2. -particle whose
invariant mass is
zero

3. Known to experience the same
gravitational acceleration as other
particles (which provides empirical
evidence for the equivalence
principle) because they do
have relativistic mass, which is
what acts as the gravity charge
moves in straight lines in
spacetime, called geodesics

4. Gluon
Graviton
Neutrinos
Photon

6.  carrier of
the strong force
 Particle that
carries the force
between quarks
 massless bosons
 mediate the
strong color force
between quarks

8. massless tensor bosons
A massless spin-2 particle
which is the hypothetical
quantum of the gravitational
field

9. A hypothetical elementary
particle associated with the
gravitational interaction
A stable particle with zero rest
mass, zero charge, and a spin
of ± 2, and travels with the
speed of light

11.  “Ghostly Particle”
 An electrically neutral, very weakly
interacting particle, with a rest energy
which is either zero or very small
 A stable particle with no charge, a rest
mass of zero, and a spin of 1/2, that
carries away energy in the course of
nuclear reactions
 Its main characteristic is the weakness of
its interactions with all other particles

13. carrier of electromagnetism
Smallest packet of the
electromagnetic force field
messenger particle of the
electromagnetic force
smallest bundle of light

14. mediate the electromagnetic force
between charged particles
can also adopt a mass for a short
period, in accordance with
Heisenberg's uncertainty principle
 A transverse wave of electric and
magnetic fields which can
propagate through empty space.

15.  Gluons
 Gravitons
 Neutrinos
 Photons
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