Whittle;
Cosmology, History and Nature of Our Universe |
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Lecture |
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Topic |
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Whittle; Cosmology |
2 |
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Hubble Deep Field, a small patch
of sky started studying by the Hubble space telescope in 1995. 3000 galaxies
some of which are 12 billion light years away. |
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Whittle; Cosmology |
2 |
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living things are enormously
more complex than astronomical objects. |
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Whittle; Cosmology |
2 |
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if things shown in proportion to
their complexes the, Galaxie is whether the dim light bulbs, but your brain
would be a beacon visible across the whole universe. |
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Whittle; Cosmology |
3 |
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the universe is isotropic. |
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Whittle; Cosmology |
3 |
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radio Galaxie is several billion
light years away are distributed very uniformly. |
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Whittle; Cosmology |
3 |
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the microwave background is
incredibly uniform, varied by less than 0.01% from place to place. |
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Whittle; Cosmology |
3 |
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the universe is homogeneous on
larger scales. |
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Whittle; Cosmology |
3 |
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the universe as the neural
quality:: smooth on scales above 200 million light years and love the scale
below. |
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Whittle;
Cosmology |
3 |
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the cosmological principle
states that the universe looks the same statistically from all locations –
burst of this simply means averaging over large enough volume. |
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Whittle; Cosmology |
3 |
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the cosmological principle
implies that the universe has no center or edge. |
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Whittle; Cosmology |
3 |
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in the 1950s, seeing galaxies
sufficiently distant was very difficult. |
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Whittle;
Cosmology |
3 |
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my the mid-1960s, the data gave
clear results that there were more faint radio galaxies that expected for
uniform density, suggesting there were more radio galaxies in earlier times. |
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Whittle; Cosmology |
3 |
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moderate deep surveys show that
quasars were more common in the past. |
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Whittle; Cosmology |
3 |
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cosmic expansion has changed
over time. Distant galaxies appear some systematically younger than nearby
ones. Galaxies were less clustered in the past, and the million-year-old
universe had no stars and galaxies but was just a hot, then, glowing gas. |
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Whittle; Cosmology |
3 |
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the universe clearly
"evolves" |
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Whittle; Cosmology |
4 |
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This Stuff of the Universe |
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Whittle; Cosmology |
4 |
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five fundamental cosmic
constituents: atomic matter, white, neutrinos, Darden, and dark energy. |
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Whittle; Cosmology |
4 |
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absolute zero temperature:
-459°F, -273°C, 0 K (Kelvin) |
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Whittle; Cosmology |
4 |
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neutrinos will will matter at
all. |
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Whittle; Cosmology |
4 |
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the Big Bang made huge numbers
of neutrinos, about as many as photons. |
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Whittle; Cosmology |
4 |
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neutrinos play an important role
in the first second of the universe. |
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Whittle; Cosmology |
4 |
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we know that dark matter exists
because the gravitational effects. |
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Whittle; Cosmology |
4 |
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Dark matter forms giant Sears
(called payloads) around galaxies that provide the framework into which
atomic matter can fall to make the galaxies. |
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Whittle; Cosmology |
4 |
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dark matter remains spread out,
so it's density at any given location is very low. |
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Whittle; Cosmology |
4 |
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Overall, dark
matter outweighs atomic
matter of 6 to 1, making up 23% of the total. |
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Whittle; Cosmology |
4 |
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Dark energy was the most recent cosmic constituent to be discovered, in 1998. |
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Whittle; Cosmology |
4 |
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The existence of dark energy is revealed by its gravitational effect. |
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Whittle; Cosmology |
4 |
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Dark energy makes the universe's expansion speed up. |
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Whittle;
Cosmology |
4 |
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The exact nature of dark energy is still unknown, but our best guess is that
it's a tiny residual energy associated with space itself. For this reason it is sometimes called a "vacuum
energy" |
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Whittle; Cosmology |
4 |
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Despite the dark
energy is low density, it ultimately comprises about 73%
of the total. |
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Whittle; Cosmology |
4 |
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Overall, the universe was denser in the past. |
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Whittle; Cosmology |
4 |
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Matter thins
out with cosmic
expansion, while dark
energy does not (it is a property
of space). |
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Whittle;
Cosmology |
4 |
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The relative amount of the five constituents changes, leading
to three great eras: the radiation, matter, and dark
energy eras where the name gives
the dominant constituent
during that era. |
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Whittle; Cosmology |
4 |
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all five component of the
different forms of a single entity: mass-energy. |
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Whittle;
Cosmology |
4 |
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Because c2 is so big, you can think of matter as extremely concentrated energy. |
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Whittle; Cosmology |
4 |
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a crucial point about is the mass or energy is that they generate gravity,
whose energy is make it. |
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Whittle; Cosmology |
4 |
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amazingly, the total energy of
the universe arms to zero. |
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Whittle;
Cosmology |
4 |
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Inflation provides a mechanism to split
nothing in the huge
amounts of positive mass energy held together by an equal amount of negative gravitational energy. |
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Whittle; Cosmology |
5 |
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Universe is about 13.7 billion years old. |
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Whittle; Cosmology |
5 |
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Change occurs very rapidly at the beginning. |
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Whittle; Cosmology |
5 |
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Big Bang's expansion is launched by a mechanism called "inflation" |
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Whittle; Cosmology |
5 |
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Inflation starts with BC region containing a
special kind of dense vacuum. |
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Whittle; Cosmology |
5 |
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a Wednesdays in itself makes
gravity, the region naturally falls out, expanding all by itself. |
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Whittle; Cosmology |
5 |
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A huge
region of expanding
dense vacuum is generated. |
