Is the law of gravitational attraction only applicable to matter, not energy? i mean light is energy why does?

Question

it respond to gravity if it does no have mass?

Answer 1

Under Einstein's interpretation, gravitational attraction applies to both matter and energy (also, matter and energy are the same thing anyway).

Einstein saw gravity not as a "force," but as a geometrical effect. Spacetime takes on a "curved shape" near a massive body (like a planet); and therefore anything that travels near that body will go in a curved path as it follows the curve of spacetime. That applies both to rocks and to light beams.

Answer 2

According to general relativity, space time curves in the presence of a massive body. The gravitational force is a manifestation of that curvature. Light is the propagation of an EM wave through space time. Therefore, it is also affected by space time curvature. A beam of light traveling in a straight path through a curved space will appear to bend.This is known as gravitational lensing and can be observed during a solar eclipse.

Heres another way to look at it:
Another implication of general relativity is the equivalence of mass and energy through the famous equation: E=mc^2. So if gravity applies to one it must apply to both.

Just for the reference: Photons have a zero rest mass but a nonzero relativistic mass.

Answer 3

any amount of energy is constantly forming and destroying pairs of particles (matter and antimatter) so that for extremely small amounts of time, there does exist some amount of mass related to that energy but its for so small an amount of time that we can never actually observe it.

at least this is one possible explanation. i dont think we have a good answer for that question yet :)