Stars and Galaxies - Lunar and Planetary Institute
... Dominant scientific theory about the origin of the universe Occurred ~13.7 billion years ago ...
... Dominant scientific theory about the origin of the universe Occurred ~13.7 billion years ago ...
PRESENTAION
... density of the universe is less than the "critical density" which is proportional to the square of the Hubble constant, then the universe will expand forever. If the density of the universe is greater than the "critical density", then gravity will eventually win and the universe will collapse back o ...
... density of the universe is less than the "critical density" which is proportional to the square of the Hubble constant, then the universe will expand forever. If the density of the universe is greater than the "critical density", then gravity will eventually win and the universe will collapse back o ...
A fascinating tour of the cosmos — from Earth orbit.
... Carolyn Collins Petersen and Mark C. Petersen Narrated by Wren Ross ...
... Carolyn Collins Petersen and Mark C. Petersen Narrated by Wren Ross ...
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... body, the amount of surface area of the body and the surface temperature of the body. The body that emits the greatest amount of energy is a so called black body. Using Planck's Black Body Curve as a guide Dicke theorized that the Cosmic Background Radiation of the Big Bang should be about 3° above ...
... body, the amount of surface area of the body and the surface temperature of the body. The body that emits the greatest amount of energy is a so called black body. Using Planck's Black Body Curve as a guide Dicke theorized that the Cosmic Background Radiation of the Big Bang should be about 3° above ...
Day-5
... We need to handle great distances and long times. We can do this through the travel time of light. Light travels 300,000 km every second. We often use times to denote distances. For example, we may say a friend’s house is two hours away. Astronomy is a time machine! ...
... We need to handle great distances and long times. We can do this through the travel time of light. Light travels 300,000 km every second. We often use times to denote distances. For example, we may say a friend’s house is two hours away. Astronomy is a time machine! ...
universe - Global Change
... home to a variety of exotic objects. For example, quasars, which were first discovered in 1960, are still baffling objects. Incredibly energetic, they are found at great distances near what is thought to be the edge of the known universe (the most distant one has been estimated to be 10 billion ligh ...
... home to a variety of exotic objects. For example, quasars, which were first discovered in 1960, are still baffling objects. Incredibly energetic, they are found at great distances near what is thought to be the edge of the known universe (the most distant one has been estimated to be 10 billion ligh ...
Class notes 2 - University of Texas Astronomy
... The parsec (1 pc) is the distance at which 1 AU subtends an angle of 1 arcsec: 1 pc≅ 2 × 105 AU ≅ 3 × 1013km ≅ 3 light years Nearest star (at ~ 1.3 pc): Proxima Centauri, currently the nearest member of the ...
... The parsec (1 pc) is the distance at which 1 AU subtends an angle of 1 arcsec: 1 pc≅ 2 × 105 AU ≅ 3 × 1013km ≅ 3 light years Nearest star (at ~ 1.3 pc): Proxima Centauri, currently the nearest member of the ...
Cosmology Notes
... Speed/distance = Hubble’s constant 1/Hubble’s constant = Age of universe The first calculated age was 1.8 billion years, but we know now that this was way off- 13.7 billion years is the accepted value. ...
... Speed/distance = Hubble’s constant 1/Hubble’s constant = Age of universe The first calculated age was 1.8 billion years, but we know now that this was way off- 13.7 billion years is the accepted value. ...
What A Long Strange Trip It`s Been
... Do you understand how old the Earth is compared to the recent arrival of humans on Earth? For example if we compress the age of the Earth (4.6 billion years old) into one hour with the Earth’s crust first forming at 4.6 billion years ago then the earliest humans (Homo sapiens) appear on a one hour c ...
... Do you understand how old the Earth is compared to the recent arrival of humans on Earth? For example if we compress the age of the Earth (4.6 billion years old) into one hour with the Earth’s crust first forming at 4.6 billion years ago then the earliest humans (Homo sapiens) appear on a one hour c ...
Chapter 1 Our Place in the Universe
... A great island of stars in space, all held together by gravity and orbiting a common center ...
... A great island of stars in space, all held together by gravity and orbiting a common center ...
2. Velocity dispersions of galaxies
... 8. Anomalous orbital-energy changes during spacecraft flyby of earth ...
... 8. Anomalous orbital-energy changes during spacecraft flyby of earth ...
Cosmology - 2015 - johndistefano.com.au
... the universe was filled with a dense, hot quark–gluon plasma, containing quarks, leptons and their antiparticles. Page | The period when quarks became confined within hadrons – protons and neutrons- is known as the hadron 2 epoch. It started approximately 10−6 seconds after the Big Bang. Solitary ne ...
... the universe was filled with a dense, hot quark–gluon plasma, containing quarks, leptons and their antiparticles. Page | The period when quarks became confined within hadrons – protons and neutrons- is known as the hadron 2 epoch. It started approximately 10−6 seconds after the Big Bang. Solitary ne ...
