Word version of Episode 705
... What does the constant mean? Hubble’s realised that the light from distant galaxies is red-shifted and that the more distant they are, the greater the red shift. Today, this is interpreted to mean that the Universe is expanding: that is, the space between clusters of galaxies is expanding and theref ...
... What does the constant mean? Hubble’s realised that the light from distant galaxies is red-shifted and that the more distant they are, the greater the red shift. Today, this is interpreted to mean that the Universe is expanding: that is, the space between clusters of galaxies is expanding and theref ...
Episode 705: Cosmology - Teaching Advanced Physics
... What does the constant mean? Hubble’s realised that the light from distant galaxies is red-shifted and that the more distant they are, the greater the red shift. Today, this is interpreted to mean that the Universe is expanding: that is, the space between clusters of galaxies is expanding and theref ...
... What does the constant mean? Hubble’s realised that the light from distant galaxies is red-shifted and that the more distant they are, the greater the red shift. Today, this is interpreted to mean that the Universe is expanding: that is, the space between clusters of galaxies is expanding and theref ...
Passport to the Universe Educator`s Guide Text
... of their matter to energy, then ultimately die. The most massive stars live short, energetic lives and burst apart in great explosions, while others experience a more moderate life and death. The Sun, born in a cloud like the Orion Nebula almost 5 billion years ago, will live another 5 billion years ...
... of their matter to energy, then ultimately die. The most massive stars live short, energetic lives and burst apart in great explosions, while others experience a more moderate life and death. The Sun, born in a cloud like the Orion Nebula almost 5 billion years ago, will live another 5 billion years ...
Word
... scales in the galaxy distribution and with the expected change of with length scale (e.g. eqn 8.4). 8.3 The formation of galaxies The formation of galaxies is thought to have been the result of similar density fluctuations to those in the previous section, produced in the early Universe but on muc ...
... scales in the galaxy distribution and with the expected change of with length scale (e.g. eqn 8.4). 8.3 The formation of galaxies The formation of galaxies is thought to have been the result of similar density fluctuations to those in the previous section, produced in the early Universe but on muc ...
PowerPoint Presentation - Inflation, String Theory
... solves many problems of the old Big Bang theory, and explains how the universe could be created from less than one milligram of matter ...
... solves many problems of the old Big Bang theory, and explains how the universe could be created from less than one milligram of matter ...
eXtremely Fast Tr
... away from us at a velocity approaching the speed of light. This has the effect of further diminishing the intensity of their light, as ...
... away from us at a velocity approaching the speed of light. This has the effect of further diminishing the intensity of their light, as ...
1 Introduction for non-astronomers 1.1 Our expanding universe
... (which includes stars, dust, and everything else that we can see around us) was being helped in this task by an additional component of invisible “dark matter”. Although dark matter seems to have the same gravitational attraction as baryonic matter, it does not emit light, at any wavelength. This ma ...
... (which includes stars, dust, and everything else that we can see around us) was being helped in this task by an additional component of invisible “dark matter”. Although dark matter seems to have the same gravitational attraction as baryonic matter, it does not emit light, at any wavelength. This ma ...
Our Universe—Infinite and Eternal: Its Physics
... the nitty gritty of a topic might find a first reading difficult. However, the first reading should give the reader the essentials of the needed background so that a second reading should proceed more easily and give a fuller understanding of what is being presented. The only topic so far in this part of ...
... the nitty gritty of a topic might find a first reading difficult. However, the first reading should give the reader the essentials of the needed background so that a second reading should proceed more easily and give a fuller understanding of what is being presented. The only topic so far in this part of ...
Clicker Questions!
... How do scientists tell the age of different rocks on Earth? A. They look at the layering of rocks, which is similar in many places on Earth. Lower layers were formed first, upper layers afterward. B. They look at the density of rocks. Density gradually increases as Earth ages. C. Some elements gradu ...
... How do scientists tell the age of different rocks on Earth? A. They look at the layering of rocks, which is similar in many places on Earth. Lower layers were formed first, upper layers afterward. B. They look at the density of rocks. Density gradually increases as Earth ages. C. Some elements gradu ...