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Whittle;
Cosmology |
5 |
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When inflation ends, the vacuum energy is transformed to an immensely hot broth of every kind of subatomic particles. Our universe has now been launched. |
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Whittle; Cosmology |
5 |
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Several
things happen in the first
millisecond. |
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Whittle; Cosmology |
5 |
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the forces of nature – strong,
electromagnetic, week, and gravity – take on their current forms. |
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Whittle; Cosmology |
5 |
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the character of these forces
depends on temperature, and in the early universe it is thought that they
were joined as a single force. |
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Whittle;
Cosmology |
5 |
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as a universal cold, they each
took on their own identity, with the final separation of the weak and
electromagnetic forces occurring near a 10th of a nanosecond. |
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Whittle; Cosmology |
5 |
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the first millisecond also saw
the creation of matter. |
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Whittle; Cosmology |
5 |
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initially, universal is filled
with an incredibly hot, dense gas of quarks, protons, electrons, and
neutrinos. |
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Whittle; Cosmology |
5 |
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near 10 µs, it was cool enough
for two combined to make protons, and I broke kinds, neutrons, and anti-new
dream and and I neutrons. |
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Whittle; Cosmology |
5 |
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near 100 µs, the protons and
antiprotons, and the neutrinos and anti-neutrinos, almost all annihilated. |
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Whittle; Cosmology |
5 |
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fortunately, a one in a bid in
excess of protons over antiprotons left in matter from which you and I are
now made. |
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Whittle; Cosmology |
5 |
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at a few seconds, electrons and
anti-electrons and mildly, leading protons as the dominant constituent of the
universe. |
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Whittle; Cosmology |
5 |
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although the first second seemed
very short to us, it is an immense track of time to nature, which functions
amazingly fast. |
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Whittle;
Cosmology |
5 |
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when the universe in about one
minute old, the conditions everywhere was similar to those at the center
centers of present-day stars – right for hydrogen fusion. |
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Whittle; Cosmology |
5 |
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between one in three minutes, a
quarter of the conflict hydrogen was converted into helium. |
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Whittle; Cosmology |
5 |
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around 60,000 years, light and
matter are roughly equal densities. |
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Whittle; Cosmology |
5 |
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lights density drops faster than
matters, so we passed from the radiation error to the matter era at the
60,000 year time |
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Whittle; Cosmology |
5 |
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at the 60,000 year transition
the gravity of radiation and matter pullback, slowing the expansion speed |
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Whittle; Cosmology |
5 |
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.at 400,000 years, universe
colds past 3000 Callan, below which electrons remain attached to protons, and
atoms finally form. |
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Whittle;
Cosmology |
5 |
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we witnessed this transition as
the microwave background – the light ways from the hot, glowing gas are
stretched by cosmic expansion and arrive as microwaves. |
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Whittle; Cosmology |
5 |
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an important feature of the
microwave background is a slight hatchets, which reveals a slight lumpiness
that ultimately grows the form galaxies. |
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Whittle; Cosmology |
5 |
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the lump sum primarily of dark
matter, but the glowing atomic guest bounces in and out of the regions,
making sound ways, which we see as prejudice. |
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Whittle; Cosmology |
5 |
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scientists listen to this prime
primordial sound and learn how and cosmology of cosmologists use it to
measure many properties of the universe. |
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Whittle; Cosmology |
5 |
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the expansion of slightly denser
regions is a little slower than average, so that over time the lumpiness
grows. |
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Whittle; Cosmology |
5 |
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after about 100 million years,
the densest regions all their expansion and began collapsing. |
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Whittle; Cosmology |
5 |
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by about 200 million years, all
across the universe, pockets of dark and atomic matter collapse, and it's in
the center is that the first stars are born. |
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Whittle; Cosmology |
5 |
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these first stars are huge, Ms.
Short lives, and Diane supernova explosions. |
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Whittle; Cosmology |
5 |
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the supernova explosions
released newly made chemical elements. |
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Whittle; Cosmology |
5 |
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from generation to generation,
stars continue to enrich their surroundings with heavy elements. |
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Whittle; Cosmology |
5 |
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by about 1 billion years, the
first infant galaxies have formed. |
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Whittle; Cosmology |
5 |
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this. Involves frequent galaxy
collisions, prodigious starboard, and supernova explosions. |
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Whittle; Cosmology |
5 |
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these first infant galaxies are
currently the most distant objects visible with the days biggest telescopes. |
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Whittle; Cosmology |
5 |
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about 5 billion years ago,
galaxies began to mature into the kind we see around us today. |
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Whittle; Cosmology |
5 |
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the sun and solar system form in
the disk of a young Milky Way galaxy. |
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Whittle; Cosmology |
5 |
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the galaxy with gets more
defined, as galaxies flow into and then down to the filaments, forming
galaxies cluster where they intersect. |
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Whittle; Cosmology |
5 |
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the universe's expansion chains
is from slowing down to speeding up as the effects of dark energy began to be
felt. |
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Whittle; Cosmology |
5 |
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looking into the future – as the
billions of years past – we're again for an ever lonely universe. |
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Whittle; Cosmology |
5 |
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Alex is continually get farther
away, moving faster. |
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Whittle; Cosmology |
5 |
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as they pass lightspeed, they
become forever invisible to us crossing an event horizon" |
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Whittle; Cosmology |
5 |
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around 100 billion years from
now only all local ball of stars will be visible, formed by the merger of the
Milky Way and if you neighbor galaxies. |
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Whittle;
Cosmology |
5 |
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viewed optimistically, we're
lucky to live relatively early in the life of the universe, when a rich
cosmic history is still visible to us and cosmology is still a viable
subject. |
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Whittle; Cosmology |
5 |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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Whittle; Cosmology |
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