Two prevailing theories on how the universe was created
... was stealing a million dollars from his vault. He caught the thief and turned him into the police, then when the owner found out he thanked the guard and fired him. Why? ...
... was stealing a million dollars from his vault. He caught the thief and turned him into the police, then when the owner found out he thanked the guard and fired him. Why? ...
pptx
... The Hubble Law Edwin Hubble measured distances to Slipher’s galaxies. He found that galaxies with higher velocities away from us (higher redshifts) have larger distances from us. This correlation between distance and velocity is known as the Hubble Law. ...
... The Hubble Law Edwin Hubble measured distances to Slipher’s galaxies. He found that galaxies with higher velocities away from us (higher redshifts) have larger distances from us. This correlation between distance and velocity is known as the Hubble Law. ...
Exploring the Helium Reionization Era
... nearby, about 2 billion light-years away, and found in the constellation Hercules. Studying such nearby quasars should clarify their role in ionizing the helium in the universe some 11.5 billion years ago. ...
... nearby, about 2 billion light-years away, and found in the constellation Hercules. Studying such nearby quasars should clarify their role in ionizing the helium in the universe some 11.5 billion years ago. ...
Sunday March 5th
... What makes arms? – Best theory = the Density Wave Theory- they are like sound waves/shock waves traveling through the disk – O and B stars live their short lives before the wave passes (so we see the brightest stars – BUT what starts the waves? How do you get ...
... What makes arms? – Best theory = the Density Wave Theory- they are like sound waves/shock waves traveling through the disk – O and B stars live their short lives before the wave passes (so we see the brightest stars – BUT what starts the waves? How do you get ...
The human race has made great strides in the last few centuries
... smooth, expanding ball of fully-ionized hydrogen and helium with photons rattling around in thermal equilibrium. Then, quite rapidly, when the temperature had dropped all the way to about 4000K, the electrons combined with the protons to create the first hydrogen atoms. But H atoms are transparent t ...
... smooth, expanding ball of fully-ionized hydrogen and helium with photons rattling around in thermal equilibrium. Then, quite rapidly, when the temperature had dropped all the way to about 4000K, the electrons combined with the protons to create the first hydrogen atoms. But H atoms are transparent t ...
1 - UCSC Physics - University of California, Santa Cruz
... some of the most bizarre predictions of general relativity. The two pulsars in the J0737-3039 system are actually very far apart compared to their sizes. In a true scale model, if the pulsars were the sizes of marbles, they would be about 750 feet (225 meters) apart. Albert Einstein's 90-year-old ge ...
... some of the most bizarre predictions of general relativity. The two pulsars in the J0737-3039 system are actually very far apart compared to their sizes. In a true scale model, if the pulsars were the sizes of marbles, they would be about 750 feet (225 meters) apart. Albert Einstein's 90-year-old ge ...
Practice Questions for Final
... According to the Big Bang theory, why do we live in a universe that is made of matter rather than antimatter? A. The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real. B. Einstein's famous equation E = mc2 tells us that energy ...
... According to the Big Bang theory, why do we live in a universe that is made of matter rather than antimatter? A. The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real. B. Einstein's famous equation E = mc2 tells us that energy ...
Institute`s Colloquium, by invitation - ICE-CSIC
... • The intuitive reason why de Sitter inflation cannot be past eternal is that in dS space exponential inflation is always preceded by an exponential contraction ...
... • The intuitive reason why de Sitter inflation cannot be past eternal is that in dS space exponential inflation is always preceded by an exponential contraction ...
The Universe had (probably) an origin: on the theorem of Borde
... • The intuitive reason why de Sitter inflation cannot be past eternal is that in dS space exponential inflation is always preceded by an exponential contraction ...
... • The intuitive reason why de Sitter inflation cannot be past eternal is that in dS space exponential inflation is always preceded by an exponential contraction ...
Chpt17-18
... been expanding since the Big Bang then we can invert the equation for Hubble’s law and calculate how long it has been since the Big Bang. Time since Big Bang = 1/Ho gives 14 billion years ...
... been expanding since the Big Bang then we can invert the equation for Hubble’s law and calculate how long it has been since the Big Bang. Time since Big Bang = 1/Ho gives 14 billion years ...
Slide 1
... 100,000 light years Millions of light years 10s of million light years 100 million light years ...
... 100,000 light years Millions of light years 10s of million light years 100 million light years ...
Astrophysics Outline—Option E
... E.3.12 Solve problems involving stellar distances, apparent brightness and luminosity. Cepheid variables E.3.13 Outline the nature of a Cepheid variable E.3.14 State the relationship between period and absolute magnitude for Cepheid variables E.3.15 Explain hoe Cepheid variables may be used as “stan ...
... E.3.12 Solve problems involving stellar distances, apparent brightness and luminosity. Cepheid variables E.3.13 Outline the nature of a Cepheid variable E.3.14 State the relationship between period and absolute magnitude for Cepheid variables E.3.15 Explain hoe Cepheid variables may be used as “stan ...
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.