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Astronomy and Cosmology Exam Review
... 1) One light year is about 9.5x1012 Km 2) What does the red shift tell us about the motion of the universe? It is expanding 3) What is currently the most accepted theory about the origin of the universe called? Big Bang 4) What can I tell about a star based on its color? What elements are present 5) ...
... 1) One light year is about 9.5x1012 Km 2) What does the red shift tell us about the motion of the universe? It is expanding 3) What is currently the most accepted theory about the origin of the universe called? Big Bang 4) What can I tell about a star based on its color? What elements are present 5) ...
Light Energy, Dark Energy 1. Another View of Olber's Paradox
... long, long time ago there were no stars anywhere. However, it would be pretty darn weird for the universe to have sat around with no stars anywhere for an infinite amount of time... and then suddenly start producing them. It's also technically possible for something to increase forever without becom ...
... long, long time ago there were no stars anywhere. However, it would be pretty darn weird for the universe to have sat around with no stars anywhere for an infinite amount of time... and then suddenly start producing them. It's also technically possible for something to increase forever without becom ...
Matter and Its Changes (Chapter 1)
... Observation - qualitative (senses) and quantitative (measurement) of the properties of an object or system. Warning!: Since observation depends on what one already knows there is a possibility that you can “observe”, even if it does not happen. (Sometimes referred to as ‘wishful thinking”.) Remedy - ...
... Observation - qualitative (senses) and quantitative (measurement) of the properties of an object or system. Warning!: Since observation depends on what one already knows there is a possibility that you can “observe”, even if it does not happen. (Sometimes referred to as ‘wishful thinking”.) Remedy - ...
Our Place in the Cosmos
... outside our Galaxy and that these objects are receding from us at a speed proportional to their distance, the Hubble expansion ...
... outside our Galaxy and that these objects are receding from us at a speed proportional to their distance, the Hubble expansion ...
Concept map-Rubric-final - Berkeley Center for Cosmological
... work backwards from observations of the visible universe to ...
... work backwards from observations of the visible universe to ...
ASTRONOMY 2 — Overview of the Universe Fourth Practice
... (10) Shortly after the Big Bang, there was only one type of force in Nature, instead of the four types of forces we have today: Gravity, Electromagnetism, Strong Nuclear Force, and Weak Nuclear Force. T (11) Our Galaxy’s measured rotation velocity indicates that it contains a lot of dark matter. T ( ...
... (10) Shortly after the Big Bang, there was only one type of force in Nature, instead of the four types of forces we have today: Gravity, Electromagnetism, Strong Nuclear Force, and Weak Nuclear Force. T (11) Our Galaxy’s measured rotation velocity indicates that it contains a lot of dark matter. T ( ...
Our place in the Universe
... • Every point of light you see is another galaxy filled with 100s of billions of stars. • Except for….. ...
... • Every point of light you see is another galaxy filled with 100s of billions of stars. • Except for….. ...
Energy - ChemConnections
... •Neither are greenhouse gases. They do not absorb infrared radiation (heat). •However, H2O and CO2 can absorb infrared energy. Without them earth would be very chilly. ...
... •Neither are greenhouse gases. They do not absorb infrared radiation (heat). •However, H2O and CO2 can absorb infrared energy. Without them earth would be very chilly. ...
Spring 2013 Final Exam Study Guide
... 1. Name the 6 metric prefixes and list their numerical values ...
... 1. Name the 6 metric prefixes and list their numerical values ...
Paradigm Shifts in Cosmology
... of space. It should be verified based on an accurate law and Hubble s law is the very thing. It states that the velocity of expansion is proportional to the distance from us. Let s assume that the entirety of space expands uniformly independent of point and direction. The distance between any celest ...
... of space. It should be verified based on an accurate law and Hubble s law is the very thing. It states that the velocity of expansion is proportional to the distance from us. Let s assume that the entirety of space expands uniformly independent of point and direction. The distance between any celest ...
Dark matter
... dark matter, it doesn’t “clump up”). Since its energy density is so low everywhere, how do we know the dark energy’s there? ...
