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AST 101 INTRODUCTION TO ASTRONOMY SPRING 2008
... C. For every negatively charged electron formed, a positively charged neutrino was formed at the same time; the particle pair would then annihilate each other. D. For every particle created there was also an antiparticle created of the same mass. E. As the temperature of the Universe dropped, the pa ...
... C. For every negatively charged electron formed, a positively charged neutrino was formed at the same time; the particle pair would then annihilate each other. D. For every particle created there was also an antiparticle created of the same mass. E. As the temperature of the Universe dropped, the pa ...
Astronomy - SAVE MY EXAMS!
... Suggest why radio telescopes do not have to be placed high up a mountain. ...
... Suggest why radio telescopes do not have to be placed high up a mountain. ...
EarthComm_c1s3
... temperature of the universe had cooled enough to allow atoms to form. Leftover energy from this moment can be observed today. This radiation comes from all directions in the universe. The steady-state theory has also been challenged by the discovery that galaxies were more crowded together in the pa ...
... temperature of the universe had cooled enough to allow atoms to form. Leftover energy from this moment can be observed today. This radiation comes from all directions in the universe. The steady-state theory has also been challenged by the discovery that galaxies were more crowded together in the pa ...
Hubble - STScI
... speeds and works in opposition to gravity. Hubble observations of distant exploding stars called supernovas placed the most significant constraints to date on the nature of dark energy, revealing that it does appear to be a constant presence as first anticipated early last century by scientist Alber ...
... speeds and works in opposition to gravity. Hubble observations of distant exploding stars called supernovas placed the most significant constraints to date on the nature of dark energy, revealing that it does appear to be a constant presence as first anticipated early last century by scientist Alber ...
Spec Point Description Learnt Revised? Topic 1 – Visible Light and
... Describe the role of gravity in the life cycle of stars. Describe how the evolution of stars with a mass larger than the Sun is different, and may end in a black hole or neutron star. Demonstrate an understanding of the Steady State and Big Bang theories. Describe evidence supporting the Big Bang th ...
... Describe the role of gravity in the life cycle of stars. Describe how the evolution of stars with a mass larger than the Sun is different, and may end in a black hole or neutron star. Demonstrate an understanding of the Steady State and Big Bang theories. Describe evidence supporting the Big Bang th ...
Scientific Revolution
... • “The calculus is essentially an algebraic method for understanding (i.e., calculating and measuring) the variation in properties (such as velocities) which may be altered in infinitesimal differences, that is, in properties that are continuous. In our study at home we may have 200 books or 2,000, ...
... • “The calculus is essentially an algebraic method for understanding (i.e., calculating and measuring) the variation in properties (such as velocities) which may be altered in infinitesimal differences, that is, in properties that are continuous. In our study at home we may have 200 books or 2,000, ...
THE TOPOLOGY OF THE UNIVERSE Is the Universe crumpled?
... and makes it multi-connected. From this one can build universe models where space is finite (although the curvature can be negative or zero) and of a really small volume. They are called "small universes". The simplest example is when our space would be a hypertorus having a radius lower than five b ...
... and makes it multi-connected. From this one can build universe models where space is finite (although the curvature can be negative or zero) and of a really small volume. They are called "small universes". The simplest example is when our space would be a hypertorus having a radius lower than five b ...
Inquiry Lab: Exploring the Spectrum Intended Learning Outcomes: 1
... scientists observe and the theories that are developed from these observations. This activity should help students accomplish the following: 1) understand that light sources give off spectrums and spectral lines, 2) make connections between personal observations and the spectral lines found in star ...
... scientists observe and the theories that are developed from these observations. This activity should help students accomplish the following: 1) understand that light sources give off spectrums and spectral lines, 2) make connections between personal observations and the spectral lines found in star ...
What if Time Really Exists?
... embodies a stark form of presentism: it simply tells us which states the universe can find itself in, and says nothing about any evolution through time. However, these perspectives should not convince us to give up on the reality of time. For one thing, they may not be right; there are deep issues h ...
... embodies a stark form of presentism: it simply tells us which states the universe can find itself in, and says nothing about any evolution through time. However, these perspectives should not convince us to give up on the reality of time. For one thing, they may not be right; there are deep issues h ...
Neutrino hot dark matter and hydrodynamics of structure formation
... • Lynden Bell: violent relaxation, faster than collisional • Relaxation in time-dependent potential: every object (individual particle, galaxy) exchanges energy with the whole cluster • Iff phase space density becomes uniform, then Fermi-Dirac distribution • X-ray radiation helps to maintain the vir ...
... • Lynden Bell: violent relaxation, faster than collisional • Relaxation in time-dependent potential: every object (individual particle, galaxy) exchanges energy with the whole cluster • Iff phase space density becomes uniform, then Fermi-Dirac distribution • X-ray radiation helps to maintain the vir ...
Science Says: What Scientific Evidence Can Say About the
... indicate an expansion that would not stop until it ran out of energy. This constant makes masses such as galaxies appear to repel each other. Gravity, on the other hand, would pull them together. This push and pull is not equal, of course. In a young universe, where most of the mass is in one place, ...
... indicate an expansion that would not stop until it ran out of energy. This constant makes masses such as galaxies appear to repel each other. Gravity, on the other hand, would pull them together. This push and pull is not equal, of course. In a young universe, where most of the mass is in one place, ...
Instructor`s Guide
... Big Bang: A model of the initial conditions and subsequent development of the universe. The theory deduces the explosion of a small (smaller than a dime!), hot, dense mass about 13 billion years ago which eventually resulted in the scattering of elements that then formed the stars and planets. The i ...
