Anthropic Arguments
... Read the following passage and then answer the questions at the end. The biggest telescopes can see objects about 12-14 billion light years away. This means that the light has been traveling to us for 12-14 billion years. Clearly, then, the universe must be at least this old. While this is an incred ...
... Read the following passage and then answer the questions at the end. The biggest telescopes can see objects about 12-14 billion light years away. This means that the light has been traveling to us for 12-14 billion years. Clearly, then, the universe must be at least this old. While this is an incred ...
News Release - האוניברסיטה העברית
... Universe billions of years ago has been formulated by Hebrew University of Jerusalem cosmologists. The theory takes issue with the prevailing view on how the galaxies came to exist. The new theory, motivated by advanced astronomical observations and based on state-of-the-art computer simulations, ma ...
... Universe billions of years ago has been formulated by Hebrew University of Jerusalem cosmologists. The theory takes issue with the prevailing view on how the galaxies came to exist. The new theory, motivated by advanced astronomical observations and based on state-of-the-art computer simulations, ma ...
Beyond the Big Bang - Physics Department, Princeton University
... The chosen patch of the sky was a speck, roughly the size of Franklin D. Roosevelt’s eye on a dime if you hold the coin out at arm’s length. The patch appears blank to the human eye and to ground-based telescopes because it contains no stars or galaxies bright enough to be seen. But by adding up th ...
... The chosen patch of the sky was a speck, roughly the size of Franklin D. Roosevelt’s eye on a dime if you hold the coin out at arm’s length. The patch appears blank to the human eye and to ground-based telescopes because it contains no stars or galaxies bright enough to be seen. But by adding up th ...
Earth and Space - Kennesaw State University College of Science
... Proposed sequence of the “big bang” – The universe begins as a singularity (point) – In the first 10-34 sec, the universe “inflates” (expands) and is very “hot,” so energy & matter are indistinguishable (“quark soup”) – By 1 sec, the universe has expanded and cooled to the point that stable proton ...
... Proposed sequence of the “big bang” – The universe begins as a singularity (point) – In the first 10-34 sec, the universe “inflates” (expands) and is very “hot,” so energy & matter are indistinguishable (“quark soup”) – By 1 sec, the universe has expanded and cooled to the point that stable proton ...
About the Infinite Repetition of Histories in Space - Philsci
... books, even those made of meaningless character strings. Every book contains exactly 1.312.000 characters. For every particular book, the library contains over thirty million almost identical copies which differ in just one character, which can be considered as copies with a single erratum; almost o ...
... books, even those made of meaningless character strings. Every book contains exactly 1.312.000 characters. For every particular book, the library contains over thirty million almost identical copies which differ in just one character, which can be considered as copies with a single erratum; almost o ...
Gresham Lecture, Wednesday 15 December 2010 Unsolved
... There is a, now famous, quotation from the American Secretary of Defence, Donald Rumsfeld, in which he says (put in a slightly clearer way): There are known "knowns." These are things we know that we know. There are also known unknowns - that is to say there are things that we now know we don't know ...
... There is a, now famous, quotation from the American Secretary of Defence, Donald Rumsfeld, in which he says (put in a slightly clearer way): There are known "knowns." These are things we know that we know. There are also known unknowns - that is to say there are things that we now know we don't know ...
This document was created for people who do not have access to
... Slide credit: R. Kirshner, CfA ...
... Slide credit: R. Kirshner, CfA ...
Introduction to the Axiomatic Method
... “demonstrate”. I thought at first that I understood its meaning, but soon became satisfied that I did not. I said to myself, What do I do when I demonstrate more than when I reason or prove? How does demonstration differ from any other proof? I consulted Webster’s Dictionary. They told of ‘certain p ...
... “demonstrate”. I thought at first that I understood its meaning, but soon became satisfied that I did not. I said to myself, What do I do when I demonstrate more than when I reason or prove? How does demonstration differ from any other proof? I consulted Webster’s Dictionary. They told of ‘certain p ...
Lecture 5
... Hubble-Humason constant of 500 km/s/Mpc, which is much higher than the currently accepted value due to errors in their distance calibrations. In 1929 Hubble and Humason formulated the empirical Redshift Distance Law of galaxies, nowadays termed simply Hubble's law, which, if the redshift is interpre ...
... Hubble-Humason constant of 500 km/s/Mpc, which is much higher than the currently accepted value due to errors in their distance calibrations. In 1929 Hubble and Humason formulated the empirical Redshift Distance Law of galaxies, nowadays termed simply Hubble's law, which, if the redshift is interpre ...
