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- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/24%3A_Black_Holes_and_Curved_Spacetime/24.03%3A_Tests_of_General_RelativityIn weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predict...In weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predictions that differ from Newtonian physics and can be tested. For example, general relativity predicts that light or radio waves will be deflected when they pass near the Sun, and that the position where Mercury is at perihelion would change by 43 arcsec per century even if there were no other planets
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/12%3A_The_Death_of_Stars/12.09%3A_Tests_of_General_RelativityIn weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predict...In weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predictions that differ from Newtonian physics and can be tested.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Big_Ideas_in_Cosmology_(Coble_et_al.)/12%3A_Gravitational_Lenses/12.03%3A_Lensing_by_Extended_Mass_DistributionsYou will understand that galaxies and clusters of galaxies can act as gravitational lenses. You will understand that many astrophysical lenses are complex in nature. You will understand that lensing s...You will understand that galaxies and clusters of galaxies can act as gravitational lenses. You will understand that many astrophysical lenses are complex in nature. You will understand that lensing suggests that most of the mass of galaxies and galaxy clusters is dark. You will understand that lensing provides an independent and distinct prediction of dark matter than does star , gas or galaxy motions based upon Newtonian dynamics.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/24%3A_Black_Holes_and_Curved_Spacetime/24.04%3A_Tests_of_General_RelativityIn weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predict...In weak gravitational fields, the predictions of general relativity agree with the predictions of Newton’s law of gravity. However, in the stronger gravity of the Sun, general relativity makes predictions that differ from Newtonian physics and can be tested. For example, general relativity predicts that light or radio waves will be deflected when they pass near the Sun, and that the position where Mercury is at perihelion would change by 43 arcsec per century even if there were no other planets
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/34%3A_Frontiers_of_Physics/34.02%3A_General_Relativity_and_Quantum_GravityWe know from "Special Relativity" that relativity is the study of how different observers measure the same event, particularly if they move relative to one another. Einstein’s theory of general relati...We know from "Special Relativity" that relativity is the study of how different observers measure the same event, particularly if they move relative to one another. Einstein’s theory of general relativity describes all types of relative motion including accelerated motion and the effects of gravity. General relativity encompasses special relativity and classical relativity in situations where acceleration is zero and relative velocity is small compared with the speed of light.
- https://phys.libretexts.org/Courses/Skidmore_College/Introduction_to_General_Relativity/04%3A_Light_Orbits/4.03%3A_LensingWhen a photon passes a massive object, the path of the photon is deflected. The photon may be deflected and collide with the massive object (or fall into the singularity), or the photon may "swing aro...When a photon passes a massive object, the path of the photon is deflected. The photon may be deflected and collide with the massive object (or fall into the singularity), or the photon may "swing around" the massive object (possibly multiple times) and escape. In the last section, we discussed a method to get qualitative information about the path. In this section, we will look at how to get quantitative information about the light path under very specific conditions.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Big_Ideas_in_Cosmology_(Coble_et_al.)/12%3A_Gravitational_Lenses/12.02%3A_Lensing_by_Point_MassesYou will understand how the lensing effect depends on the relative positions of the source, lens and observer and understand that the mass of the lens can be determined using gravitational lensing. Yo...You will understand how the lensing effect depends on the relative positions of the source, lens and observer and understand that the mass of the lens can be determined using gravitational lensing. You will understand that objects such as dim stars, brown dwarfs, and stellar remnants (white dwarfs, neutron stars, black holes) can act as gravitational lenses - collectively called MACHOs.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/11%3A_Particle_Physics_and_Cosmology/11.08%3A_Evolution_of_the_Early_UniverseThe early universe was hot and dense. The universe is isotropic and expanding. Cosmic background radiation is evidence for the Big Bang. The vast portion of the mass and energy of the universe is not ...The early universe was hot and dense. The universe is isotropic and expanding. Cosmic background radiation is evidence for the Big Bang. The vast portion of the mass and energy of the universe is not well understood.
- https://phys.libretexts.org/Courses/Chicago_State_University/PH_S_1150%3A_Basic_Astronomy/12%3A_Gravitational_Lenses/12.03%3A_Lensing_by_Extended_Mass_DistributionsYou will understand that galaxies and clusters of galaxies can act as gravitational lenses. You will understand that many astrophysical lenses are complex in nature. You will understand that lensing s...You will understand that galaxies and clusters of galaxies can act as gravitational lenses. You will understand that many astrophysical lenses are complex in nature. You will understand that lensing suggests that most of the mass of galaxies and galaxy clusters is dark. You will understand that lensing provides an independent and distinct prediction of dark matter than does star , gas or galaxy motions based upon Newtonian dynamics.
- https://phys.libretexts.org/Courses/Chicago_State_University/PH_S_1150%3A_Basic_Astronomy/12%3A_Gravitational_Lenses/12.02%3A_Lensing_by_Point_MassesYou will understand how the lensing effect depends on the relative positions of the source, lens and observer and understand that the mass of the lens can be determined using gravitational lensing. Yo...You will understand how the lensing effect depends on the relative positions of the source, lens and observer and understand that the mass of the lens can be determined using gravitational lensing. You will understand that objects such as dim stars, brown dwarfs, and stellar remnants (white dwarfs, neutron stars, black holes) can act as gravitational lenses - collectively called MACHOs.