... Big Bang: A model of the initial conditions and subsequent development of the universe. The theory deduces the explosion of a small (smaller than a dime!), hot, dense mass about 13 billion years ago which eventually resulted in the scattering of elements that then formed the stars and planets. The i ...
Day 15
... Newton had used a similar method and come up with a distance of 1 million AU to Sirius. He simply couldn’t believe it was that large so he didn’t publish his results. ...
... Newton had used a similar method and come up with a distance of 1 million AU to Sirius. He simply couldn’t believe it was that large so he didn’t publish his results. ...
P1 The Earth in the Universe
... does now and hasn’t changed. The trouble is that the night sky would be completely lit up because of the billions of stars, but it’s not, so… The “Big Bang” theory This theory states that the universe started off with an explosion and everything has been moving away ever since. There are two main pi ...
... does now and hasn’t changed. The trouble is that the night sky would be completely lit up because of the billions of stars, but it’s not, so… The “Big Bang” theory This theory states that the universe started off with an explosion and everything has been moving away ever since. There are two main pi ...
2. The Universe Is Expanding and Evolving
... towards) us. By 1929 it was clear that almost all of the galaxies are moving away from us, and that the speed of recession (the redshift) increases with the distance to the galaxy. This became known as Hubble’s Law. The expansion of the universe had been discovered. When Einstein heard about this, h ...
... towards) us. By 1929 it was clear that almost all of the galaxies are moving away from us, and that the speed of recession (the redshift) increases with the distance to the galaxy. This became known as Hubble’s Law. The expansion of the universe had been discovered. When Einstein heard about this, h ...
Effects of Gravitation
... After 1916, Einstein and others applied the General Theory of Relativity, the modern theory of gravity to the entire universe. The basic ideas are so simple and compelling that it seems that they must be correct and most of the observational data are in complete concordance. Despite this simplicity, ...
... After 1916, Einstein and others applied the General Theory of Relativity, the modern theory of gravity to the entire universe. The basic ideas are so simple and compelling that it seems that they must be correct and most of the observational data are in complete concordance. Despite this simplicity, ...
Big Bang Theory
... cooled enough to allow protons and neutrons to fuse together to form atomic nuclei, a process known as nucleo-synthesis. ...
... cooled enough to allow protons and neutrons to fuse together to form atomic nuclei, a process known as nucleo-synthesis. ...
Cos. Won edu 2 - Adler Planetarium
... high above the atmosphere of the Earth and is able to see the Universe more clearly, without blurring that is caused by the atmosphere. Many telescopes and satellites detect different ranges of energy on the electromagnetic spectrum. The electromagnetic spectrum defines the wavelengths and frequenci ...
... high above the atmosphere of the Earth and is able to see the Universe more clearly, without blurring that is caused by the atmosphere. Many telescopes and satellites detect different ranges of energy on the electromagnetic spectrum. The electromagnetic spectrum defines the wavelengths and frequenci ...
The relationship between difference and ratio and a proposal
... as an energy density, yet manifests itself in the abundance of de facto not reversed ‘directed’ motion, hence, is a measure for kinetic energy density of the irreversible. Time only exists if there is change, most generally, change in the state of the object(s) in question; objects being particles o ...
... as an energy density, yet manifests itself in the abundance of de facto not reversed ‘directed’ motion, hence, is a measure for kinetic energy density of the irreversible. Time only exists if there is change, most generally, change in the state of the object(s) in question; objects being particles o ...
1201 Discussion Notes
... Dark Matter in Spiral and Elliptical Galaxies A rotation curve is a graph of (linear) rotational velocity vs. distance from a central point. On Nov. 17, we talked about rotation curves, although we didn’t call them by name, and how they indicated that most of the mass in our galaxy is in the halo. R ...
... Dark Matter in Spiral and Elliptical Galaxies A rotation curve is a graph of (linear) rotational velocity vs. distance from a central point. On Nov. 17, we talked about rotation curves, although we didn’t call them by name, and how they indicated that most of the mass in our galaxy is in the halo. R ...
Lecture 1 - Department of Physics and Astronomy
... The speed of light is a universal constant, it does not change over time or from place to place. Thought Experiment: imagine two teams of scientist measuring the speed of a beam of light. One team measures the speed from a ground. The second team measures the speed from a fast moving airplane foll ...
... The speed of light is a universal constant, it does not change over time or from place to place. Thought Experiment: imagine two teams of scientist measuring the speed of a beam of light. One team measures the speed from a ground. The second team measures the speed from a fast moving airplane foll ...
doc
... measuring the rotation curves of these galaxies. If the mass of the galaxy were centrally concentrated, the rotation speed should drop as the square of the distance from the nucleus. Instead it appears the rotation curves remain flat out to large distance (beyond the visible edge of the galaxy), ind ...
... measuring the rotation curves of these galaxies. If the mass of the galaxy were centrally concentrated, the rotation speed should drop as the square of the distance from the nucleus. Instead it appears the rotation curves remain flat out to large distance (beyond the visible edge of the galaxy), ind ...
File1 - School of Astronomy, IPM
... • Time derivation results distribution of particles in phase space. • Second order derivative: • For stationary system the left-hand side is zero and we will have a stationary condition. • For the case of ...
... • Time derivation results distribution of particles in phase space. • Second order derivative: • For stationary system the left-hand side is zero and we will have a stationary condition. • For the case of ...
Non-standard cosmology
![](https://commons.wikimedia.org/wiki/Special:FilePath/WMAP2.jpg?width=300)
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.