB)
cosmic radio background

Hypotheses edit

  1. Sometimes the apparent background is actually the signal.

See also edit

External links edit

{{Radiation astronomy resources}}