Stars/Galaxies/Quiz

Galaxies is a lecture studying a specific type of astronomical objects. It is also a mini-lecture for a quiz section as part of the radiation astronomy course on the principles of radiation astronomy.

This image shows the spiral galaxy Messier 100. Credit: NASA, STScI.

You are free to take this quiz based on galaxies 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 {{stars 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

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

1 The galaxy image at the top of the page has which type of rotational symmetry?

	one-fold - ⊙
	two-fold - ⊖
	three-fold - ▲
	four-fold - ◈
	five-fold - ✪
	six-fold - ✱

2 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

3 Yes or No, Any small luminous green dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be an active galactic nucleus.

	Yes
	No

4 The use of the principle of line of sight allows what phenomenon to be determined?

	the Moon is closer to the Earth than the Sun
	the planet Mercury is nearer to the Earth than Venus
	any cumulus cloud overhead follows the Sun across the sky
	the plane of the Earth's orbit around the Sun is in the plane of the galaxy
	the surface of the photosphere of the Sun is hotter than the surface of Mars
	lightning always precedes rain

5 True or False, As a galaxy is made up of millions or billions of stars, a solitary star does not exist in a galaxy.

	TRUE
	FALSE

6 Spiral galaxies have which of the following in common?

	spiral arms
	a spheroidal shape
	may appear lenticular
	is irregular
	arms of younger stars
	may contain star clusters
	dust lanes

7 Phenomena associated with the Milky Way are?

	spiral arms
	a spheroidal shape
	a standard to differentiate dwarf galaxies
	often referred to as the Galaxy
	arms of younger stars
	contains star clusters
	dust lanes
	extended red emission (ERE)
	a faint galaxy heavy with dark matter may orbit it
	larger than the Andromeda galaxy

8 Complete the text:

Match up the item letter with each of the possibilities below:

Einstein ring - A

stellar nebula - B

Andromeda galaxy - C

Triplet galaxies interacting - D

Hubble galaxies - E

Dark matter halo simulation - F

Fairall 9 (Seyfert galaxy in X-rays) - G

Tycho Brahe observatory, remotely controlled telescope, captured galaxy - H

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9 Complete the text:

Match up the item letter with each of the possibilities below:

Sa - A

Sb - B

Sc - C

SBa - D

SBb - E

SBc - F

Irr - G

S0 - H

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File:NGC 2859.jpg .

10 Complete the text:

Match up the item letter with each of the possibilities below:

E0 - A

E1 - B

E2 - C

E3 - D

E4 - E

E5 - F

E6 - G

E7 - H

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at left .

Hypotheses

Main resource: Hypotheses

1. Galaxies are primarily a product of the galactic magnetic field.

See also

• Astronomy/Quiz
• Radiation astrochemistry/Quiz
• Radiation astrogeography/Quiz
• Radiation astrohistory/Quiz
• Radiation astronomy/Quiz
• Theoretical radiation astronomy/Quiz

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• NASA's National Space Science Data Center
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Spacecraft Query at NASA
• Universal coordinate converter

{{Principles of radiation astronomy}}