GE: Friday morning *Cosmology and general relativity: the evolution
... Visual and Causal Horizons Uncertainty Principles ...
... Visual and Causal Horizons Uncertainty Principles ...
Powerpoint for today
... even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
mass of star
... even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
Ch. 28 Test Topics
... -Know that the faster the source of light is moving the greater the shift of light. -Know that Edwin Hubble discovered that the farther away a galaxy was, the faster it was moving away from Earth. -Know the universe is continually expanding and how we know this. -Be able to describe the Big Bang the ...
... -Know that the faster the source of light is moving the greater the shift of light. -Know that Edwin Hubble discovered that the farther away a galaxy was, the faster it was moving away from Earth. -Know the universe is continually expanding and how we know this. -Be able to describe the Big Bang the ...
The Nature of Space and Time
... The Nature of Astronomy “Looking at the stars always makes me dreamas simply as I dream over the black dots representing towns and villages on a map. Why, I ask myself, shouldn’t the shining dots of the sky be as accessible as the black dots on the map of France?” Vincent Van Gogh ...
... The Nature of Astronomy “Looking at the stars always makes me dreamas simply as I dream over the black dots representing towns and villages on a map. Why, I ask myself, shouldn’t the shining dots of the sky be as accessible as the black dots on the map of France?” Vincent Van Gogh ...
Cosmology
... Describe and explain asteroids and meteorites and that these usually vaporize on entering the Earth’s atmosphere. Binary stars- most stars are part of a binary system and rotate around their common centre of mass. The Big Bang Discuss cosmic background radiation and its discovery. Talk about the sig ...
... Describe and explain asteroids and meteorites and that these usually vaporize on entering the Earth’s atmosphere. Binary stars- most stars are part of a binary system and rotate around their common centre of mass. The Big Bang Discuss cosmic background radiation and its discovery. Talk about the sig ...
Chapter 7 Review Answers
... 11.When the universe cooled and the wavelengths lengthened, scientists wondered where that extra energy created by the hot, short wavelengths at the beginning of the universe (BBT) went. That extra radiation should be present throughout the universe if the BBT was to be true. We believe now that th ...
... 11.When the universe cooled and the wavelengths lengthened, scientists wondered where that extra energy created by the hot, short wavelengths at the beginning of the universe (BBT) went. That extra radiation should be present throughout the universe if the BBT was to be true. We believe now that th ...
Historical overview
... radiation left over from this epoch follows a black-body distribution whose effective temperature drops as the universe expands. George Gamow predicted in 1953 that at present this radiation that fills the whole Universe has reached a temperature of 7K (see also work of Ralph Alpher and Robert Herma ...
... radiation left over from this epoch follows a black-body distribution whose effective temperature drops as the universe expands. George Gamow predicted in 1953 that at present this radiation that fills the whole Universe has reached a temperature of 7K (see also work of Ralph Alpher and Robert Herma ...
April 2006 - Otterbein University
... Conclusions from our Observations • The Universe has a finite age, so light from very distant galaxies has not had time to reach us, therefore the night sky is dark. ...
... Conclusions from our Observations • The Universe has a finite age, so light from very distant galaxies has not had time to reach us, therefore the night sky is dark. ...
Our Universe
... Nebulas are clouds of gas and dust in space. Gravity pulls the gas and dust particles closer and closer together until conditions are right for nuclear fusion to begin ...
... Nebulas are clouds of gas and dust in space. Gravity pulls the gas and dust particles closer and closer together until conditions are right for nuclear fusion to begin ...
Problem Set # 7: The Penultimate Problem Set Due Wednesday
... eyes is rsun = 17 pc. The luminosity of a supernova (that is, an exploding star) is Lsuper = 3.6×109 Lsun . What is the maximum distance rsuper at which you would be able to see a supernova with your naked eyes? If a supernova went off in the Andromeda Galaxy, would we be able to see it here on Eart ...
... eyes is rsun = 17 pc. The luminosity of a supernova (that is, an exploding star) is Lsuper = 3.6×109 Lsun . What is the maximum distance rsuper at which you would be able to see a supernova with your naked eyes? If a supernova went off in the Andromeda Galaxy, would we be able to see it here on Eart ...
Origins of the Universe - Fraser Heights Chess Club
... • Universe was actually expanding more slowly than it is today. So the expansion of the Universe has not been slowing due to gravity, as everyone thought, it has been accelerating. No one expected this, no one knew how to explain it. But something was causing it. ...
... • Universe was actually expanding more slowly than it is today. So the expansion of the Universe has not been slowing due to gravity, as everyone thought, it has been accelerating. No one expected this, no one knew how to explain it. But something was causing it. ...
Document
... Conclusions from our Observations • The Universe has a finite age, so light from very distant galaxies has not had time to reach us, therefore the night sky is dark. ...
