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7th Grade Astronomy Study Guide
... ____ 36. According to the big bang theory, the universe is about a. 4.7 billion years old. c. 470 billion years old. b. 13.7 billion years old. d. 500 billion years old. ____ 37. Scientists think that the Milky Way probably is a. an irregular galaxy. c. an elliptical galaxy. b. a spiral galaxy. d. a ...
... ____ 36. According to the big bang theory, the universe is about a. 4.7 billion years old. c. 470 billion years old. b. 13.7 billion years old. d. 500 billion years old. ____ 37. Scientists think that the Milky Way probably is a. an irregular galaxy. c. an elliptical galaxy. b. a spiral galaxy. d. a ...
Wh t i C l ? What is Cosmology?
... doesn’t work: dust will heat up over time until it reaches the same temperature as the stars that illuminate it ...
... doesn’t work: dust will heat up over time until it reaches the same temperature as the stars that illuminate it ...
AstronomyQuotes
... center of the universe. This one misconception led people to entertain complex and ultimately untrue laws of nature, for example, that the planets traveled around earth in complex retrograde cycles. In 1542, Copernicus published “Concerning the Revolutions of the Heavenly Spears,” which replaced pri ...
... center of the universe. This one misconception led people to entertain complex and ultimately untrue laws of nature, for example, that the planets traveled around earth in complex retrograde cycles. In 1542, Copernicus published “Concerning the Revolutions of the Heavenly Spears,” which replaced pri ...
ASTR100 Class 01 - University of Maryland Department of
... This photo shows the Andromeda Galaxy as it looked about 2½ million years ago. Question: When will be able to see what it looks like now? ...
... This photo shows the Andromeda Galaxy as it looked about 2½ million years ago. Question: When will be able to see what it looks like now? ...
Light Energy, Dark Energy 1. Another View of Olber's Paradox
... 3. Could your answer for #2 be true if the universe were infinitely old? No – if the amount of something is increasing, it can only have been increasing for a certain amount of time. For example, the number of people on Earth is increasing now – but clearly this can't have been going on forever into ...
... 3. Could your answer for #2 be true if the universe were infinitely old? No – if the amount of something is increasing, it can only have been increasing for a certain amount of time. For example, the number of people on Earth is increasing now – but clearly this can't have been going on forever into ...
The human race has made great strides in the last few centuries
... core can get hotter still, burning its way up the periodic table to iron, which cannot be nuclear burned. When the degenerate iron core reaches the Chandrasekhar Limit, it rapidly collapses. Vast amounts of energy are suddenly released as a supernova, mostly from the gravitational collapse. Some of ...
... core can get hotter still, burning its way up the periodic table to iron, which cannot be nuclear burned. When the degenerate iron core reaches the Chandrasekhar Limit, it rapidly collapses. Vast amounts of energy are suddenly released as a supernova, mostly from the gravitational collapse. Some of ...
Theory of the Infinite Universe
... Our universe extends outward in three dimensions into infinity. The universe is populated by a great number of endothermic stars, which are scattered about the universe. Many of these are very ...
... Our universe extends outward in three dimensions into infinity. The universe is populated by a great number of endothermic stars, which are scattered about the universe. Many of these are very ...
Distant galaxies and quasars The ages of things Light
... – redshift z=0.158 – 15% of the age of the Universe !!! Observations of distant objects allows us to study the history of the Universe ...
... – redshift z=0.158 – 15% of the age of the Universe !!! Observations of distant objects allows us to study the history of the Universe ...
TA`s solution set
... If the universe were also infinitely old, then light would have had time to reach us along all of these sightlines! (If the universe had finite age, the light from sufficiently distant stars would not have had time to reach us and some lines of sight would appear dark.) Since the night sky is, in fa ...
... If the universe were also infinitely old, then light would have had time to reach us along all of these sightlines! (If the universe had finite age, the light from sufficiently distant stars would not have had time to reach us and some lines of sight would appear dark.) Since the night sky is, in fa ...
Lecture6
... Olbers postulated that the Universe was filled with an absorbing medium, like fog However, if light is absorbed it will also re-radiate, producing light albeit at different wavelengths, so this doesn’t work! ...
... Olbers postulated that the Universe was filled with an absorbing medium, like fog However, if light is absorbed it will also re-radiate, producing light albeit at different wavelengths, so this doesn’t work! ...
