Word - Sam Davyson
... time elapsed since all galaxies in one place. reciprocal of the Hubble constant H0 This gives a way to find the age of the universe. However there are some problems. This assumes that the speed is constant for a galaxy. Due to gravity it isn’t which gives an over-estimate on the age of the unive ...
... time elapsed since all galaxies in one place. reciprocal of the Hubble constant H0 This gives a way to find the age of the universe. However there are some problems. This assumes that the speed is constant for a galaxy. Due to gravity it isn’t which gives an over-estimate on the age of the unive ...
origins of the Universe
... other words, it had no facts or evidence to back it up. But in the early 1900’s astronomers started to find evidence that pointed to a Big Bang. • In 1922, astronomer Edwin Hubble observed that the universe was expanding. The most distant galaxies he could see through his telescope were moving away ...
... other words, it had no facts or evidence to back it up. But in the early 1900’s astronomers started to find evidence that pointed to a Big Bang. • In 1922, astronomer Edwin Hubble observed that the universe was expanding. The most distant galaxies he could see through his telescope were moving away ...
The Nature of Space and Time
... evolution, and underlying physics and chemistry of celestial phenomena and the universe itself… ...
... evolution, and underlying physics and chemistry of celestial phenomena and the universe itself… ...
The Big Bang
... away from the earth appears to be shifted toward the red end. • This is called the red shift. • The more the spectrum of light is shifted toward the blue or red end of the spectrum, the faster the star is moving toward or away from the earth. ...
... away from the earth appears to be shifted toward the red end. • This is called the red shift. • The more the spectrum of light is shifted toward the blue or red end of the spectrum, the faster the star is moving toward or away from the earth. ...
1_Introduction
... t=0: The Big Bang Why do we care that this happened? If the universe had remained dense, it wouldn’t have cooled enough for nuclei, atoms, galaxies, and us to form. (Speaking to an audience of humans, I make no apologies for my human chauvinism.) ...
... t=0: The Big Bang Why do we care that this happened? If the universe had remained dense, it wouldn’t have cooled enough for nuclei, atoms, galaxies, and us to form. (Speaking to an audience of humans, I make no apologies for my human chauvinism.) ...
THE BIG BANG - Dublin City Schools
... more distant galaxies had higher redshifts (light takes millions or even billions of years to reach us from a distant galaxy) This means we are seeing an image from millions or billions of years ago. He noticed that the light, when it was emitted, would have shorter wavelengths. But, he observed lon ...
... more distant galaxies had higher redshifts (light takes millions or even billions of years to reach us from a distant galaxy) This means we are seeing an image from millions or billions of years ago. He noticed that the light, when it was emitted, would have shorter wavelengths. But, he observed lon ...
Where is the rest of the universe?
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
Our Place In the Universe
... Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. Because looking 15 billion lightyears away means looking to a time before the universe existed. ...
... Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. Because looking 15 billion lightyears away means looking to a time before the universe existed. ...
A105 Stars and Galaxies - Indiana University Astronomy
... • The Universe is expanding (and cooling) from an initial, dense state • Radiation left over from the Big Bang is now detected in the form of microwaves—the cosmic microwave background—which we can observe with a radio telescope • Observations of helium and other light elements agree with the predic ...
... • The Universe is expanding (and cooling) from an initial, dense state • Radiation left over from the Big Bang is now detected in the form of microwaves—the cosmic microwave background—which we can observe with a radio telescope • Observations of helium and other light elements agree with the predic ...
Astronomy and Cosmology Exam Review
... 1) One light year is about 9.5x1012 Km 2) What does the red shift tell us about the motion of the universe? It is expanding 3) What is currently the most accepted theory about the origin of the universe called? Big Bang 4) What can I tell about a star based on its color? What elements are present 5) ...
... 1) One light year is about 9.5x1012 Km 2) What does the red shift tell us about the motion of the universe? It is expanding 3) What is currently the most accepted theory about the origin of the universe called? Big Bang 4) What can I tell about a star based on its color? What elements are present 5) ...
Cosmology Prof. Yves Gaspar COURSE CONTENT Cosmology
... Cosmology corresponds to the part of physics that studies the origin and the evolution of the universe. In this field, various disciplines of physics, which are usually taught separately, are used in a unified framework. The course also contains a part dedicated to theoretical astrophysics, which st ...
... Cosmology corresponds to the part of physics that studies the origin and the evolution of the universe. In this field, various disciplines of physics, which are usually taught separately, are used in a unified framework. The course also contains a part dedicated to theoretical astrophysics, which st ...
SYLLABUS Spring 2012 SCIE 3304, SECTION 001 ASTRONOMY
... stars from birth to white dwarf, neutron stars, or black holes. Demonstrate the properties and evolution of our galaxy, other galaxies and the entire universe. Analyze the various methods used to measure distances out to the edges of the visible universe. Explain the experimental basis for the Big ...
... stars from birth to white dwarf, neutron stars, or black holes. Demonstrate the properties and evolution of our galaxy, other galaxies and the entire universe. Analyze the various methods used to measure distances out to the edges of the visible universe. Explain the experimental basis for the Big ...
gravity - in a secure place with other
... More mass = greater curvature (locally) Affects time (locally at curvature) E= mc2 means that photons have energy related mass and therefore follow the curvature: Need an Ant Universe to demonstrate: ...
... More mass = greater curvature (locally) Affects time (locally at curvature) E= mc2 means that photons have energy related mass and therefore follow the curvature: Need an Ant Universe to demonstrate: ...
2014 Joseph E. Pesce, Ph.D. 1 Astro 113 Final Exam Review 1. What
... be 100 Mpc from the Milky Way Galaxy. According to Hubble's Law, how fast will we see this galaxy to be moving? 5. If you triple the distance from a light source, what happens to its bri ...
