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73 terms

Astronomy Final T/F

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true
More massive white dwarfs are smaller than less massive white dwarfs
false
our sun will likely undergo a nova event in about 5 billion years
false
no light can escape a black hole, but things such as gamma rays, x-rays, and neutrinos can
false
all massive-star (>8 solar mass) supernova leave behind black holes as remnants
false
suppose that, you sit in your classroom, you see two balls fall to the floor and hit at exactly the same time. According to the theory of relativity, other people sitting in the classroom with you will not agree that the balls hit the floor at the same time.
true
the general theory of relativity deals with the effects of acceleration, but the special theory of relativity does not take acceleration into account
true
according to the theory of relativity, the length of a moving object in the direction of the objects motion decreases
true
different observers can disagree about the speed of a baseball, but they cannot disagree about the speed of a light beam
true
according to the theory of general relativity, our perception of gravity arises from the curvature of spacetime
false
the theory of general relativity proves that wormholes like those used in science fiction cannot exist
false
although many scientists believe general relativity to be correct, there is no experimental evidence supporting the predictions this theory makes about time.
true
time runs more slowly in a stronger gravitational field, according to the theory of general relativity
true
Sir Arthur Eddington helped proved the theory of general relativity by showing that the mass of the Sun can produce a shift in the apparent position of distant stars
false
A black hole will exist forever, once its formed
true
stars are chemical factories, producing more complex elements from simpler elements
true
most stars are born in clusters
false
the mass of stars can never change
false
In a binary star system, the maximum apparent doppler shift occurs when the two stars are moving perpendicular to the observers line of sight
false
there is no limit to the mass with which a star can be born
true
we believe a supermassive black hole exists at the center of the Milky Way galaxy
true
gamma-ray bursts are believed to mark the birth of a black hole
false
the sun is located at the edge of the galaxy, approximately 100,000 light-years from the galactic center
true
the death of a star may trigger the formation of new stars
false
almost all elements heavier than hydrogen and helium were made by novae
true
most of the current star formation in the milky way occurs in spiral arms
false
the observable universe is the same size today as it was a few billion years ago
false
earth is precisely 1 AU from the Sun
false
Copernicus was the first person to suggest a sun-centered solar system
true
scientific theories can never be proved true beyond all doubt
false
speed and velocity are the same thing
false
Kepler deduced his laws of planetary motion once Newtown had published his universal law of gravitation
false
there is no gravity in space
true
the shorter the wavelength of light, the higher its frequency
false
doubling the distance between two objects halves the gravitational force between them
false
energy and power are different words for the same thing
false
the greater the wavelength of light, the greater its energy
false
x-rays, because they have more energy, travel through space faster than visible light
true
the atomic nuclei of the same element always have the same number of protons
false
atomic nuclei consists of protons and electrons
true
the energy levels of electrons vary from one element to another
false
emission lines from different ionization states of the same element appear in the same place in the spectrum
false
any object moving relative to Earth will have a Doppler Shift
false
the energy levels of an element and its ion are the same
false
sunspots are cooler than the surrounding region of the Sun's surface
true
you are currently emitting electromagnetic waves
true
the more distance a star, the smaller its parallax
true
spectral type, surface temperature, and color all describe the same basic characteristics of a star
true
two stars both lie on the main sequence, Star X is spectral type A, while Star Y is spectral type G. Therefore, Star X is more mass
false
most stars on the main sequence fuse hydrogen into helium in their cores, but some do not
false
the apparent brightness of a star depends only on its luminosity
false
Stars are continually forming in the halo of our Galaxy today
true
spiral galaxies have more gas, dust, and younger stars than elliptical galaxies do
true
galaxy mergers take hundreds of millions of years to complete
true
a protogalactic cloud with slow star formation is more likely to form a spiral galaxy than an elliptical galxy
false
massive-star supernovae and white dwarf supernovae work equally well as a standard candles for measuring cosmic distances
true
If inflation really occurred, then our observable universe is only a tiny portion of the entire universe born in the Big Bang
false
The Big Bang predicts that one in four atoms in the universe is helium
true
The Milky way is moving further away from most other galaxies in the Universe
false
Any object moving relative to Earth will have a Doppler shift
false
Scientists believe in the theory of relativity because it was invented by Einstein, even though there is very little experimental evidence supports it
false
As predicted by general relativity, time runs slightly slower at the peak of Mount Everest than it does at sea level
true
two stars both lie on the main sequence, Star X is a spectral type A, while Star Y is spectral type G. Therefor, Star X is more massive than Star Y
false
all stars spend approximately the same amount of time on the main sequence
false
no visible light can escape a black hole, but things such as gamma-rays, x-rays and nuetrinos can
true
the larger the value of Hubble's constance, the more rapid the expansion of the universe and hence the younger the universe
true
photographs of many young stars show long jets of material apparently being ejected from their poles
false
the greater the wavelength of light, the greater its energy
true
the shorter the wavelength of light, the higher its frequency
true
the proton-proton chain converts four hydrogen nuclei into one helium nucleus
false
two stars have the same luminosity, Star X is spectral type F, while Star Y is spectral type K. Therefor, Star X is larger in radius than Star Y
true
in any star cluster, stars with lower masses greatly outnumber those with higher masses
false
the most massive stars generate at the end of their lives by fusing iron in their cores
true
more massive white dwarfs are smaller than less massive white dwarfs