Astronomy perspective
... “That is the curse of statistics, that it can never prove things, only disprove them! At best, you can substantiate a hypothesis by ruling out, statistically, a whole long list of competing hypotheses, every one that has ever been proposed. After a while your adversaries and competitors will give u ...
... “That is the curse of statistics, that it can never prove things, only disprove them! At best, you can substantiate a hypothesis by ruling out, statistically, a whole long list of competing hypotheses, every one that has ever been proposed. After a while your adversaries and competitors will give u ...
A-Temporal Universe
... of the universe, but they accept that part of the ”red shift” is a result of the light ”escaping” out of the strong gravitational field of the galaxies from which it comes to reach Earth. Van Flandern view is that the red shift is not proof for an expanding universe, moreover several discoveries con ...
... of the universe, but they accept that part of the ”red shift” is a result of the light ”escaping” out of the strong gravitational field of the galaxies from which it comes to reach Earth. Van Flandern view is that the red shift is not proof for an expanding universe, moreover several discoveries con ...
Introduction to the Universe
... • How long since Car 1 left you? • Car 2? • Car 3? • How old is the “car universe?” • This is exactly what we see with galaxies, except the time is _________ years. ...
... • How long since Car 1 left you? • Car 2? • Car 3? • How old is the “car universe?” • This is exactly what we see with galaxies, except the time is _________ years. ...
Mysteries of Space
... • The mass discovered by scientists for this galaxy used the estimated mass to estimate the speed of various stars movement and discovered that they are moving much faster than predicted. The way scientists have explained this phenomenon is that there must be 90 times more matter that is not visible ...
... • The mass discovered by scientists for this galaxy used the estimated mass to estimate the speed of various stars movement and discovered that they are moving much faster than predicted. The way scientists have explained this phenomenon is that there must be 90 times more matter that is not visible ...
rhic - Wayne State University
... If the QGP was formed, it will only live for 10-21 s !!!! BUT does matter come out of this phase the same way it went in ??? ...
... If the QGP was formed, it will only live for 10-21 s !!!! BUT does matter come out of this phase the same way it went in ??? ...
ASTR 1120-001 Final Examination Phil Armitage, Bruce Ferguson
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
distance to the centre of the Milky Way.
... In ~1900, “Universe” = the distribution of stars within which we find ourselves (i.e. the Milky Way). It was believed to lie in a vast (perhaps infinite) void. ...
... In ~1900, “Universe” = the distribution of stars within which we find ourselves (i.e. the Milky Way). It was believed to lie in a vast (perhaps infinite) void. ...
Universe, Galaxies, and Stars – The Basics
... understand starlight we also need to remember that light is a wave. Different colors have different wavelengths. Of visible light, red is the most mild (longer wavelengths) and violet is the most intense (shorter wavelengths). So say you decide to wear your nicest yellow shirt. You’re looking good… ...
... understand starlight we also need to remember that light is a wave. Different colors have different wavelengths. Of visible light, red is the most mild (longer wavelengths) and violet is the most intense (shorter wavelengths). So say you decide to wear your nicest yellow shirt. You’re looking good… ...
What is the dark matter?
... freeze (0.1 K), ½-mile underground in Soudan, MN This experiment has not seen WIMPS yet, but has placed the best current limits on their properties if they exist. See Technology Review May/June 2009! ...
... freeze (0.1 K), ½-mile underground in Soudan, MN This experiment has not seen WIMPS yet, but has placed the best current limits on their properties if they exist. See Technology Review May/June 2009! ...
Our Universe - E Natural Health Center
... bang that occurred at least 15,000,000,000 years ago. Although this type of universe was proposed by Alexander Friedmann and Abbé Georges Lemaître in the 1920s, the modern version was developed by George Gamow and colleagues in the 1940s. The big-bang model is based on two assumptions. The first is ...
... bang that occurred at least 15,000,000,000 years ago. Although this type of universe was proposed by Alexander Friedmann and Abbé Georges Lemaître in the 1920s, the modern version was developed by George Gamow and colleagues in the 1940s. The big-bang model is based on two assumptions. The first is ...
1 - Uplift North Hills Prep
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
Document
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
Gravity
... • bodies follow shortest path through curved spacetime (geodesics) • dynamics: ‐ action through curvature space ‐ travels with velocity of light ...
... • bodies follow shortest path through curved spacetime (geodesics) • dynamics: ‐ action through curvature space ‐ travels with velocity of light ...
speech on dark matter
... I have been studying Physics for approximately four months, and if I have learnt anything through my lectures and reading, it is that there are STILL some major problems with our comprehension of the universe that we exist in. Before my studies I (somewhat naively perhaps) assumed that after the exi ...