... be 100 Mpc from the Milky Way Galaxy. According to Hubble's Law, how fast will we see this galaxy to be moving? 5. If you triple the distance from a light source, what happens to its bri ...
Ch. 26.5 - (www.ramsey.k12.nj.us).
... Why do we think Dark Matter exists? Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration due to gravity does not match up with the amount of matter that we can see. This tells us that there must be more mass … we’re just not seeing i ...
... Why do we think Dark Matter exists? Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration due to gravity does not match up with the amount of matter that we can see. This tells us that there must be more mass … we’re just not seeing i ...
History Test Review Answers - School District of La Crosse
... 11.The__EGYPTIAN____________culture based their planting of the crops on the rising of the star Sirius, because the Nile would flood about this time. 12. ___HELIOCENTRIC__________model suggest the earth is the center of the solar system 13. The problem with ptolemy's model is he used imaginary ___C ...
... 11.The__EGYPTIAN____________culture based their planting of the crops on the rising of the star Sirius, because the Nile would flood about this time. 12. ___HELIOCENTRIC__________model suggest the earth is the center of the solar system 13. The problem with ptolemy's model is he used imaginary ___C ...
Chapter 12
... p. 433 1. Hubble noticed that all galaxies are moving away from each other. 2. Hubble proposed that the universe is expanding in all directions, and that the galaxies have taken the same amount of time to reach their present positions from an original starting point. 4. The Oscillating theory state ...
... p. 433 1. Hubble noticed that all galaxies are moving away from each other. 2. Hubble proposed that the universe is expanding in all directions, and that the galaxies have taken the same amount of time to reach their present positions from an original starting point. 4. The Oscillating theory state ...
expanding universe
... A human being is part of the whole called by us universe, a part limited in time and space. We experience ourselves, our thoughts and feelings as something separate from the rest. A kind of optical delusion of consciousness. This delusion is a kind of prison for us, restricting us to our personal d ...
... A human being is part of the whole called by us universe, a part limited in time and space. We experience ourselves, our thoughts and feelings as something separate from the rest. A kind of optical delusion of consciousness. This delusion is a kind of prison for us, restricting us to our personal d ...
Physical Cosmology
... • At z=1100 the Universe has cooled down to 3000K . Hydrogen becomes neutral (“Recombination”). • At z <~ 20 the “first” star (clusters)/small galaxies form. • At z ~ 6-10 these gradually photo-ionize the hydrogen in the IGM (“Reionization”). • At z<6 galaxies form most of their stars and grow by me ...
... • At z=1100 the Universe has cooled down to 3000K . Hydrogen becomes neutral (“Recombination”). • At z <~ 20 the “first” star (clusters)/small galaxies form. • At z ~ 6-10 these gradually photo-ionize the hydrogen in the IGM (“Reionization”). • At z<6 galaxies form most of their stars and grow by me ...
Chapter 7 Review Answers
... 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 the cosmic background radiation is that extra energy/radiation. The CBR found fits with the predictions consistent with the BBT, supporting the B ...
... 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 the cosmic background radiation is that extra energy/radiation. The CBR found fits with the predictions consistent with the BBT, supporting the B ...
物理学と幾何学
... Predictions preceded observations in the last century: General relativity has played a leading role in cosmology and astrophysics in these 90 years and produced new predictions, often by interplays with developments in microscopic physics. Many of them, although regarded as exotic at first, have bee ...
... Predictions preceded observations in the last century: General relativity has played a leading role in cosmology and astrophysics in these 90 years and produced new predictions, often by interplays with developments in microscopic physics. Many of them, although regarded as exotic at first, have bee ...
Expanding Universe
... Dark energy is stronger at large distances, and now, because of two reasons. At distance, gravity is weaker because of the laws of inverse squares. Dark energy appears to be a property of space itself, and as the universe expands, there will be more and more space. ...
... Dark energy is stronger at large distances, and now, because of two reasons. At distance, gravity is weaker because of the laws of inverse squares. Dark energy appears to be a property of space itself, and as the universe expands, there will be more and more space. ...
cosmological horizon
... gravitationally bound object is formed for example, the stars in our Galaxy are bound together by gravity, so it does not expand. ...
... gravitationally bound object is formed for example, the stars in our Galaxy are bound together by gravity, so it does not expand. ...
Historical overview
... Bang and the present. IF the expansion velocity was constant throughout the history of the Universe to the same value measured now (v=d/t=H*d with H0=70 km/s/Mpc), then the age of the Universe is 1/H0= 14 billion years (but see Lecture 7). ...
... Bang and the present. IF the expansion velocity was constant throughout the history of the Universe to the same value measured now (v=d/t=H*d with H0=70 km/s/Mpc), then the age of the Universe is 1/H0= 14 billion years (but see Lecture 7). ...
Flatness problem
The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. Such problems arise from the observation that some of the initial conditions of the universe appear to be fine-tuned to very 'special' values, and that a small deviation from these values would have had massive effects on the nature of the universe at the current time.In the case of the flatness problem, the parameter which appears fine-tuned is the density of matter and energy in the universe. This value affects the curvature of space-time, with a very specific critical value being required for a flat universe. The current density of the universe is observed to be very close to this critical value. Since the total density departs rapidly from the critical value over cosmic time, the early universe must have had a density even closer to the critical density, departing from it by one part in 1062 or less. This leads cosmologists to question how the initial density came to be so closely fine-tuned to this 'special' value.The problem was first mentioned by Robert Dicke in 1969. The most commonly accepted solution among cosmologists is cosmic inflation, the idea that the universe went through a brief period of extremely rapid expansion in the first fraction of a second after the Big Bang; along with the monopole problem and the horizon problem, the flatness problem is one of the three primary motivations for inflationary theory.