![Document](http://s1.studyres.com/store/data/008079181_1-c466be727517f22eba2a91ed75c26a65-300x300.png)
Document
... If the universe extends infinitely, then eventually if we look out into the night sky, we should be able to see a star in any direction, even if the star is really far away. Since the universe was infinitely old, the light from stars at extremely far distances would have already reached us, even if ...
... If the universe extends infinitely, then eventually if we look out into the night sky, we should be able to see a star in any direction, even if the star is really far away. Since the universe was infinitely old, the light from stars at extremely far distances would have already reached us, even if ...
Practice Questions for Final
... C. During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything annihilated except the very slight excess of matter particles. D. GUT theories predict that under the conditions that prevailed in the early universe, the ...
... C. During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything annihilated except the very slight excess of matter particles. D. GUT theories predict that under the conditions that prevailed in the early universe, the ...
Star Planet - Stony Brook Astronomy
... A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, but we will watch it disperse over the next 10,000 Earth years. C. The image of the supernova dispersing will not reach us for ano ...
... A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, but we will watch it disperse over the next 10,000 Earth years. C. The image of the supernova dispersing will not reach us for ano ...
ASTR 105 Intro Astronomy: The Solar System
... group; located 2.6 million ly away). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, but we will watch it dispers ...
... group; located 2.6 million ly away). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, but we will watch it dispers ...
Matter is everything around you.
... One of the best known theories in cosmology is the Big Bang. This is the idea that our universe started out much hotter and denser than it is now and has been expanding since then. This theory is based on observations of our universe, among which are: External galaxies are receding in such a way tha ...
... One of the best known theories in cosmology is the Big Bang. This is the idea that our universe started out much hotter and denser than it is now and has been expanding since then. This theory is based on observations of our universe, among which are: External galaxies are receding in such a way tha ...
Cosmic Dawn A Hunting for the First Stars in the Universe
... What astronomers call the “pollution” of the universe was a two-step process, in which new chemicals were first created, and then distributed over wide volumes. It is widely known that stars behave like natural nuclear fusion reactors at their cores, and this is indeed how a star spends the majority ...
... What astronomers call the “pollution” of the universe was a two-step process, in which new chemicals were first created, and then distributed over wide volumes. It is widely known that stars behave like natural nuclear fusion reactors at their cores, and this is indeed how a star spends the majority ...
The Universe and Galaxies - West Jefferson Local Schools
... undetectable mass that adds to the gravity of a galaxy - Dark energy – theoretical energy that might be causing accelerated expansion of the universe ...
... undetectable mass that adds to the gravity of a galaxy - Dark energy – theoretical energy that might be causing accelerated expansion of the universe ...
1. Put these objects in the correct order, from nearest
... C. False, even a spacecraft that moved close to the speed of light would take tens of thousands of years to get to a good vantage point. D. False, as the Sun and Earth move through the galaxy, we will be able to take a photograph from a different perspective. E. False, several NASA spacecrafts have ...
... C. False, even a spacecraft that moved close to the speed of light would take tens of thousands of years to get to a good vantage point. D. False, as the Sun and Earth move through the galaxy, we will be able to take a photograph from a different perspective. E. False, several NASA spacecrafts have ...
Chapter 1 Our Place in the Universe
... Observations of galaxies show that the entire universe is expanding, the average distance between galaxies is increasing with time. This means that galaxies ( or at least matter) must have been close together in the past. If we go back far enough, all the matter was concentrated in a small radius fr ...
... Observations of galaxies show that the entire universe is expanding, the average distance between galaxies is increasing with time. This means that galaxies ( or at least matter) must have been close together in the past. If we go back far enough, all the matter was concentrated in a small radius fr ...
Activity 1 - Galaxies
... of a balloon, all galaxies are moving apart from each other, there is no centre!). Matter was thrown out in all directions forming stars and galaxies. Both Space and time were created in the Big Bang. However the Big Bang theory had some competition… ...
... of a balloon, all galaxies are moving apart from each other, there is no centre!). Matter was thrown out in all directions forming stars and galaxies. Both Space and time were created in the Big Bang. However the Big Bang theory had some competition… ...
Time From the Perspective of a Particle Physicist
... Cosmology. Hubble law Universe is expanding, gives universe’s age, depends on Hubble “constant” changes with time. Closed universe has gravity slowing the expansion so it starts to contract. Open universe expands forever. Early universe was very hot and when matter was created. First electrons, pr ...