... I have been studying Physics for approximately four months, and if I have learnt anything through my lectures and reading, it is that there are STILL some major problems with our comprehension of the universe that we exist in. Before my studies I (somewhat naively perhaps) assumed that after the exi ...
ASTR 1020 General Astronomy: Stars and Galaxies REVIEW
... As r approaches Rs δt gets longer and longer. When r reaches the event horizon, time stops. ...
... As r approaches Rs δt gets longer and longer. When r reaches the event horizon, time stops. ...
Lecture 9
... enough below the ionization energy of 13.6 eV, protons and neutrons will combine to form more complicated nuclei once the energy per photon falls far enough below the binding energy of a few MeV. ...
... enough below the ionization energy of 13.6 eV, protons and neutrons will combine to form more complicated nuclei once the energy per photon falls far enough below the binding energy of a few MeV. ...
absolute past
... are expanding, they must at some point have been closer together than they are now. If they are expanding today, they must have been closer together yesterday, and still closer the day before yesterday, and so on until we find a beginning of the expansion. Hubble was able to calculate the rate by wh ...
... are expanding, they must at some point have been closer together than they are now. If they are expanding today, they must have been closer together yesterday, and still closer the day before yesterday, and so on until we find a beginning of the expansion. Hubble was able to calculate the rate by wh ...
Problems with the Perfect Circles
... are expanding, they must at some point have been closer together than they are now. If they are expanding today, they must have been closer together yesterday, and still closer the day before yesterday, and so on until we find a beginning of the expansion. Hubble was able to calculate the rate by wh ...
... are expanding, they must at some point have been closer together than they are now. If they are expanding today, they must have been closer together yesterday, and still closer the day before yesterday, and so on until we find a beginning of the expansion. Hubble was able to calculate the rate by wh ...
Extension worksheet – Topic 6 - Cambridge Resources for the IB
... Referring to the diagram of the previous question we see that with the three models drawn coincident at the present time; their starting points are different. ...
... Referring to the diagram of the previous question we see that with the three models drawn coincident at the present time; their starting points are different. ...
Gravity - Indiana University Astronomy
... Part 10: Beyond the Solar System – Gravity dominates not only the planets of the Solar System, but all of the bodies of the Universe – stars, galaxies, even clusters of galaxies. Each small group will consider ONE of the following problems to discuss with the class. Circle the number of the problem ...
... Part 10: Beyond the Solar System – Gravity dominates not only the planets of the Solar System, but all of the bodies of the Universe – stars, galaxies, even clusters of galaxies. Each small group will consider ONE of the following problems to discuss with the class. Circle the number of the problem ...
On the Cosmological Variation of the Fine Structure Constant
... Recently, evidence indicating cosmological variations of the fine structure constant, α, has been reported. This result led to the conclusion that possibly the physical constants and the laws of physics vary throughout the universe. However, it will be shown here that variations in the value of the ...
... Recently, evidence indicating cosmological variations of the fine structure constant, α, has been reported. This result led to the conclusion that possibly the physical constants and the laws of physics vary throughout the universe. However, it will be shown here that variations in the value of the ...
Problem Set 8
... Notice that the total charge is zero at all times; the change occurs only through currents in the wire. Find the current density in the wire (with direction) vs. z and time during this process, by using the continuity equation and then integrating. Note that no current can be flowing into the ends o ...
... Notice that the total charge is zero at all times; the change occurs only through currents in the wire. Find the current density in the wire (with direction) vs. z and time during this process, by using the continuity equation and then integrating. Note that no current can be flowing into the ends o ...
Historical Overview of the Universe
... as it appeared at the turn of the millennium. The science of the Universe as a whole is called cosmology, which draws on the knowledge of other branches of learning like astronomy and physics. Cosmology does not claim to possess final answers and may be better described as the study of models of the ...
... as it appeared at the turn of the millennium. The science of the Universe as a whole is called cosmology, which draws on the knowledge of other branches of learning like astronomy and physics. Cosmology does not claim to possess final answers and may be better described as the study of models of the ...
Stars - Stallion Science
... • If there isn’t enough mass – gravity will not be strong enough to stop the expansion • Just right amount of mass – the expansion will slow down but not end completely • Too much mass – gravity will overcome the expansion and the universe will start to contract (the big crunch), becoming very hot a ...
... • If there isn’t enough mass – gravity will not be strong enough to stop the expansion • Just right amount of mass – the expansion will slow down but not end completely • Too much mass – gravity will overcome the expansion and the universe will start to contract (the big crunch), becoming very hot a ...
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.