Thanks for your great question! Light is a very
interesting and unique thing that we all
experience every day. You are right to think that
light has no mass, and light also does not have a
volume in the same way that "normal" objects (like
a pencil, cup or person) do.
Light is a form of (electromagnetic) radiation,
which is a way of saying that light does belong in
a class of its own! Radiation also includes other
"things" that we experience every day like radio
waves, microwaves, and x-ray waves. All of these
things have a couple of characteristics in common:
• Radiation (like light) has no mass, but still
• Radiation carries energy (that's why sunlight
warms you up when you stand in it, or microwaves
cook food) In some ways it is appropriate to think
of radiation as "made" of energy.
• Radiation travels at light speed in a vacuum
(like outer space). Nothing can travel faster than
I know that light can be kind of tricky to think
about - many scientists (myself included)
certainly think so! - but I hope that I have been
able to answer some of your questions. Please send
along any other questions you have in mind!
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