The major evidence for the idea that the expansion of the universe is accelerating comes from observations of:
white dwarf supernovae
. Which of these possible types of universe would not expand forever? Spiral galaxy rotation curves are generally fairly flat out to large distances.
How could the universe be accelerating?
The radiation-filled Universe dilutes faster; it’s
density drops as the volume expands
, while each individual photon also loses energy due to its cosmological redshift. The energy density drops faster for a radiation-filled Universe than a matter-filled one, and therefore so does the expansion rate.
What is the primary evidence for an accelerating universe?
True or False?: The primary evidence for an accelerating universe comes
form observations of young stars in the Milk Way
. False, in order to measure accelerating expansion, we need to measure the distances of objects billions of light-years away.
What evidence do astronomers have that the universe is expanding quizlet?
From what evidence do astronomers deduce that the Universe is expanding?
They see a redshift in the spectral lines of distant galaxies
.
What was it that causes the apparent expansion of the universe quizlet?
a repulsive force (opposite of gravity)
that causes the accelerated expansion of the universe. What evidence do we have for the existence of dark energy? accelerating.
How do we know the universe is expanding and still accelerating?
Observations show that the expansion of the universe is accelerating, such that the velocity at which a distant galaxy recedes from the observer is continuously increasing with
time
. … Confirmatory evidence has been found in baryon acoustic oscillations, and in analyses of the clustering of galaxies.
Is the Milky Way accelerating?
In a new study, researchers have now obtained the first direct measurement of the average acceleration taking place within our home galaxy, the Milky Way. It is well known that the
expansion of the universe is accelerating due to a mysterious dark energy
.
What exists in the universe?
The universe is everything. It
includes all of space, and all the matter and energy that space contains
. It even includes time itself and, of course, it includes you. Earth and the Moon are part of the universe, as are the other planets and their many dozens of moons.
Who discovered the universe is accelerating?
The 2011 Nobel Prize in physics was awarded today to
Saul Perlmutter
at the Lawrence Berkeley National Lab, Brian Schmidt at the Australian National Lab and Adam Reiss at Johns Hopkins University for their discovery of the accelerating expansion of the universe.
What is outside the universe?
The universe, being all there is, is infinitely big and has no edge, so
there’s no outside to
even talk about. … The current width of the observable universe is about 90 billion light-years. And presumably, beyond that boundary, there’s a bunch of other random stars and galaxies.
What is the most matter in the universe?
Put another way, this means the total amount of matter in the observable Universe is equivalent to 66 billion trillion times the mass of our Sun, Mohamed Abdullah, a University of California, Riverside astrophysicist and the paper’s lead author, told AFP. Most of this matter—80 percent—is called
dark matter
.
What do astronomers mean when they say the universe is expanding?
Answer. When scientists talk about the expanding universe, they mean that
it has been growing ever since its beginning with the Big Bang
. … In other words, the universe has no center; everything is moving away from everything else.
What do astronomers infer from the motion of the distant galaxies quizlet?
What do astronomers infer from the motion of the distant galaxies?
The Universe is expanding
. What evidence do astronomers have that the Universe is expanding? There is a measurable redshift in the spectral lines of distant galaxies.
What was the early universe like quizlet?
What were the conditions like in the early universe? The early universe was
filled with radiation and elementary particles
. It was so hot and dense that the energy of radiation could turn into particles of matter and antimatter, which then collided and turned back into radiation.
What evidence is there for and accelerating expansion quizlet?
The major evidence for the idea that the expansion of the universe is accelerating comes from observations of:
white dwarf supernovae
. Which of these possible types of universe would not expand forever? Spiral galaxy rotation curves are generally fairly flat out to large distances.
What happens when two spiral galaxies collide quizlet?
when two spiral galaxies collide they
form a elliptical galaxy
. a spiral galaxy alone is neat and orderly, when two orderly galaxies collide they form a messy tangled galaxy which is an elliptical galaxy.
