hw 36
When we speak of time dilation, we mean that time
stretches with speed.
Relativity is the
study of how space, energy, and mass are related to time.
Dark Matter is matter that
cannot be seen or felt, but can be measured through its gravitational effects.
It currently appears that within this universe we have mostly
dark energy.
Evidence for dark matter is exhibited by the
degree to which galaxy clusters exhibit gravitational lensing effects;speed at which galaxies orbit one another within clusters.;relatively similar speeds at which all stars in a galaxy orbit the galactic nucleus (all the above)
According to Einstein, gravity is not the force exerted by one object on another, but rather the
effect we witness when a large mass causes a curvature in the shape of spacetime.
Edwin Hubble discovered that the farther away a galaxy is the
faster it is receding from us
The modern theory of dark energy arises from observations showing that
galaxies are accelerating away from each other
The universe as a whole is
has yet to be determined, although most astrophysical data points to a flat universe
Dark energy bends the curvature of spacetime
in the opposite manner of gravity.
Einstein theories tell us that the speed of light
is constant in all frames of reference.
The Big Bang
marked the beginning of space and time.
Spacetime is curved by
mass
In a flat universe parallel lines
never converge
Where is dark matter found in the periodic table
no where at all
According to dark matter theory, most of the mass of a spiral galaxy is found
outside of the luminescent spiral arms.
The "Big Bang" refers to the
point in time in which the known (and perhaps knowable) universe came into being.
Heat death refers to the universe
reaching the lowest energy state possible, which will mean the greatest level of entropy
Eternal Inflation refers to
the possibility that our universe is only a patch of a greater universe and that the process of universe spawning will continue forever
In his special theory of relativity, Einstein stated that the laws of physics are
the same in all uniformly moving frames of reference
According to inflation theory, parallel lines appear to remain parallel because
the universe is so unbelievably large.
The theory of dark energy tells us that
there is still much to learn about this universe;empty space is seething with a form of energy;there is a force that behaves like an anti-gravity
The currently accepted reasoning for why the cosmic background radiation is so uniform in temperature is because
this temperature uniformity was achieved in the moments before cosmic inflation.
Dark energy
would be considered to be the opposite of gravity;is energy that exerts an outward pressure, causing spacetime to expand;is the phenomenon responsible for the acceleration of the universe
If you travel at high speed, then compared with your friends who "stay at home," you are
younger.
Cosmology is the study of the overall structure and evolution of
- universe
How is it possible that today's diverse universe was able to arise from that which was very homogeneous at its first moments
Inflation magnified ultrasmall quantum variations in position and momenta
If the Sun suddenly became less massive, what would happen to Earth's orbit
Spacetime around the Sun would become flatter, and the Earth, with its current momentum, would exit its orbit around the Sun.
If heat death results in a maximum amount of entropy, then what does this say about entropy at the beginning of the universe
The Big Bang was a moment of minimal entropy
Distant galaxies are
accelerating away from each other.
he Big Rip refers to the
accelerating influence of dark energy, causing all matter to become completely ripped apart.
Cosmic Inflation refers to
an extremely rapid expansion of the early universe that occurred in an extremely brief period of time.
What Einstein discovered about space and time is that they
are parts of one whole.
If dark matter were to be found on this planet it would likely be
at the center of Earth's core.
The Big Bang occurred
at the tip of your nose