Apparently light does matter

[Beerball]

http://www.theregister.co.uk/2014/05/19/photon_collider_light_into_matter/

[Keukasmallies]

Thanks for shedding some light on this matter.

[Ted William's frozen head]

Thanks for shedding some light on this matter.

Now if they can make Antimatter,and figure out a way to contain it, you would have the fuel to power a (potentially) light speed Star ship.

[Pete]

one of the most mindblowing documentaries I have ever seen

http://topdocumentaryfilms.com/light-darkness-colors/