Powerpoint for today
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
mass of star
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
From Rubber Bands to Big Bangs
... From Rubber Bands to Big Bangs The Universe has been expanding for almost 14 billion years from a smaller, hotter, denser form to its present cooler, larger, and less dense form. You might ask, “What is expanding, and how do we know that?” The Cosmic Microwave Background Radiation (CMB) is scientifi ...
... From Rubber Bands to Big Bangs The Universe has been expanding for almost 14 billion years from a smaller, hotter, denser form to its present cooler, larger, and less dense form. You might ask, “What is expanding, and how do we know that?” The Cosmic Microwave Background Radiation (CMB) is scientifi ...
Dr.Sinha - Indico
... in the past and hence it was much denser and hotter. In the early universe matter existed in the form of fundamental particles. ...
... in the past and hence it was much denser and hotter. In the early universe matter existed in the form of fundamental particles. ...
From Rubber Bands to Big Bangs The Universe has been
... From Rubber Bands to Big Bangs The Universe has been expanding for almost 14 billion years from a smaller, hotter, denser form to its present cooler, larger, and less dense form. You might ask, “What is expanding, and how do we know that?” The Cosmic Microwave Background Radiation (CMB) is scientifi ...
... From Rubber Bands to Big Bangs The Universe has been expanding for almost 14 billion years from a smaller, hotter, denser form to its present cooler, larger, and less dense form. You might ask, “What is expanding, and how do we know that?” The Cosmic Microwave Background Radiation (CMB) is scientifi ...
Problem Set # 8: The Last Problem Set Due Wednesday, December
... 3) [20 points] The temperature of the cosmic background light today is T ≈ 2.7 K. At the time of Big Bang Nucleosynthesis, the temperature of the cosmic background light was T ≈ 5 × 108 K. What was the scale factor a at the time of Big Bang Nucleosynthesis? If the density of ordinary matter today i ...
... 3) [20 points] The temperature of the cosmic background light today is T ≈ 2.7 K. At the time of Big Bang Nucleosynthesis, the temperature of the cosmic background light was T ≈ 5 × 108 K. What was the scale factor a at the time of Big Bang Nucleosynthesis? If the density of ordinary matter today i ...
Multiple choice test questions 2, Winter Semester
... B) the cosmic background radiation and the expansion of the universe C) the cosmic background radiation and the near-critical density of the universe D) the predominance of matter over antimatter and the near-critical density of the universe E) the predominance of matter over antimatter and the larg ...
... B) the cosmic background radiation and the expansion of the universe C) the cosmic background radiation and the near-critical density of the universe D) the predominance of matter over antimatter and the near-critical density of the universe E) the predominance of matter over antimatter and the larg ...
Slides from fourth lecture
... most times • We live at a special time in the history of the universe – anti-Copernican ...
... most times • We live at a special time in the history of the universe – anti-Copernican ...
Part II, page 129 (instructions on page 127)
... • How do distance measurements tell us the age of the universe? • Combining distance measurements with velocity measurements tells us Hubble’s constant, and the inverse of Hubble’s constant tells us how long it would have taken the universe to reach its present size if the expansion rate had ne ...
... • How do distance measurements tell us the age of the universe? • Combining distance measurements with velocity measurements tells us Hubble’s constant, and the inverse of Hubble’s constant tells us how long it would have taken the universe to reach its present size if the expansion rate had ne ...
25 centuries ago, the ancients came up with theories such as:
... How can black holes be detected? a) We listen for them b) We detect their gravitational effects on other stars c) We can see them through telescopes d) We can’t Why do scientists believe in the Big Bang theory over others? a) Because sound travels slower than light so we can still hear it. b) They c ...
... How can black holes be detected? a) We listen for them b) We detect their gravitational effects on other stars c) We can see them through telescopes d) We can’t Why do scientists believe in the Big Bang theory over others? a) Because sound travels slower than light so we can still hear it. b) They c ...
Lecture 29 - Empyrean Quest Publishers
... Globular clusters orbit galactic center, sun 2/3rds way out. He used proper motions of Cepheids-->Distance (11 stars). Shapley-Curtis debate 1920--Nebulae are within our island universe (Shapley). Nebulae may be other galaxies (Curtis). Edwin Hubble 1923--distance to Andromeda galaxy found from Ceph ...
... Globular clusters orbit galactic center, sun 2/3rds way out. He used proper motions of Cepheids-->Distance (11 stars). Shapley-Curtis debate 1920--Nebulae are within our island universe (Shapley). Nebulae may be other galaxies (Curtis). Edwin Hubble 1923--distance to Andromeda galaxy found from Ceph ...
static universe - St John Brebeuf
... This motivation evaporated after the discovery by Edwin Hubble that the universe is in fact not static, but expanding; in particular, Hubble discovered a relationship between redshift and distance, which forms the basis for the modern expansion paradigm. According to Gamow this led Einstein to decla ...
... This motivation evaporated after the discovery by Edwin Hubble that the universe is in fact not static, but expanding; in particular, Hubble discovered a relationship between redshift and distance, which forms the basis for the modern expansion paradigm. According to Gamow this led Einstein to decla ...
Higher Physics Content Statements
... Measurements of the velocities of galaxies and their distance from us lead to the theory of the expanding Universe. Gravity is the force which slows down the expansion. The eventual fate of the Universe depends on its mass. The orbital speed of the Sun and other stars gives a way of determining the ...
... Measurements of the velocities of galaxies and their distance from us lead to the theory of the expanding Universe. Gravity is the force which slows down the expansion. The eventual fate of the Universe depends on its mass. The orbital speed of the Sun and other stars gives a way of determining the ...
