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How can massless particles (even when at rest) combine together to form objects that have mass?

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I was reading this- https://en.wikipedia.org/wiki/Matter and in the first paragraph I got across the line stating - "... massless particles may be composed to form objects that have mass (even when at rest)."

From another Wikipedia article I got to knew that there are only two massless particles viz. photon and gluon. So, how is this feasible that many photons/gluons can be compsoed to form object that have mass? Is it through the pair production from the energy that photon carries or is it something else? Can pair production like thing happen with gluons too?

Closed as per community consensus as the post is not graduate-level

asked Feb 7, 2017 in Closed Questions by AnkitChabarwal [ no revision ]
recategorized Feb 8, 2017 by Dilaton

Most voted comments show all comments

This is nonsense. Massless particles cannot be at rest. Wikipedia is not always reliable, as you can see from this manifestly wrong claim. For other wrong claims see my article
''Misconceptions about Virtual Particles''

commented Feb 7, 2017 by Arnold Neumaier (15,787 points) [ no revision ]

Oh my Gosh! PO becomes almost like Physics SE -- total laymen are here!

commented Feb 7, 2017 by Andrey Feldman (904 points) [ revision history ]
edited Feb 8, 2017 by Andrey Feldman

vote to close as not being graduate+ level

commented Feb 7, 2017 by Arnold Neumaier (15,787 points) [ no revision ]

You need to upvote the linked vote to close, not the comment!

commented Feb 8, 2017 by Arnold Neumaier (15,787 points) [ no revision ]

@Dilaton OK, then I will work harder on answering questions to get enough reputation.

commented Feb 8, 2017 by Andrey Feldman (904 points) [ revision history ]
edited Feb 8, 2017 by Andrey Feldman

Most recent comments show all comments

Sorry, no, it is not yet hidden, and one needs 500 rep to upvote a close vote.

commented Feb 8, 2017 by Arnold Neumaier (15,787 points) [ no revision ]

@AndreyFeldman you are highly cool ;-) !

The issue is that to see the closevote thread you need 500 rep, which in particular at quiet times sometimes gives us a hard time to gather the 3 closevotes needed to close a question

commented Feb 8, 2017 by Dilaton (6,240 points) [ no revision ]

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