Great Discoveries in Astronomy and Astrophysics 171.112
... How did we come to know what we know about the Universe? This course will focus on key discoveries in astronomy and astrophysics from the speed of light to the speed of the expanding and now accelerating Universe, from the discovery of Neptune to the modern detection of extrasolar planets, spanning ...
... How did we come to know what we know about the Universe? This course will focus on key discoveries in astronomy and astrophysics from the speed of light to the speed of the expanding and now accelerating Universe, from the discovery of Neptune to the modern detection of extrasolar planets, spanning ...
Outline 8: History of the Universe and Solar System
... • Is the Universe 20 BY old? • No, gravitational forces have slowed down the galaxies since the Big Bang. • (Note: Recent observations suggest this was the case for the first 2/3 of the Universe’s history. The expansion rate now seems to have increased for the last 1/3 of the Universe’s history. Thi ...
... • Is the Universe 20 BY old? • No, gravitational forces have slowed down the galaxies since the Big Bang. • (Note: Recent observations suggest this was the case for the first 2/3 of the Universe’s history. The expansion rate now seems to have increased for the last 1/3 of the Universe’s history. Thi ...
The Hubble Space Telescope - the first 10 years
... • Aim, to measure the expansion rate of the Universe => the age of the universe! • To do this we need a very accurate distance measurement, the velocity we already know • But how do we measure distances ? • Well some stars are known to pulsate at a rate which depends on their brightness. • We can us ...
... • Aim, to measure the expansion rate of the Universe => the age of the universe! • To do this we need a very accurate distance measurement, the velocity we already know • But how do we measure distances ? • Well some stars are known to pulsate at a rate which depends on their brightness. • We can us ...
1. Put these objects in the correct order, from nearest
... Yes, the universe does not gain or lose mass or energy. Yes, although the universe continues to expand, what we can see the observable universe - stays the same size. C. No, we can see light from more distant parts of the universe today than we could have seen a few billion years ago. D. No, the obs ...
... Yes, the universe does not gain or lose mass or energy. Yes, although the universe continues to expand, what we can see the observable universe - stays the same size. C. No, we can see light from more distant parts of the universe today than we could have seen a few billion years ago. D. No, the obs ...
Classical Probability, Shakespearean Sonnets, and
... number of fractions between 0 and 1 while there are no more fractions between 2 and ∞ than between 0 and 1. Likewise, there are an infinite number of scenarios where an infinite number of values for i would not include all potential values for i. In the case of events with a 0 proportion, we can app ...
... number of fractions between 0 and 1 while there are no more fractions between 2 and ∞ than between 0 and 1. Likewise, there are an infinite number of scenarios where an infinite number of values for i would not include all potential values for i. In the case of events with a 0 proportion, we can app ...
Option D Lesson 6 Cosmology and Further - Physics
... between speed of galaxies and their distance from us implies that at an earlier point in time, everything in the Universe was much closer together. In fact, we can trace the universe backwards to a point in time (~13.7 billion years ago) when the Universe was compressed into a space smaller than t ...
... between speed of galaxies and their distance from us implies that at an earlier point in time, everything in the Universe was much closer together. In fact, we can trace the universe backwards to a point in time (~13.7 billion years ago) when the Universe was compressed into a space smaller than t ...
Lecture 39: Early Universe Test 3 overview 11/21
... processes “caused” the Universe to be what it is? Are other universes possible? Would they look like ours (have the same physics)? • Olber’s Paradox: sky dark at night Universe is finite in time and/or space • Cosmological Principle - the Universe appears the same from any location - Isotropic - n ...
... processes “caused” the Universe to be what it is? Are other universes possible? Would they look like ours (have the same physics)? • Olber’s Paradox: sky dark at night Universe is finite in time and/or space • Cosmological Principle - the Universe appears the same from any location - Isotropic - n ...
Document
... Do you need to learn all of characteristics on RTB’s fine-tuned list to communicate this? No. I have found three characteristics that eliminate all life in the Milky Way and universe, other than earth. 1) Life requires a very stable burning star (sun). To date astronomers have cataloged about 2,500, ...
... Do you need to learn all of characteristics on RTB’s fine-tuned list to communicate this? No. I have found three characteristics that eliminate all life in the Milky Way and universe, other than earth. 1) Life requires a very stable burning star (sun). To date astronomers have cataloged about 2,500, ...
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.