The photons are affected because the gravitational field affects space-time. Therefore, the photons are responding to the shape of space-time rather than the gravity itself.
The photons in question i suppose are coming from stars and that means they are traveling through space and space is a clear medium. When light travels through a medium it's frequency is lowered and its direction changes. If you were referring to the 1919 eclipse, the stars behind the sun that became visible was due to the suns coronal medium that their light passed through. It was an optical illusion. gravity guru.
Gravity deforms spacetime, and photons follow the curves in spacetime that are put there by objects with large mass (and, therefore, large gravity).
No, they don't. They "curve" around massive objects, but this is a function of the photon following the "bend" in spacetime that objects with massive gravity create. Photons have a mass equal to zero.
"greater mass"
Gravity has no effect on mass, and mass has no effect on gravity. The characteristic behavior of gravity is that the force between two masses is directly proportional to the product of the masses, so if one or both masses were to increase, the mutual gravitational forces between them would increase in proportion to the increase in the product. That happens regardless of what the starting or ending mass happens to be, because mass has no effect on gravity.
Gravity is a force and its effect on a mass is measured in newtons.
Gravity will bend (influence) the path of photons (light). This effect is minimal: you would need A LOT of mass (like a black hole or a neutron star) and a very long distance for the photon to travel and to be measured to notice this effect. It is a little strange, as photons are considered to be massless, and should not be influenced by the mass (gravity) of another object. 1. Photons have energy; energy is mass (more or less); mass is affected by gravity. 2. Photons are probably affected by gravity, but you have to worry about refraction of light about a star. So, I think, the total angle is not due to gravity alone. Of course, maybe refraction is a gravity thing?
Gravity deforms spacetime, and photons follow the curves in spacetime that are put there by objects with large mass (and, therefore, large gravity).
No problem. Without mass, gravity has no effect anyway.
No, they don't. They "curve" around massive objects, but this is a function of the photon following the "bend" in spacetime that objects with massive gravity create. Photons have a mass equal to zero.
Gravity affects everything that has mass.
Weight.
Sagging is one measure of the effect gravity has upon a mass. This can be observed visually, as gravity is constantly pulling everything, including us, down.
weight is the effect of gravity acting on mass,the greater the mass the greater the effect on gravity will have on it therefore the greater the weight. eg. if the mass is 50kg and gravity is 10N the the weight is 500N,if the mass increases to 100kg the the weight would increase to 1000N
"greater mass"
Gravity has no effect on mass, and mass has no effect on gravity. The characteristic behavior of gravity is that the force between two masses is directly proportional to the product of the masses, so if one or both masses were to increase, the mutual gravitational forces between them would increase in proportion to the increase in the product. That happens regardless of what the starting or ending mass happens to be, because mass has no effect on gravity.
Gravity is a force and its effect on a mass is measured in newtons.
weight is the effect of gravity acting on mass,the greater the mass the greater the effect on gravity will have on it therefore the greater the weight. eg. if the mass is 50kg and gravity is 10N the the weight is 500N,if the mass increases to 100kg the the weight would increase to 1000N