Dark Matter Dark Energy The History of the Universe More of the
... 22% WIMPS) and 1% ordinary matter ...
... 22% WIMPS) and 1% ordinary matter ...
100 $100 $100 $100 $100 $100 $200 $200 $200 $200 $200 $200
... 22% WIMPS) and 1% ordinary matter ...
... 22% WIMPS) and 1% ordinary matter ...
The Big Bang Theory - Red Hook Central Schools
... • The speed of light is a universal constant of 300,000 km/s2 • We observe stars millions/billions of light-years away • A light-year is the distance that light travels in 1 year – the light we see today from a star 500 light years away is 500 years old • The furthest stars away are 10-15 billion li ...
... • The speed of light is a universal constant of 300,000 km/s2 • We observe stars millions/billions of light-years away • A light-year is the distance that light travels in 1 year – the light we see today from a star 500 light years away is 500 years old • The furthest stars away are 10-15 billion li ...
Class 28, 27 July
... • Nuclei try to collapse (gravity), photons push back (pressure) • This leads to OSCILLATIONS! • Size of oscillations measures geometry of universe (know physical size, angle, so can measure geometry) ...
... • Nuclei try to collapse (gravity), photons push back (pressure) • This leads to OSCILLATIONS! • Size of oscillations measures geometry of universe (know physical size, angle, so can measure geometry) ...
Which model predicts the youngest age for the universe today?
... measure distances discovered something quite strange ...
... measure distances discovered something quite strange ...
Homework 1 - Course Pages of Physics Department
... 3. Newtonian cosmology. Use Euclidean geometry and Newtonian gravity, so that we interpret the expansion of the universe as an actual motion of galaxies instead of an expansion of space itself. Consider thus a spherical group of galaxies in otherwise empty space. At a sufficiently large scale you ca ...
... 3. Newtonian cosmology. Use Euclidean geometry and Newtonian gravity, so that we interpret the expansion of the universe as an actual motion of galaxies instead of an expansion of space itself. Consider thus a spherical group of galaxies in otherwise empty space. At a sufficiently large scale you ca ...
Gravitational mass
... universe? Answer depends on average density critical density c = 10-26 kg / m3 ...
... universe? Answer depends on average density critical density c = 10-26 kg / m3 ...
PowerPoint Presentation - The Origin of the Universe
... – Start off with a binary star system – One star comes to end of its life – forms a “white dwarf” (made of helium, or carbon/oxygen) – White Dwarf starts to pull matter off other star… this adds to mass of white dwarf (accretion) – White dwarfs have a maximum possible mass… the ...
... – Start off with a binary star system – One star comes to end of its life – forms a “white dwarf” (made of helium, or carbon/oxygen) – White Dwarf starts to pull matter off other star… this adds to mass of white dwarf (accretion) – White dwarfs have a maximum possible mass… the ...
Dark Matter and Dark Energy
... • The existence of dark matter is inferred indirectly by its gravitational effect. • Inference from observations of – the motions of stars and gas in galaxies, cluster galaxy radial velocities, hot gas properties of clusters, and gravitational lensing of distant, background galaxies by foreground ga ...
... • The existence of dark matter is inferred indirectly by its gravitational effect. • Inference from observations of – the motions of stars and gas in galaxies, cluster galaxy radial velocities, hot gas properties of clusters, and gravitational lensing of distant, background galaxies by foreground ga ...
EXERCISES: Set 2 of 4 Q1: The absolute magnitude of the Sun in
... Q1: The absolute magnitude of the Sun in the optical V band is MV = 4.8. The brightness of the night sky at a dark astronomical site is 22 magnitudes per square arcsec in the V band. (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be a ...
... Q1: The absolute magnitude of the Sun in the optical V band is MV = 4.8. The brightness of the night sky at a dark astronomical site is 22 magnitudes per square arcsec in the V band. (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be a ...
The Big Bang
... Expansion of the Universe • In 1929 Edwin Hubble found link between distances to galaxies and their radial velocities • Plot Hubble's data ...
... Expansion of the Universe • In 1929 Edwin Hubble found link between distances to galaxies and their radial velocities • Plot Hubble's data ...
13800000000 Years Ago The First Sky
... What do they tell us ? Age of the Universe = 13800000000 Years Size of our Universe = 13800000000 Light Years = 100000000000000000000000 kilo-meters !!! ...
... What do they tell us ? Age of the Universe = 13800000000 Years Size of our Universe = 13800000000 Light Years = 100000000000000000000000 kilo-meters !!! ...
Dark energy
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.