... dark matter, it doesn’t “clump up”). Since its energy density is so low everywhere, how do we know the dark energy’s there? ...
Origins of the Universe - Fraser Heights Chess Club
... 1. What happens to a spaceship that falls into a black hole? 2. Will the black holes in our Galaxy eventually suck up everything in it - a cosmic vacuum cleaner? 3. What would happen to Earth if the Sun was replaced by a black hole of the same mass? 4. If we can’t see black holes, how do we know the ...
... 1. What happens to a spaceship that falls into a black hole? 2. Will the black holes in our Galaxy eventually suck up everything in it - a cosmic vacuum cleaner? 3. What would happen to Earth if the Sun was replaced by a black hole of the same mass? 4. If we can’t see black holes, how do we know the ...
The cosmological constant puzzle: vacuum energies from QCD to
... – If yes, then count as matter contribution in Einstein‘s equations and not in the vacuum that couples to gravity – Likewise, if „Higgs condensates“ are confined in composite models Brodsky, Roberts, Shrock,Tandy ...
... – If yes, then count as matter contribution in Einstein‘s equations and not in the vacuum that couples to gravity – Likewise, if „Higgs condensates“ are confined in composite models Brodsky, Roberts, Shrock,Tandy ...
Document
... • The universe has grown from the size of an atom to larger than the size a grapefruit • E=mc2 • energy froze into matter according to Albert Einstein’s equation. • This basically says that like snowflakes freezing, energy forms matter into clumps that today we call protons, neutrons and electrons. ...
... • The universe has grown from the size of an atom to larger than the size a grapefruit • E=mc2 • energy froze into matter according to Albert Einstein’s equation. • This basically says that like snowflakes freezing, energy forms matter into clumps that today we call protons, neutrons and electrons. ...
Lecture 2
... very large scales and therefore that the universe should be in a state of collapse. We can try to argue that if it is uniform and infinite then there is no preferred direction for any object to move in so nothing happens. It is clear however that, at best, any such situation would be unstable – any ...
... very large scales and therefore that the universe should be in a state of collapse. We can try to argue that if it is uniform and infinite then there is no preferred direction for any object to move in so nothing happens. It is clear however that, at best, any such situation would be unstable – any ...
2014 Joseph E. Pesce, Ph.D. 1 Astro 113 Final Exam Review 1. What
... be 100 Mpc from the Milky Way Galaxy. According to Hubble's Law, how fast will we see this galaxy to be moving? 5. If you triple the distance from a light source, what happens to its bri ...
... be 100 Mpc from the Milky Way Galaxy. According to Hubble's Law, how fast will we see this galaxy to be moving? 5. If you triple the distance from a light source, what happens to its bri ...
Dark energy
![](https://commons.wikimedia.org/wiki/Special:FilePath/Dark_Energy.jpg?width=300)
In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate. Assuming that the standard model of cosmology is correct, the best current measurements indicate that dark energy contributes 68.3% of the total energy in the present-day observable universe. The mass–energy of dark matter and ordinary matter contribute 26.8% and 4.9%, respectively, and other components such as neutrinos and photons contribute a very small amount. Again on a mass–energy equivalence basis, the density of dark energy (6.91 × 10−27 kg/m3) is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it comes to dominate the mass–energy of the universe because it is uniform across space.Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously, and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space. Contributions from scalar fields that are constant in space are usually also included in the cosmological constant. The cosmological constant can be formulated to be equivalent to vacuum energy. Scalar fields that do change in space can be difficult to distinguish from a cosmological constant because the change may be extremely slow.High-precision measurements of the expansion of the universe are required to understand how the expansion rate changes over time and space. In general relativity, the evolution of the expansion rate is parameterized by the cosmological equation of state (the relationship between temperature, pressure, and combined matter, energy, and vacuum energy density for any region of space). Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.Adding the cosmological constant to cosmology's standard FLRW metric leads to the Lambda-CDM model, which has been referred to as the ""standard model of cosmology"" because of its precise agreement with observations. Dark energy has been used as a crucial ingredient in a recent attempt to formulate a cyclic model for the universe.