THE BIG BANG - Dublin City Schools
... • They use radioactive dating of uranium isotopes! • we know that the oldest isotopes were created (through nuclear reactions in supernovae) about 10 billion years ago. ...
... • They use radioactive dating of uranium isotopes! • we know that the oldest isotopes were created (through nuclear reactions in supernovae) about 10 billion years ago. ...
Lecture 1
... molecules is generally referred to as baryonic matter. The photon (γ) is massless and interact with electrons, protons, and neutrons. Neutrinos (ν, leptons) have no charge but there is some experimental evidence that neutrinos may have a small mass. Neutrinos interact via the weak nuclear force – a ...
... molecules is generally referred to as baryonic matter. The photon (γ) is massless and interact with electrons, protons, and neutrons. Neutrinos (ν, leptons) have no charge but there is some experimental evidence that neutrinos may have a small mass. Neutrinos interact via the weak nuclear force – a ...
Review of "Man`s Place in Nature" by Alfred Russel Wallace
... three times that of the next higher. Now if this rate of increase be continued down to the seventeenth magnitude there will be about 1,400,000,000 visible. In the best modern telescopes, telescopic observation and photographic charts show nothing approaching this number. The latest estimate does no ...
... three times that of the next higher. Now if this rate of increase be continued down to the seventeenth magnitude there will be about 1,400,000,000 visible. In the best modern telescopes, telescopic observation and photographic charts show nothing approaching this number. The latest estimate does no ...
OUR EARTH AND UNIVERSE --- WHERE WE LIVE (by Charles
... there are 60 seconds in a minute and 3,600 seconds in an hour. There are one million seconds in 12 days. There are one billion seconds in about 33 years. Our Earth rotates around a medium size star that we name the Sun. Our sun is 93 million miles for earth. Our moon was most likely formed when a gi ...
... there are 60 seconds in a minute and 3,600 seconds in an hour. There are one million seconds in 12 days. There are one billion seconds in about 33 years. Our Earth rotates around a medium size star that we name the Sun. Our sun is 93 million miles for earth. Our moon was most likely formed when a gi ...
origins of the Universe
... begin to contract and close in on itself eventually exploding again and starting the process all over again. ...
... begin to contract and close in on itself eventually exploding again and starting the process all over again. ...
Cosmology
... Describe and explain asteroids and meteorites and that these usually vaporize on entering the Earth’s atmosphere. Binary stars- most stars are part of a binary system and rotate around their common centre of mass. The Big Bang Discuss cosmic background radiation and its discovery. Talk about the sig ...
... Describe and explain asteroids and meteorites and that these usually vaporize on entering the Earth’s atmosphere. Binary stars- most stars are part of a binary system and rotate around their common centre of mass. The Big Bang Discuss cosmic background radiation and its discovery. Talk about the sig ...
Nineteenth lecture
... The nebulae gradually collapse and commonly start rotating, to form galaxies, like the Andromeda Galaxy, pictured here. (Note the other galaxies also in the picture!) ...
... The nebulae gradually collapse and commonly start rotating, to form galaxies, like the Andromeda Galaxy, pictured here. (Note the other galaxies also in the picture!) ...
doc
... If a visible light source is receding fast enough from an observer, its energy may be shifted into this part of the spectrum. -> Infrared (or radio) --- Or, just to redder wavelengths in the visible if it's not moving so fast. ...
... If a visible light source is receding fast enough from an observer, its energy may be shifted into this part of the spectrum. -> Infrared (or radio) --- Or, just to redder wavelengths in the visible if it's not moving so fast. ...
The New Cosmology: Our Expanding Universe
... takes for its light to reach us, and the further we look back into the Past Light Cone. What happens in our present, we cannot know; we cannot know what space is on the so-called Hyper-Surface of the Present. Relative to the Future Light Cone of an object, we are in the Elsewhere; only as time passe ...
... takes for its light to reach us, and the further we look back into the Past Light Cone. What happens in our present, we cannot know; we cannot know what space is on the so-called Hyper-Surface of the Present. Relative to the Future Light Cone of an object, we are in the Elsewhere; only as time passe ...
The New Cosmology: Our Expanding Universe
... takes for its light to reach us, and the further we look back into the Past Light Cone. What happens in our present, we cannot know; we cannot know what space is on the so-called Hyper-Surface of the Present. Relative to the Future Light Cone of an object, we are in the Elsewhere; only as time passe ...
... takes for its light to reach us, and the further we look back into the Past Light Cone. What happens in our present, we cannot know; we cannot know what space is on the so-called Hyper-Surface of the Present. Relative to the Future Light Cone of an object, we are in the Elsewhere; only as time passe ...
physics_cosmic_engine - HSC Guru
... 1. The speed of the orbiting planet increases as its radius decreases, and the speed decreases as the radius increases. 2. The time a planet takes to orbit is dependent of the radius of the orbit. T = period (time for 1 orbit) R = radius of orbit Galilei was the first person to look at the stars and ...