... Cosmology. Hubble law Universe is expanding, gives universe’s age, depends on Hubble “constant” changes with time. Closed universe has gravity slowing the expansion so it starts to contract. Open universe expands forever. Early universe was very hot and when matter was created. First electrons, pr ...
Great Discoveries in Astronomy and Astrophysics 171.112
... 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 hundreds of years and many orders of magnitude of astrono ...
... 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 hundreds of years and many orders of magnitude of astrono ...
Big Bang and Beyond
... Interpretations of the results • IF the density of the matter after 1 nsec from the Big Bang is equal to 447,225,917,218,507,401,284,017 mg/cc, the Universe would have collapsed by now. • IF the density of the matter after 1 nsec from the Big Bang is equal to 447,225,917,218,507,401,284,015 mg/cc, ...
... Interpretations of the results • IF the density of the matter after 1 nsec from the Big Bang is equal to 447,225,917,218,507,401,284,017 mg/cc, the Universe would have collapsed by now. • IF the density of the matter after 1 nsec from the Big Bang is equal to 447,225,917,218,507,401,284,015 mg/cc, ...
Talk - Otterbein University
... and its luminosity • The more mass a galaxy has the brighter it is the faster it rotates the wider the spectral lines are • Measuring rotation speed allows us to estimate luminosity; comparing to observed (apparent) brightness then tells us the distance ...
... and its luminosity • The more mass a galaxy has the brighter it is the faster it rotates the wider the spectral lines are • Measuring rotation speed allows us to estimate luminosity; comparing to observed (apparent) brightness then tells us the distance ...
Miss Nevoral - Ms. Nevoral`s site
... spectral lines produced by stars and galaxies and to measure their wavelengths. 10. What does the cosmological red shift suggest about the motion of galaxies? The cosmological red shift suggests that galaxies are moving away from each other. 11. Who first proposed the Big Bang Theory and in what yea ...
... spectral lines produced by stars and galaxies and to measure their wavelengths. 10. What does the cosmological red shift suggest about the motion of galaxies? The cosmological red shift suggests that galaxies are moving away from each other. 11. Who first proposed the Big Bang Theory and in what yea ...
Tragedy vs. Hope: What Future in an Open Universe?
... The planet Earth is bombarded by meteorites, and occasionally such impacts have lead to major catastrophes. Their influence on the biological evolution was profound, but life on Earth has continued. This will not be the case forever. The Sun has fused already a few percent of its hydrogen fuel into ...
... The planet Earth is bombarded by meteorites, and occasionally such impacts have lead to major catastrophes. Their influence on the biological evolution was profound, but life on Earth has continued. This will not be the case forever. The Sun has fused already a few percent of its hydrogen fuel into ...
Educator`s Guide to the Cullman Hall of the Universe, Heilbrunn
... time to travel, the farther out into space we look, the further back in time we see. When we flip a switch we see the light almost instantly, but sunlight is eight minutes old, light from nearby stars has taken years or centuries to reach us, and light from distant galaxies can be millions or even b ...
... time to travel, the farther out into space we look, the further back in time we see. When we flip a switch we see the light almost instantly, but sunlight is eight minutes old, light from nearby stars has taken years or centuries to reach us, and light from distant galaxies can be millions or even b ...
Document
... a) supernova as standard candles to determine far distances b) patterns of small variation in the CMB c) galaxy rotation measurements ...
... a) supernova as standard candles to determine far distances b) patterns of small variation in the CMB c) galaxy rotation measurements ...
Where do you find yourself now??
... The map shows several stars visible with the naked eye which are located deep within the Orion arm. The most notable group of stars here are main stars in the constellation of Orion -from which the spiral arm gets its name. All of these stars are bright giant and supergiant -stars, thousands of time ...
... The map shows several stars visible with the naked eye which are located deep within the Orion arm. The most notable group of stars here are main stars in the constellation of Orion -from which the spiral arm gets its name. All of these stars are bright giant and supergiant -stars, thousands of time ...
Article: How Big is our Universe
... Image to right: Our sun, the nearest star, is 93 million miles away. That's why the sun, which is a million times the size of the Earth, looks so small. It would take the Space Shuttle seven months to fly there. Credit: SOHO - ESA & NASA When we leave the solar system, we find our star and its plane ...
... Image to right: Our sun, the nearest star, is 93 million miles away. That's why the sun, which is a million times the size of the Earth, looks so small. It would take the Space Shuttle seven months to fly there. Credit: SOHO - ESA & NASA When we leave the solar system, we find our star and its plane ...
Size and Scale of the Universe
... • There could be (and likely is) much more beyond that, but we cannot see it from this point in spacetime • Note: The matter that we can see glowing shortly after the Big Bang (detected by the light it emitted 13.7 billion years ago) is now about 46 billion light-years away due to the ongoing expans ...
