chapter 28 pages 747-752
... • 3. Once it is hot enough for H to fuse into He, main sequence stage occurs • This is the longest stage of a stars life. • 4. In medium sized stars, once all H has been fused into He, He then starts to fuse into C during the Red Giant stage ...
... • 3. Once it is hot enough for H to fuse into He, main sequence stage occurs • This is the longest stage of a stars life. • 4. In medium sized stars, once all H has been fused into He, He then starts to fuse into C during the Red Giant stage ...
The Observable Universe: Redshift, Distances and the Hubble-Law
... • Most of galaxies and all Quasars have redshifted Spectra (cosmological redshift, not gravitational). • Hubble found: cz = H0 d , z < 0,1. • The Hubble Constant has to be calibrated: Cepheids and SN-Methods are nowadays the most important Distance Indicators: H0 = 72+/-5 km/s/Mpc. • Hubble-Law can ...
... • Most of galaxies and all Quasars have redshifted Spectra (cosmological redshift, not gravitational). • Hubble found: cz = H0 d , z < 0,1. • The Hubble Constant has to be calibrated: Cepheids and SN-Methods are nowadays the most important Distance Indicators: H0 = 72+/-5 km/s/Mpc. • Hubble-Law can ...
The Solar System - Astronomy - The University of Texas at Austin
... attracting each other in the Local Group. (They will eventually collide in 10 billion years.) • If one gets out of the Local Group, then it appears that all other galaxies move away from us --evidence for the expansion of the Universe. – Does it mean we are the center of the Universe? If not, why no ...
... attracting each other in the Local Group. (They will eventually collide in 10 billion years.) • If one gets out of the Local Group, then it appears that all other galaxies move away from us --evidence for the expansion of the Universe. – Does it mean we are the center of the Universe? If not, why no ...
Day-5
... The elements of life are widespread. The same physical laws operate throughout. The Cosmological Principle There's nothing special about Earth ...
... The elements of life are widespread. The same physical laws operate throughout. The Cosmological Principle There's nothing special about Earth ...
Document
... “Precisely when we grasp the vastness of the universe we also grasp an equally vast interior, the enormous geography of the soul, so to speak. Words may fail afterward, forcing us to rely on hackneyed descriptions that emphasize our insignificance, but what we actually sense, if only for an instant ...
... “Precisely when we grasp the vastness of the universe we also grasp an equally vast interior, the enormous geography of the soul, so to speak. Words may fail afterward, forcing us to rely on hackneyed descriptions that emphasize our insignificance, but what we actually sense, if only for an instant ...
Chapter105.ppt
... • Planets are made from planetesimals; originally the rings of gas and dusk surrounding a protostar. The Moon formed when another celestial body collided with the Earth to create a massive cloud of dust and debris that coalesced to form the Moon. ...
... • Planets are made from planetesimals; originally the rings of gas and dusk surrounding a protostar. The Moon formed when another celestial body collided with the Earth to create a massive cloud of dust and debris that coalesced to form the Moon. ...
Lecture20 - University of Waterloo
... At this distance, the light we are seeing was emitted when the Universe was only a third of its present age. ...
... At this distance, the light we are seeing was emitted when the Universe was only a third of its present age. ...
File - AMS02 BOLOGNA
... This striking symmetry would naturally lead us to conclude that the Universe contains particles and antiparticles in equal number densities. The observed Universe is drastically different. We do not observe any bodies of antimatter within the solar system and only antiprotons in the cosmic rays, whi ...
... This striking symmetry would naturally lead us to conclude that the Universe contains particles and antiparticles in equal number densities. The observed Universe is drastically different. We do not observe any bodies of antimatter within the solar system and only antiprotons in the cosmic rays, whi ...
Scientific Models and a Comprehensive Picture of
... This presentation is inspired by the ideas of Karl Popper and Hermann Bondi. The expectation from a cosmological model is that it makes testable predictions about the real universe. This restriction rules out concepts of parallel universe, for example. If a claim is made that our universe has a para ...
... This presentation is inspired by the ideas of Karl Popper and Hermann Bondi. The expectation from a cosmological model is that it makes testable predictions about the real universe. This restriction rules out concepts of parallel universe, for example. If a claim is made that our universe has a para ...
