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Astronomy

QuestionAnswer
The band of the Milky Way, visible at night in dark locations, implies that we live in a galaxy of stars with a shape of a sphere
Shapley, in order to understand the shape of our galaxy used globular clusters
Our galaxy is roughly____ across 100,000lyr
The sun is found in the ___ of the galaxy disk
Our milky way has spiral arms true
the core of our milky way is in the constellation libra false
blue stars in the disc of the galaxy are called pop I
in astronomy elements heavier than helium are called metal
Stars that are pure hydrogen and helium and have not been found yet are called pop III
The earliest type of stars in the galaxy Pop III
Computers today cannot model stellar formation and motions in our galaxy false
The pleiades show the characteristic blue color a reflection nebula
Cold hydrogen gas produces___ electromagnetic radiation by its spin flip 21 cm
When light travels through thick dust and gas and all visible light is stopped, this is known as___ extinction
As light travels through dense gas, the gas scatters the blue waves and the light slowly reddens
An HII region is cold hydrogen False
An HI region is ionized hydrogen false
The rotation curve of the galaxy implies that inner stars are moving faster and outer stars are moving slower
This phenomenon creates spiral arms and recreates them density wave
The problem which should destroy our spiral arms over time is known as winding problem
when supernovas promote more star formation this is called self propagating star formation
most of the galaxy is made of dark matter true
the core of the galaxy is called Sagittarius a
The redshift of distant galaxies was discovered by Edwin hubble
The area of our galaxy that we cannot see beyond is called the zone of avoidance
These objects help us, by their variabiltiy to measure distance to galaxies cepheids
hubbles constant is about 70 km/sec/mpc
nearby galaxies may not show a redshift true
An S galaxy is classified as a Spiral
SB galaxies are classified as spiral-barred
dwarf galaxies may be the____ of ordinary galaxies building blocks
SO galaxies are generally considered to be___ galaxies with their gas removed spiral
When one galaxy punches a hole through another galaxy it leaves a square galaxy behind false
Starburst galaxies are among the most luminous of galaxies true
galaxy collisions in rich clusters result in this type of galaxy giant elliptical galaxy
Our local group is composed of about ____ members 40
galaxy clusters with few members are known as__ clusters poor
As assemblage of many superclusters that are pulling on our supercluster has been called the great attractor
The magellanic clouds are part of our local group true
Quasars were originally indentified because many of them are bright in radio waves
An abnormally luminous spiral galaxy is called seyfert galaxy
Located around a black hole this is a very intense radiation source accretion disk
Electrons spiraling along magnetic lines cause synchotron radiation
AGN's are thought to be reinvigorated quasars false
Quasars are always large radio sources true
A large galaxy is essentially a small amount of normal matter embedded in a halo of a large amount of dark matter
Dark matter may be compose of this particle WIMP
The halo of our galaxy may have these large objects in it to account for dark matter MACHO
The approximate amount of dark matter in our galaxies halo is ____ times more than our visible matter 10
The dark matter halo of our galaxy is about 2 times the visible matter false
The study of the structure and evolution of the universe is called cosmology
Hubble's constant is_____ km/sec/mpc 70
The time it took galaxies to get to separation we see is called hubble time
This principle implies that there is no center to the universe cosmological principle
Hubble's law states that the farther the galaxy, the faster the recession false
The lack of a center to our universe is called Hubble's law false
The cosmic microwave background is radiation resulting from the beginning of the universe
His question made a paradox of why the universe is not infinite in all aspects Obler
The universe has matter evenly distributed; this principle is called___ homogeneous
The maximum distance that light can travel during the age of the universe is called cosmic horizon
Dark matter began clumping even before the last scattering epoch true
The CMB is about 3k true
Einstein's original theory of general relativity predicted this, but Einstein could not believe it was true, and added the cosmological constant to his theory to prevent this prediction the existence of dark matter
The value of omega which gives you a recollapsing universe is >1
In which type of universe would the angles of a triangle add up to more than 180 degrees? positive curvature and closed
The factor needed to find out if the universe expands forever or recollapses is the critical density
If omega is greater than 1, then the universe is open false
If omega is 1, then the universe is at critical density true
The time of the early universe that produced more gravity from radiation than from dark matter is called radiation era
Unification theories are called GUT's
The initial curves universe expanded and then flattened
What is the inflationary time of the universe the time when radiation dominated the universe
GUTs are designed to unify the forces of nature true
The early universe underwent deflation false
Dark matter makes up___of the universe 23%
Heat death is when a star ceases fusing any elements
What is the difference between dark matter and dark energy? Dark matter is attractive and slows the expansion. Dark energy is repulsive and accelerates the expansion.
Based on supernova studies, it appears the universe is___ accelerating
Dark energy is another name for cosmological constant true
As the expansion of the universe accelerates, parts of the universe that we cannot not see will become visible true
Created by: 100002861602306
 

 



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