... 1. The speed of the orbiting planet increases as its radius decreases, and the speed decreases as the radius increases. 2. The time a planet takes to orbit is dependent of the radius of the orbit. T = period (time for 1 orbit) R = radius of orbit Galilei was the first person to look at the stars and ...
Historical overview
... in the distant universe, the Hubble flow velocity becomes large and peculiar velocities are insignificant in comparison; therefore “redshift” is often used to indicate the distance of an object rather than quoting it in Mpc ...
... in the distant universe, the Hubble flow velocity becomes large and peculiar velocities are insignificant in comparison; therefore “redshift” is often used to indicate the distance of an object rather than quoting it in Mpc ...
PDF - Florida State University
... There are a wide range of objects out there, including planets, stars and galaxies Next time we will start learning how these objects move around relative to each other This class can be one of the most interesting courses you take at FSU ...
... There are a wide range of objects out there, including planets, stars and galaxies Next time we will start learning how these objects move around relative to each other This class can be one of the most interesting courses you take at FSU ...
Big Bang
... Before Planck Time • Before a time classified as a Planck time, all of the four fundamental forces are presumed to have been unified into one force. • All matter, energy, space and time are presumed to have exploded outward from the original singularity. • Nothing is known of this period. ...
... Before Planck Time • Before a time classified as a Planck time, all of the four fundamental forces are presumed to have been unified into one force. • All matter, energy, space and time are presumed to have exploded outward from the original singularity. • Nothing is known of this period. ...
Galileo and Newton
... The Ptolemaic (a) and Copernican (b) systems both assumed that all orbits are circular. The fundamental difference is that Copernicus placed the Sun at the center. ...
... The Ptolemaic (a) and Copernican (b) systems both assumed that all orbits are circular. The fundamental difference is that Copernicus placed the Sun at the center. ...
The Universe - staff.harrisonburg.k12.va
... the earth outside our atmosphere. • It provides us with many of the images we have of space. • It is an especially useful telescope because it does not have to view things through our atmosphere ...
... the earth outside our atmosphere. • It provides us with many of the images we have of space. • It is an especially useful telescope because it does not have to view things through our atmosphere ...
The Universe
... the earth outside our atmosphere. • It provides us with many of the images we have of space. • It is an especially useful telescope because it does not have to view things through our atmosphere ...
... the earth outside our atmosphere. • It provides us with many of the images we have of space. • It is an especially useful telescope because it does not have to view things through our atmosphere ...
Slide 1
... the Big Bang theory. For example, we tend to imagine a giant explosion. Experts however say that there was no explosion; there was (and continues to be) an expansion. Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon exp ...
... the Big Bang theory. For example, we tend to imagine a giant explosion. Experts however say that there was no explosion; there was (and continues to be) an expansion. Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon exp ...
Document
... The universe is twice as big as thought : Two Types of Cepheids! During the wartime blackouts in California, Walter Baade used 200” Hale telescope and discovered two different populations of stars in Andromeda There are two types of Cepheids, with two different ...
... The universe is twice as big as thought : Two Types of Cepheids! During the wartime blackouts in California, Walter Baade used 200” Hale telescope and discovered two different populations of stars in Andromeda There are two types of Cepheids, with two different ...
Document
... Every direction you point ends on a tree Therefore, every direction is tree-bark brown ...
... Every direction you point ends on a tree Therefore, every direction is tree-bark brown ...
Class 28, 27 July
... – A little later, the protons and neutrons make Helium (most Helium in the universe was formed in the first 3 minutes after the Big Bang) – Nuclei, electrons, and photons in big “soup” • Nuclei try to collapse (gravity), photons push back (pressure) • This leads to OSCILLATIONS! • Size of oscillatio ...
... – A little later, the protons and neutrons make Helium (most Helium in the universe was formed in the first 3 minutes after the Big Bang) – Nuclei, electrons, and photons in big “soup” • Nuclei try to collapse (gravity), photons push back (pressure) • This leads to OSCILLATIONS! • Size of oscillatio ...
Lecture 1 Coordinate Systems - Department of Physics & Astronomy
... My Gravitational Field Equation’s Predict that the Universe has existed forever, is infinitely large and uniformly filled with stars with an average Spacing of l light year ...
... My Gravitational Field Equation’s Predict that the Universe has existed forever, is infinitely large and uniformly filled with stars with an average Spacing of l light year ...
Ch. 26.5 - (www.ramsey.k12.nj.us).
... Dark Matter = Does not give off radiation & cannot be detected Exerts gravitational force on visible matter Universe may be 90% + dark matter 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 du ...
... Dark Matter = Does not give off radiation & cannot be detected Exerts gravitational force on visible matter Universe may be 90% + dark matter 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 du ...
Universe
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.