# Astronomy/Backgrounds/Quiz

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

Background astronomy is a lecture and an article as part of the astronomy department's astronomy project. It has been included in the 2016 fall version of principles of radiation astronomy as a lecture.

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

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## Quiz

 Point added for a correct answer: Points for a wrong answer: Ignore the questions' coefficients:

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

 Yes No

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 gravity 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.

 Yes No

4. A cosmic ray may originate from what astronomical source?

 Jupiter 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.

 Yes No

6. Complete the text:

 Cosmic rays with energies over the energy of 5 x 1019 interact with photons to produce via the ${\displaystyle \Delta }$ 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.

 Yes No

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:

 The (CIB) causes a significant attenuation for very high energy through Compton , 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 rotation watery surface spots

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) CMB meson background cosmic gamma-ray background (CGB) cosmic radio background

## Hypotheses

Main source: Hypotheses
1. Sometimes the apparent background is actually the signal.