... Conclusions from our Observations • The Universe has a finite age, so light from very distant galaxies has not had time to reach us, therefore the night sky is dark. ...
Bellringer - Madison County Schools
... As the particles rotate around the protostar, they flatten out (like pizza dough) into a disc shape that is called ...
... As the particles rotate around the protostar, they flatten out (like pizza dough) into a disc shape that is called ...
Expanding Universe
... 17 years later, Edwin Hubble showed that the Universe was in fact expanding, and Einstein called the cosmological constant his “biggest blunder”. ...
... 17 years later, Edwin Hubble showed that the Universe was in fact expanding, and Einstein called the cosmological constant his “biggest blunder”. ...
The Big Bang Theory
... to be) an expansion – Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe ...
... to be) an expansion – Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe ...
The Big Bang Theory
... to be) an expansion – Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe ...
... to be) an expansion – Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe ...
Document
... c) C.O.B.E satellite confirmed for the entire universe that noise radiation (static) is evenly spread d) Law of conservation of energy: energy can neither be created or destroyed – energy remains constant over time ...
... c) C.O.B.E satellite confirmed for the entire universe that noise radiation (static) is evenly spread d) Law of conservation of energy: energy can neither be created or destroyed – energy remains constant over time ...
Is space created and destroyed? 9 Feb 16 Feb 2012
... Lower plot: difference between m - M and a model with W0 = 0.2 for pressureless matter. Other models: W0,matter = 1, W0,L = 0 (L stands for cosmological constant or vacuum) W0,matter = 0.24, W0,L = 0.76 Supernovae are fainter than that for a universe with 0.2 of the critical density. Recall: to put ...
... Lower plot: difference between m - M and a model with W0 = 0.2 for pressureless matter. Other models: W0,matter = 1, W0,L = 0 (L stands for cosmological constant or vacuum) W0,matter = 0.24, W0,L = 0.76 Supernovae are fainter than that for a universe with 0.2 of the critical density. Recall: to put ...
Lecture 1
... Cosmology is the study of the universe taken as a whole ⇒ ruthless simplification necessary (e.g. homogeneity)! Cosmology describes the past, the present, and predicts the future of the universe. Cosmology deals with very large masses and length scales, thus, cosmologists use units of megaparsecs (M ...
... Cosmology is the study of the universe taken as a whole ⇒ ruthless simplification necessary (e.g. homogeneity)! Cosmology describes the past, the present, and predicts the future of the universe. Cosmology deals with very large masses and length scales, thus, cosmologists use units of megaparsecs (M ...
Redshift takes us from 2-D to 3-D
... But then the past shouldn’t look different than the present (on average) 3) The Universe was hot and opaque in the distant past. This is proven by the thermal cosmic background radiation. Only if all space were opaque would all space be filled with thermal photons (and their current temperature is r ...
... But then the past shouldn’t look different than the present (on average) 3) The Universe was hot and opaque in the distant past. This is proven by the thermal cosmic background radiation. Only if all space were opaque would all space be filled with thermal photons (and their current temperature is r ...
Shape of the universe
The shape of the universe is the local and global geometry of the Universe, in terms of both curvature and topology (though, strictly speaking, the concept goes beyond both). The shape of the universe is related to general relativity which describes how spacetime is curved and bent by mass and energy.There is a distinction between the observable universe and the global universe. The observable universe consists of the part of the universe that can, in principle, be observed due to the finite speed of light and the age of the universe. The observable universe is understood as a sphere around the Earth extending 93 billion light years (8.8 *1026 meters) and would be similar at any observing point (assuming the universe is indeed isotropic, as it appears to be from our vantage point).According to the book Our Mathematical Universe, the shape of the global universe can be explained with three categories: Finite or infinite Flat (no curvature), open (negative curvature) or closed (positive curvature) Connectivity, how the universe is put together, i.e., simply connected space or multiply connected.There are certain logical connections among these properties. For example, a universe with positive curvature is necessarily finite. Although it is usually assumed in the literature that a flat or negatively curved universe is infinite, this need not be the case if the topology is not the trivial one.The exact shape is still a matter of debate in physical cosmology, but experimental data from various, independent sources (WMAP, BOOMERanG and Planck for example) confirm that the observable universe is flat with only a 0.4% margin of error. Theorists have been trying to construct a formal mathematical model of the shape of the universe. In formal terms, this is a 3-manifold model corresponding to the spatial section (in comoving coordinates) of the 4-dimensional space-time of the universe. The model most theorists currently use is the so-called Friedmann–Lemaître–Robertson–Walker (FLRW) model. Arguments have been put forward that the observational data best fit with the conclusion that the shape of the global universe is infinite and flat, but the data are also consistent with other possible shapes, such as the so-called Poincaré dodecahedral space and the Picard horn.