![Presentation available here - Lunar and Planetary Institute](http://s1.studyres.com/store/data/008081532_1-74e307d4e980f1f8d94733e3d9cc946d-300x300.png)
Presentation available here - Lunar and Planetary Institute
... One of the greatest challenges to astrophysics now is to understand the nature of the Dark Energy that drives the acceleration. The dark energy is probably a field (like a magnetic field, but different), but it is 120 orders of magnitude smaller than physicists would expect. No current theory of phy ...
... One of the greatest challenges to astrophysics now is to understand the nature of the Dark Energy that drives the acceleration. The dark energy is probably a field (like a magnetic field, but different), but it is 120 orders of magnitude smaller than physicists would expect. No current theory of phy ...
IOSR Journal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861.
... expanding is not slowing, as most cosmologists had thought, but is accelerating instead. It is estimated that three quarters of the universe is made up of dark energy while dark matter accounts for another 23% and baryonic or ordinary matter and energy occupy only 2%.Therefore dark energy is hardly ...
... expanding is not slowing, as most cosmologists had thought, but is accelerating instead. It is estimated that three quarters of the universe is made up of dark energy while dark matter accounts for another 23% and baryonic or ordinary matter and energy occupy only 2%.Therefore dark energy is hardly ...
12.4 Notes
... energy. Label the rollercoaster to show where the car has the greatest and least amount of potential and ...
... energy. Label the rollercoaster to show where the car has the greatest and least amount of potential and ...
Orbital Paths
... orbits can’t change spontaneously An object can’t crash into a planet unless its orbit takes it there. An orbit can only change if it gains/loses energy from another object, such as a gravitational encounter: ...
... orbits can’t change spontaneously An object can’t crash into a planet unless its orbit takes it there. An orbit can only change if it gains/loses energy from another object, such as a gravitational encounter: ...
PHYSICS COURSE SYLLABUS Lucy C. Laney High School School
... SP1. Students will analyze the relationships between force, mass, gravity, and the motion of objects. a. Calculate average velocity, instantaneous velocity, and acceleration in a given frame of reference. b. Compare and contrast scalar and vector quantities. c. Compare graphically and algebraically ...
... SP1. Students will analyze the relationships between force, mass, gravity, and the motion of objects. a. Calculate average velocity, instantaneous velocity, and acceleration in a given frame of reference. b. Compare and contrast scalar and vector quantities. c. Compare graphically and algebraically ...
Unit 1
... • In the 1700’s, Charles Messier was observing comets, and kept finding objects that while fuzzy, were not comets – He made a list (or catalog) of these undesired objects, so he could avoid seeing them – They became known as Messier Objects, a number preceded by an M. – M31 (the Andromeda galaxy) is ...
... • In the 1700’s, Charles Messier was observing comets, and kept finding objects that while fuzzy, were not comets – He made a list (or catalog) of these undesired objects, so he could avoid seeing them – They became known as Messier Objects, a number preceded by an M. – M31 (the Andromeda galaxy) is ...
Mysteries of Space
... • The mass discovered by scientists for this galaxy used the estimated mass to estimate the speed of various stars movement and discovered that they are moving much faster than predicted. The way scientists have explained this phenomenon is that there must be 90 times more matter that is not visible ...
... • The mass discovered by scientists for this galaxy used the estimated mass to estimate the speed of various stars movement and discovered that they are moving much faster than predicted. The way scientists have explained this phenomenon is that there must be 90 times more matter that is not visible ...
Ay 1 – Final Exam
... c) Comparing these two numbers, do you expect the cosmological constant to have a significant effect on the motion of planets within the Solar System? ...
... c) Comparing these two numbers, do you expect the cosmological constant to have a significant effect on the motion of planets within the Solar System? ...
Is space created and destroyed? 9 Feb 16 Feb 2012
... A WD and giant orbit each other. Mass moves from the giant to the WD. WD explodes when it gets so much mass from the giant that degeneracy pressure can no longer oppose gravity. è Type I supernovae are approximately “standard candles.” They have the same luminosity. è How to find supernovae Look at ...
