final exam unit 9 Flashcards
Which type of galaxy is the most numerous in the universe?
a.
Spirals
b.
Lenticulars
c.
Ellipticals
d.
Irregulars
e.
Barred Spirals
d.
Irregulars
Galactic Cannibalism is:
a.
When a galaxy consumes itself by its black holes
b.
When a larger galaxy consumes a smaller galaxy
c.
When the universe expands so much it pulls apart a galaxy
d.
When a galaxy tears itself apart into dwarf galaxies
e.
When a smaller galaxy consumes a larger galaxy
b.
When a larger galaxy consumes a smaller galaxy
If the spectrum of an object is redshifted, what does that tell us about the relative motion of the light source?
a.
It has gotten redder
b.
It has shifted its position on the sky
c.
It is moving away from us
d.
It has gotten bluer
e.
It is moving towards us
c.
It is moving away from us
The Milky Way is currently consuming which galaxy?
a.
The Small Magellanic Cloud
b.
Andromeda
c.
The Large Magellanic Cloud
d.
Sagittarius Dwarf
e.
Sextans A
d.
Sagittarius Dwarf
Interstellar dust comes from…
a.
galactic cannibalism
b.
the material ejected from dying stars
c.
the explosion left over from the Big Bang
d.
galaxy collisions
e.
the material ejected from black holes
b.
the material ejected from dying stars
What did Lord Rosse discover with his Leviathan Telescope?
a.
The Zone of Avoidance
b.
Elliptical nebulae have spiral patterns
c.
Pulsating stars
d.
Dust in the spiral nebulae
e.
Pluto
b.
Elliptical nebulae have spiral patterns
How was the Shapley-Curtis debate finally resolved?
a.
Curtis discovered a star cluster in M31, and measured its distance using Hubble’s Law
b.
None of these are correct
c.
Hubble discovered a Cepheid in M31, and measured its distance using the period-luminosity relation
d.
Hubble discovered a supernova in M31, and measured its distance from its parallax
e.
Curtis discovered a nova in M31, and measured its distance from its parallax
c.
Hubble discovered a Cepheid in M31, and measured its distance using the period-luminosity relation
Where did the term ‘galaxy’ originate from?
a.
Heber Curtis used it to describe spiral nebulae, owing to the dusty appearance of their disks
b.
Immanuel Kant used it to describe star clusters, owing to their cloudy and round appearance
c.
William Herschel used it to describe planetary nebulae, owing to their cloudy, ring-like appearance
d.
The Ancient Greeks used it to describe the bright, milky-looking strip of light across the sky
d.
The Ancient Greeks used it to describe the bright, milky-looking strip of light across the sky
When someone points at ‘The Milky Way’ in the sky, what are they actually pointing at?
a.
The gaseous nebulae in the halo of the galaxy containing our solar system
b.
The tails of comets from the outermost region of the galaxy containing our solar system
c.
The disk of stars in the galaxy containing our solar system
d.
The spiral nebulae beyond the galaxy containing our solar system
c.
The disk of stars in the galaxy containing our solar system
The chemical element Calcium is the 20th element in the periodic table. What does this tell us?
a.
Calcium has 20 electrons in its nucleus
b.
Calcium has 10 protons and 10 electrons in its nucleus
c.
Calcium has 20 protons in its nucleus
d.
Calcium has 10 protons and 10 neutrons in its nucleus
c.
Calcium has 20 protons in its nucleus
Which of the following statements about Cepheids is FALSE?
a.
They periodically increase in brightness because the opacity of their surface causes their radiation pressure to push outwards and expand the star
b.
They can be seen in other galaxies
c.
They are luminous variable stars with short pulsation periods
d.
They emit intense radio emission from their poles due to their strong magnetic fields and high-speed spin
d.
They emit intense radio emission from their poles due to their strong magnetic fields and high-speed spin
Which of the following statements about the Island Universe theory is TRUE?
a.
The Orion nebula is an example of an Island Universe
b.
The Island Universe theory has been proven to be correct
c.
The Island Universe theory states that the Milky Way Galaxy is the only galaxy in the Universe
d.
Neither the Small Magellanic Cloud (SMC) nor Large Magellanic Cloud (LMC) are examples of an Island Universe
b.
The Island Universe theory has been proven to be correct