TheExpansionoftheUniverse
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
1)2 A light year is a) about six trillion miles. b) the distance to the star
... a) heat within the Earth that is left over from formation and created by radioactive decay. b) heat from the sun being absorbed by the surface. c) the moon's tidal forces. 11)2 Evidence from Type I A supernovae indicates that a) our galaxy is expanding b) the local group of galaxies is expanding c) ...
... a) heat within the Earth that is left over from formation and created by radioactive decay. b) heat from the sun being absorbed by the surface. c) the moon's tidal forces. 11)2 Evidence from Type I A supernovae indicates that a) our galaxy is expanding b) the local group of galaxies is expanding c) ...
CMC The Universe – Pics of the day 1. Neutron Star A Neutron Star
... A black hole is formed when a massive star collapse in its cycle life. Then ...
... A black hole is formed when a massive star collapse in its cycle life. Then ...
Science Implications of Various Servicing Options
... The High Redshift Universe • Redshifts above ~6-7 are largely unexplored because they require a large field of view and high sensitivity at infrared wavelengths. ...
... The High Redshift Universe • Redshifts above ~6-7 are largely unexplored because they require a large field of view and high sensitivity at infrared wavelengths. ...
The Solar System - Astronomy - The University of Texas at Austin
... ~2,400km; however, Pluto (and Sedna) itself may be just a bigger version of the KBOs. • The peculiarity of Pluto can be seen from its orbit around the Sun: while the other planet‘s orbits are nearly circular, Pluto’s is highly elongated, arguing for a different formation process for Pluto. ...
... ~2,400km; however, Pluto (and Sedna) itself may be just a bigger version of the KBOs. • The peculiarity of Pluto can be seen from its orbit around the Sun: while the other planet‘s orbits are nearly circular, Pluto’s is highly elongated, arguing for a different formation process for Pluto. ...
Unit 1
... bang: Within the first second after the Big Bang gravity came into existence The universe then expanded rapidly and became flooded with subatomic particles that slammed into one another, forming protons and neutrons. Three minutes later, the temperature was 500 billion degrees Fahrenheit. Protons an ...
... bang: Within the first second after the Big Bang gravity came into existence The universe then expanded rapidly and became flooded with subatomic particles that slammed into one another, forming protons and neutrons. Three minutes later, the temperature was 500 billion degrees Fahrenheit. Protons an ...
Our Universe
... Where did the Big Bang occur in the Universe? • Space and time were created in the Big Bang. At the beginning of the universe, the space was completely filled with matter. • The matter was originally very hot and very dense and then expanded and cooled to eventually produce the stars and galaxies w ...
... Where did the Big Bang occur in the Universe? • Space and time were created in the Big Bang. At the beginning of the universe, the space was completely filled with matter. • The matter was originally very hot and very dense and then expanded and cooled to eventually produce the stars and galaxies w ...
U7 Review WS KEY
... c. galactic clusters b. cosmic background radiation d. abundance of light elements (H, He and Li) The first elements that were formed in the universe were? a. hydrogen and lithium c. hydrogen and helium b. lithium and helium d. lithium and beryllium 10. I can describe tools and models used by scie ...
... c. galactic clusters b. cosmic background radiation d. abundance of light elements (H, He and Li) The first elements that were formed in the universe were? a. hydrogen and lithium c. hydrogen and helium b. lithium and helium d. lithium and beryllium 10. I can describe tools and models used by scie ...
Position in Solar System ppt
... The Universe contains billions of galaxies, each containing millions or billions of stars. Therefore, the galaxy in which our solar system and essentially all of us live, is just one of ...
... The Universe contains billions of galaxies, each containing millions or billions of stars. Therefore, the galaxy in which our solar system and essentially all of us live, is just one of ...
Ch 20 Notes Stars
... • When a scientist observes a galaxy that is 1 billion years away, they are observing light that left the galaxy 1 billion years ago • Scientists don’t know what the galaxy looks like now, but can study similar closer galaxies to piece together the evolution of galaxies • The gas, dust and stars tha ...
... • When a scientist observes a galaxy that is 1 billion years away, they are observing light that left the galaxy 1 billion years ago • Scientists don’t know what the galaxy looks like now, but can study similar closer galaxies to piece together the evolution of galaxies • The gas, dust and stars tha ...
word document - FacStaff Home Page for CBU
... _____a) We appear to be orbiting the center of the Milky Way galaxy with a speed of about 500,000 mph (about means within a factor of 5). _____b) The Andromeda galaxy is a galaxy very much like our own and is about 2 million light years away from us. _____c) A REGULAR cluster of galaxies has THOUSAN ...
... _____a) We appear to be orbiting the center of the Milky Way galaxy with a speed of about 500,000 mph (about means within a factor of 5). _____b) The Andromeda galaxy is a galaxy very much like our own and is about 2 million light years away from us. _____c) A REGULAR cluster of galaxies has THOUSAN ...
valenica_2014_planetarium2
... Some imagination is needed, since this was made for a planetarium dome. Squashing the dome of course leads to distortions that are not seen in the planetarium dome. ...
... Some imagination is needed, since this was made for a planetarium dome. Squashing the dome of course leads to distortions that are not seen in the planetarium dome. ...
Big Bang
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background, large scale structure, and Hubble's Law. If the known laws of physics are extrapolated beyond where they are valid, there is a singularity. Modern measurements place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies.Since Georges Lemaître first noted, in 1927, that an expanding universe might be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, accumulated empirical evidence provides strong support for the former. In 1929, from analysis of galactic redshifts, Edwin Hubble concluded that galaxies are drifting apart, important observational evidence consistent with the hypothesis of an expanding universe. In 1965, the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model, since that theory predicted the existence of background radiation throughout the universe before it was discovered. More recently, measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to dark energy's existence. The known physical laws of nature can be used to calculate the characteristics of the universe in detail back in time to an initial state of extreme density and temperature.