... A WD and giant orbit each other. Mass moves from the giant to the WD. WD explodes when it gets so much mass from the giant that degeneracy pressure can no longer oppose gravity. è Type I supernovae are approximately “standard candles.” They have the same luminosity. è How to find supernovae Look at ...
Type Ia supernovae and the ESSENCE supernova survey
... SN data combined with data from baryon acoustic oscillations (BAO) give M + = 1 at the 68 percent confidence level. ...
... SN data combined with data from baryon acoustic oscillations (BAO) give M + = 1 at the 68 percent confidence level. ...
Reviewing concepts covered this year Looking Back
... ____ 3. Factor in an experiment that can be manipulated by the experimenter. ____ 4. Factor in an experiment that can change if other factors are changed. ____ 5. After careful observation and applying background knowledge, ______ are formed by the observer. ____ 6. Standard for comparison that show ...
... ____ 3. Factor in an experiment that can be manipulated by the experimenter. ____ 4. Factor in an experiment that can change if other factors are changed. ____ 5. After careful observation and applying background knowledge, ______ are formed by the observer. ____ 6. Standard for comparison that show ...
Document
... For how long might we expect such an X-ray binary source to shine?... Suppose we could completely annihilate a source of, say, ...
... For how long might we expect such an X-ray binary source to shine?... Suppose we could completely annihilate a source of, say, ...
Monday, December 8 - Otterbein University
... Daily Rising and Setting • Due to the rotation of the Earth around its axis • Period of rotation: 1 siderial day= 23h56m4.1s • 1 solar day (Noon to Noon) =24h • Stars rotate around the ...
... Daily Rising and Setting • Due to the rotation of the Earth around its axis • Period of rotation: 1 siderial day= 23h56m4.1s • 1 solar day (Noon to Noon) =24h • Stars rotate around the ...
Ch. 26.5 - (www.ramsey.k12.nj.us).
... Dark Matter = Does not give off radiation & cannot be detected Exerts gravitational force on visible matter Universe may be 90% + dark matter Why do we think Dark Matter exists? Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration du ...
... Dark Matter = Does not give off radiation & cannot be detected Exerts gravitational force on visible matter Universe may be 90% + dark matter Why do we think Dark Matter exists? Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration du ...
Chemical Energy
... Vocabulary List and Definitions 1. Attracting – To draw by a physical force causing or tending to cause to approach, adhere, or unite; pull. 2. Chemical Energy – Energy which is stored within the bonds of atoms and molecules of a a. substance. Released when they are broken and the substance undergoe ...
... Vocabulary List and Definitions 1. Attracting – To draw by a physical force causing or tending to cause to approach, adhere, or unite; pull. 2. Chemical Energy – Energy which is stored within the bonds of atoms and molecules of a a. substance. Released when they are broken and the substance undergoe ...
Here
... • Every point of light you see is another galaxy filled with 100s of billions of stars. ...
... • Every point of light you see is another galaxy filled with 100s of billions of stars. ...
Big Bang PPT
... the objects near the very edge of the universe are the oldest objects in the universe. The most distant known objects in ...
... the objects near the very edge of the universe are the oldest objects in the universe. The most distant known objects in ...
Galaxies and the Universe
... shaped like spheres or eggs; have almost no dust or gas between stars; contain old stars ...
... shaped like spheres or eggs; have almost no dust or gas between stars; contain old stars ...
Work and Energy
... (a) the weight of the box; (b) the potential energy lost by the box; (c) the kinetic energy gained by the box; (d) the work done against friction; (e) the size of the frictional force. Assume that the frictional force is constant and that no energy is lost in any other form. 7 A boy of mass 50 kg ru ...
... (a) the weight of the box; (b) the potential energy lost by the box; (c) the kinetic energy gained by the box; (d) the work done against friction; (e) the size of the frictional force. Assume that the frictional force is constant and that no energy is lost in any other form. 7 A boy of mass 50 kg ru ...
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.