Riddle: What is the only thing that you can see but has no mass??
100574
There's more than one: light, a hole, darkness, and shadows to name a few.  Also a hallucination.\n\n*Yankeesrock26ws, air actually does have mass, it's just that it's effectively constant on Earth so we tend not to notice it.\n\nhandsome_stranger wrote:\n>>>actually light can be changed to mass so i think it is not a good >>>answer\nBut then it's not light anymore.
1057846
Nothing but a theory to explain the unexplainable.  All known matter relfects light, radiation, energy.
843279
the word is 'nothing'\n\n=)
1166211
I do not know you that well yet...............\n\n\nHow about a physics question or something challenging?
1136316
There are no such things like nothing. Nothing is a human defentition of emptyness. Existence of nothing is already existence of something. The smallest part we know something like proton and photon but that what we know. I am sure there are even smaller parts that in time will discover.
670367
Unidentified flying object.
758301
light (photon) has no mass... but with is super super great speed, there is an associated kinetic energy (moving) and also momentum (continuously moving)..\nrecall that KE and momentum require mass but with light, no mass....\nuse relativistic equations for relativistic speeds...
1124878
It is all throughout space if it exists.  You can't see it because...well...it is dark ;0)
1180646
take what? I don't see anything
279317
gravity.\n\nany shape of mass that is not spherical is gravitationally unstable
326995
How would you lose mass?  By Newton, the mass must not change.  By Einstein, the mass slightly inscreases.
1091336
Things would weigh less than on earth\n\nst
948538
depends if ur looking in a microscope some what big if u looking at it from your eyes to ur hand invisible and it is in ur body.. wen i look at pictures they look like the size of a marble
217070
Nothing is nothing. Energy is something.\n\nIf there is nothing in a universe then is it even a universe?  No, it is not, it's nothing.
604389
Light doesn't have a rest mass, that is an inherent mass that it would have it it were at rest relative to you, but it does have a mass equivalence due to its energy. \n\nE=MC^2 gives the relationship between mass and energy, so you can rearrange this to M=E/C^2 to find the mass equivalence of a given amount of light.  The energy of light can be calculated a number of ways, and then this number can be plugged into the mass-energy equation.  Needless to say, it takes a whole lot of light to add up to a significant amount of mass.\n\nEdit:  Sorry, Mathematician, you're incorrect.  Light does have mass and it can be calculated using the mass energy equivalence.  Your argument is basically circular since you're using the definition of light not having a *rest*\n mass to say that it has no momentum, and the statement that it has no momentum to claim that it therefore has no mass.  You're right in that it has no rest mass, but that's not the only kind of mass there is.  If you've ever seen a radiometer work you've seen direct evidence of the momentum of light.
973015
Unidentified Flying object\n\nusually "aliens"!
554379
light.\n\nlet me refer you to e=mc2...light has mass energy and inertia.\na light is a wave and a particle.\nIt is in motion, and objects in motion have inertia and thusly power.\n\nThe true absence of light would exist in a vacuum. There is no pwer in a true vacuum. Even if the absence of light was "massive", that word you chose is a relative term, which is to say that massive CAN NOT imply mass, inertia, etc. The absence of light is NOT measurable because there is nothing there to exist.