Astronomy
... 10-15 billion years old (Earth is 4.6 billion years old) Where do we think the universe came from/how did it form? ...
... 10-15 billion years old (Earth is 4.6 billion years old) Where do we think the universe came from/how did it form? ...
Multiple choice test questions 2, Winter Semester
... 16) What is a standard candle? A) an object for which we are likely to know its true luminosity B) an object for which we can easily measure its apparent brightness C) a class of objects that we know all have exactly the same luminosity D) any star for which we know its exact apparent brightness E) ...
... 16) What is a standard candle? A) an object for which we are likely to know its true luminosity B) an object for which we can easily measure its apparent brightness C) a class of objects that we know all have exactly the same luminosity D) any star for which we know its exact apparent brightness E) ...
0708 - Astronomy
... What does it mean that distance and velocity are proportional? balloon is stretched (multiplicatively) by some factor we need to think of the Universe the same way Can we trace the expansion back to the point where it began? that “point” is now the whole balloon/whole Universe... so no. ...
... What does it mean that distance and velocity are proportional? balloon is stretched (multiplicatively) by some factor we need to think of the Universe the same way Can we trace the expansion back to the point where it began? that “point” is now the whole balloon/whole Universe... so no. ...
Flat
... In flat space, the shortest distance between two points is a straight line. In the presence of gravity, light follows a curved line. ...
... In flat space, the shortest distance between two points is a straight line. In the presence of gravity, light follows a curved line. ...
Earth Science Regents Review Jeopardy
... A child calculates the mass of a rock to be 100 grams, when it actual weighs 105. What was the students percent deviation? ...
... A child calculates the mass of a rock to be 100 grams, when it actual weighs 105. What was the students percent deviation? ...
Grade 11 Cosmology PPT File
... slope of the Hubble Law Graph. Slope = Velocity/Distance (Hubble Constant) The inverse of the Hubble Constant then has the dimension of time, and can be taken as an estimate of the age of the Universe! The Hubble Constant has been found to be between 50 and 100 km/s per kiloparsec. The Universe has ...
... slope of the Hubble Law Graph. Slope = Velocity/Distance (Hubble Constant) The inverse of the Hubble Constant then has the dimension of time, and can be taken as an estimate of the age of the Universe! The Hubble Constant has been found to be between 50 and 100 km/s per kiloparsec. The Universe has ...
Chapter 1 Our Place in the Universe
... • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
... • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
Astronomy- The Original Science
... •In 1687, Isaac Newton showed that all objects in the universe attract each other through gravitational force. •The force of gravity depends on the mass of the objects and the distance between them. •Newton’s law of gravity explained why all of the planets orbit the most massive object in the solar ...
... •In 1687, Isaac Newton showed that all objects in the universe attract each other through gravitational force. •The force of gravity depends on the mass of the objects and the distance between them. •Newton’s law of gravity explained why all of the planets orbit the most massive object in the solar ...
THE BIG BANG - Santa Cruz Institute for Particle Physics
... director of the Hayden Planetarium, had invited five "distinguished" cosmologists into his lair for a roasting disguised as a debate about the Big Bang. It was part of series in honor of the late and prolific author Isaac Asimov (540 books written or edited). What turned out to be at issue was less ...
... director of the Hayden Planetarium, had invited five "distinguished" cosmologists into his lair for a roasting disguised as a debate about the Big Bang. It was part of series in honor of the late and prolific author Isaac Asimov (540 books written or edited). What turned out to be at issue was less ...
Universal redshift, the Hubble constant The cosmic background
... When the temperature dropped below 3000 K, some 5 ∗ 105 years after the Big–Bang ...
... When the temperature dropped below 3000 K, some 5 ∗ 105 years after the Big–Bang ...
Astronomy Honors Mid term Study Guide
... Directions: Do not re-write each question. Number and write the answer to each question on lose leaf. Only hand written notes will be permitted for use on the mid term exam and will collected at the end of the test. Disclaimer: Below you will find a list of questions and vocabulary terms that pertai ...
... Directions: Do not re-write each question. Number and write the answer to each question on lose leaf. Only hand written notes will be permitted for use on the mid term exam and will collected at the end of the test. Disclaimer: Below you will find a list of questions and vocabulary terms that pertai ...
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.