Slide 1
... Hubble-Humason constant of 500 km/s/Mpc, which is much higher than the currently accepted value due to errors in their distance calibrations. In 1929 Hubble and Humason formulated the empirical Redshift Distance Law of galaxies, nowadays termed simply Hubble's law, which, if the redshift is interpre ...
... Hubble-Humason constant of 500 km/s/Mpc, which is much higher than the currently accepted value due to errors in their distance calibrations. In 1929 Hubble and Humason formulated the empirical Redshift Distance Law of galaxies, nowadays termed simply Hubble's law, which, if the redshift is interpre ...
Euclid`s Postulates
... Euclid's Postulates: Postulate or axiom is a statement is taken to be true without proof. Euclid was a Greek mathematician (about 325 BC – 265 BC). http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Euclid.html ...
... Euclid's Postulates: Postulate or axiom is a statement is taken to be true without proof. Euclid was a Greek mathematician (about 325 BC – 265 BC). http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Euclid.html ...
Astronomy (stars, galaxies and the Universe)
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
The Story of Flatland: An Adventure in Many Dimensions Adapted
... Sum of angles of a triangle in spherical geometry is greater than 180○ and less than or equal to 270○ Larger the triangle (up to quadrant of sphere), larger the sum of angles is Concepts of perfection and imperfection, and measurement error ...
... Sum of angles of a triangle in spherical geometry is greater than 180○ and less than or equal to 270○ Larger the triangle (up to quadrant of sphere), larger the sum of angles is Concepts of perfection and imperfection, and measurement error ...
Astronomy (stars, galaxies and the Universe)
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
Slide 1
... b) There is an observed increase in the wavelength of light from most distant galaxies. The further away the galaxies are, the faster they are moving, and the bigger the observed increase in wavelength. This effect is called red-shift. c) How the observed red-shift provides evidence that the univers ...
... b) There is an observed increase in the wavelength of light from most distant galaxies. The further away the galaxies are, the faster they are moving, and the bigger the observed increase in wavelength. This effect is called red-shift. c) How the observed red-shift provides evidence that the univers ...
equiangular polygon
... A polygon is equiangular if all of its interior angles are congruent. Common examples of equiangular polygons are rectangles and regular polygons such as equilateral triangles and squares. Let T be a triangle in Euclidean geometry, hyperbolic geometry, or spherical geometry. Then the following are e ...
... A polygon is equiangular if all of its interior angles are congruent. Common examples of equiangular polygons are rectangles and regular polygons such as equilateral triangles and squares. Let T be a triangle in Euclidean geometry, hyperbolic geometry, or spherical geometry. Then the following are e ...
Lecture 1a
... • How can we know what the universe was like in the past? • Light takes time to travel through space (the speed of light = c = 300,000 km/s). Thus, when we look farther away, we see light that has taken a longer time to reach us. ...
... • How can we know what the universe was like in the past? • Light takes time to travel through space (the speed of light = c = 300,000 km/s). Thus, when we look farther away, we see light that has taken a longer time to reach us. ...
Emina
... They are conventions. Our choice among all possible conventions is guided by experimental facts; but it remains free, and is only limited by necessity of avoiding every contradiction… What then are we to think of the question: Is Euclidean geometry true? It has no meaning. We might as well ask if th ...
... They are conventions. Our choice among all possible conventions is guided by experimental facts; but it remains free, and is only limited by necessity of avoiding every contradiction… What then are we to think of the question: Is Euclidean geometry true? It has no meaning. We might as well ask if th ...
Chapter 30 Review
... 1. The greater the distance to a galaxy, the greater its velocity. 2. The greater the distance to a galaxy, the brighter its halo. 3. The greater the distance to a galaxy, the greater its age. 4. The greater the distance to a galaxy, the greater its mass. ...
... 1. The greater the distance to a galaxy, the greater its velocity. 2. The greater the distance to a galaxy, the brighter its halo. 3. The greater the distance to a galaxy, the greater its age. 4. The greater the distance to a galaxy, the greater its mass. ...
Document
... If the Universe is now expanding, then… At an earlier time, it must have been smaller and denser… The further back you go, the smaller and denser the Universe must have been… There must have been a beginning in which the entire Universe was contained within an infinitely small space: ...
... If the Universe is now expanding, then… At an earlier time, it must have been smaller and denser… The further back you go, the smaller and denser the Universe must have been… There must have been a beginning in which the entire Universe was contained within an infinitely small space: ...
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.