Astro-2: History of the Universe
... Olbers postulated that the Universe was filled with an absorbing medium, like fog However, if light is absorbed it will also re-radiate, producing light albeit at different wavelengths, so this doesn’t work! ...
... Olbers postulated that the Universe was filled with an absorbing medium, like fog However, if light is absorbed it will also re-radiate, producing light albeit at different wavelengths, so this doesn’t work! ...
Astronomy - Calendar
... in distant nebulas by astronomers to a model of the universe based on relativity. Years later, Edwin Hubble found experimental evidence to help justify Lemaître's theory. He found that distant galaxies in every direction are going away from us with speeds proportional to their distance. ...
... in distant nebulas by astronomers to a model of the universe based on relativity. Years later, Edwin Hubble found experimental evidence to help justify Lemaître's theory. He found that distant galaxies in every direction are going away from us with speeds proportional to their distance. ...
Black Hole
... gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
... gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
The Expanding Universe
... The universe started with a sudden appearance of energy which consequently became matter and is now everything around us. There were two theories regarding the universe The Steady State Universe: where the universe had always been and would always continue to be in existence. The Created Universe: w ...
... The universe started with a sudden appearance of energy which consequently became matter and is now everything around us. There were two theories regarding the universe The Steady State Universe: where the universe had always been and would always continue to be in existence. The Created Universe: w ...
Chapter 18 - the Universe Begins
... hot for even the most basic building blocks of matter to exist. After this time, as the Universe expanded (see Fig. 18.9) and cooled, energy began to condense into matter (according to Einstein’s mass–energy relationship), forming matter and anti-matter in approximately equal proportions. As the ant ...
... hot for even the most basic building blocks of matter to exist. After this time, as the Universe expanded (see Fig. 18.9) and cooled, energy began to condense into matter (according to Einstein’s mass–energy relationship), forming matter and anti-matter in approximately equal proportions. As the ant ...
lecture1
... • The subject of the discipline is unique: we only have one Universe, we cannot replicate/alter/reproduce our ...
... • The subject of the discipline is unique: we only have one Universe, we cannot replicate/alter/reproduce our ...
Grade 11 Cosmology PPT File
... The gravitational attraction will eventually overcome the expansion. The Universe will stop expanding and then collapse to an eventual big crunch This is called a closed universe. Alternatively the expansion slows to zero ‘at infinity’. This is called a flat universe. If there is not enough mass for ...
... The gravitational attraction will eventually overcome the expansion. The Universe will stop expanding and then collapse to an eventual big crunch This is called a closed universe. Alternatively the expansion slows to zero ‘at infinity’. This is called a flat universe. If there is not enough mass for ...
WHERE DO ELEMENTS COME FROM?
... • Universe itself started at a “singularity” – not static – expands “into itself” ...
... • Universe itself started at a “singularity” – not static – expands “into itself” ...
The measure of Cosmological distances
... Why Geocentric ? 1. "we see" 2. if the earth moves, where is the wind ? 3. Gravity – everything is attracted to the center of the universe 4. Parallax: stars don't move ! ...
... Why Geocentric ? 1. "we see" 2. if the earth moves, where is the wind ? 3. Gravity – everything is attracted to the center of the universe 4. Parallax: stars don't move ! ...
A time travel of 14 billion years
... The big bang •It occurred right here, nearly 14 billion years ago. • All matter and energy of the Universe were concentrated in a very small space region. •At the beginning temperature was extremely high. Nuclei and atom constituents formed a primordial soup. •Since that moment the Universe expande ...
... The big bang •It occurred right here, nearly 14 billion years ago. • All matter and energy of the Universe were concentrated in a very small space region. •At the beginning temperature was extremely high. Nuclei and atom constituents formed a primordial soup. •Since that moment the Universe expande ...
The measure of Cosmological distances
... Why Geocentric ? 1. "we see" 2. if the earth moves, where is the wind ? 3. Gravity – everything is attracted to the center of the universe 4. Parallax: stars don't move ! ...
... Why Geocentric ? 1. "we see" 2. if the earth moves, where is the wind ? 3. Gravity – everything is attracted to the center of the universe 4. Parallax: stars don't move ! ...
OCN 201 Origin of the Universe
... Explosive energy from Big Bang could expand Universe forever. Gravity could also cause it to collapse back, it all depends on the amount of mass in Universe ...
... Explosive energy from Big Bang could expand Universe forever. Gravity could also cause it to collapse back, it all depends on the amount of mass in Universe ...
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.