... • There could be (and likely is) much more beyond that, but we cannot see it from this point in spacetime • Note: The matter that we can see glowing shortly after the Big Bang (detected by the light it emitted 13.7 billion years ago) is now about 46 billion light-years away due to the ongoing expans ...
7.1 What The Heavens Are Declaring About God`s
... When we look at a sky object one million light years away, the light we see has taken one million years to arrive which means what we are seeing is one million years old. By looking at similar galaxies at various distances from thousands to billions of light years, it is possible to look back in tim ...
... When we look at a sky object one million light years away, the light we see has taken one million years to arrive which means what we are seeing is one million years old. By looking at similar galaxies at various distances from thousands to billions of light years, it is possible to look back in tim ...
Size and Scale of the Universe
... • There could be (and likely is) much more beyond that, but we cannot see it from this point in spacetime • Note: The matter that we can see glowing shortly after the Big Bang (detected by the light it emitted 13.7 billion years ago) is now about 46 billion light-years away due to the ongoing expans ...
... • There could be (and likely is) much more beyond that, but we cannot see it from this point in spacetime • Note: The matter that we can see glowing shortly after the Big Bang (detected by the light it emitted 13.7 billion years ago) is now about 46 billion light-years away due to the ongoing expans ...
The Universe and Galaxies - West Jefferson Local Schools
... undetectable mass that adds to the gravity of a galaxy - Dark energy – theoretical energy that might be causing accelerated expansion of the universe ...
... undetectable mass that adds to the gravity of a galaxy - Dark energy – theoretical energy that might be causing accelerated expansion of the universe ...
News Release - האוניברסיטה העברית
... some ten billion years ago (about three billion years after the Big Bang which first established the Universe). “The large galaxies, as they appear in this early stage, indeed created stars at a very rapid rate, but this does not appear to be at all a result of galactic mergers,” says Prof. Dekel. T ...
... some ten billion years ago (about three billion years after the Big Bang which first established the Universe). “The large galaxies, as they appear in this early stage, indeed created stars at a very rapid rate, but this does not appear to be at all a result of galactic mergers,” says Prof. Dekel. T ...
Universe
![](https://commons.wikimedia.org/wiki/Special:FilePath/Ilc_9yr_moll4096.png?width=300)
The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The observable universe is about 28 billion parsecs (91 billion light-years) in diameter at the present time. The size of the whole Universe is not known and may be infinite. Observations and the development of physical theories have led to inferences about the composition and evolution of the Universe.Throughout recorded history, cosmologies and cosmogonies, including scientific models, have been proposed to explain observations of the Universe. The earliest quantitative geocentric models were developed by ancient Greek philosophers and Indian philosophers. Over the centuries, more precise astronomical observations led to Nicolaus Copernicus's heliocentric model of the Solar System and Johannes Kepler's improvement on that model with elliptical orbits, which was eventually explained by Isaac Newton's theory of gravity. Further observational improvements led to the realization that the Solar System is located in a galaxy composed of billions of stars, the Milky Way. It was subsequently discovered that our galaxy is just one of many. On the largest scales, it is assumed that the distribution of galaxies is uniform and the same in all directions, meaning that the Universe has neither an edge nor a center. Observations of the distribution of these galaxies and their spectral lines have led to many of the theories of modern physical cosmology. The discovery in the early 20th century that galaxies are systematically redshifted suggested that the Universe is expanding, and the discovery of the cosmic microwave background radiation suggested that the Universe had a beginning. Finally, observations in the late 1990s indicated the rate of the expansion of the Universe is increasing indicating that the majority of energy is most likely in an unknown form called dark energy. The majority of mass in the universe also appears to exist in an unknown form, called dark matter.The Big Bang theory is the prevailing cosmological model describing the development of the Universe. Space and time were created in the Big Bang, and these were imbued with a fixed amount of energy and matter; as space expands, the density of that matter and energy decreases. After the initial expansion, the Universe cooled sufficiently to allow the formation first of subatomic particles and later of simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars. Assuming that the prevailing model is correct, the age of the Universe is measured to be 7001137990000000000♠13.799±0.021 billion years.There are many competing hypotheses about the ultimate fate of the Universe. Physicists and philosophers remain unsure about what, if anything, preceded the Big Bang. Many refuse to speculate, doubting that any information from any such prior state could ever be accessible. There are various multiverse hypotheses, in which some physicists have suggested that the Universe might be one among many universes that likewise exist.