Why Doesn't Light Have Mass?

Of all the things we can actually see (directly), we say light is the only one that doesn't have mass. Is this true? How is this possible if it has energy?
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VIDEO ANNOTATIONS

Why do the Planets orbit in a Plane?
https://youtu.be/qFJ14DZfKG4

What is Inertia?
https://youtu.be/lZhjyP3-lME

Relativity & Gravity Complete Series:
http://youtu.be/a205YJsbBSQ

Bonds Do NOT Have Energy!
http://youtu.be/g39nwNm0Xfw

Mass? Energy? What's The Difference?
http://youtu.be/2jKHM92wbl4

The "Vacuum" of Space:
http://youtu.be/iSe_R87kF6U

Recent Vlog:
https://youtu.be/OA1T-cTDPLE
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HUGE THANK YOU TO THESE PATRONS:

** Randy Hukle **
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EXTRA INFO LINKS

Related Veritasium Video:
https://youtu.be/n_yx_BrdRF8

Related MinutePhysics Video:
https://youtu.be/NnMIhxWRGNw

SciShow Space Video on Kugelblitz:
https://youtu.be/gNL1RN4eRR8

Hydrogen Fusion:
https://en.wikipedia.org/wiki/Proton%E2%80%93proton_chain_reaction
http://hyperphysics.phy-astr.gsu.edu/hbase/astro/procyc.html
http://www.physics.sfsu.edu/~chris/astro300/lectures/lect20.pdf

Particles:
https://en.wikipedia.org/wiki/Proton
https://en.wikipedia.org/wiki/Alpha_particle

Solar Luminosity:
https://en.wikipedia.org/wiki/Solar_luminosity

Mass Energy Equivalence:
https://en.wikipedia.org/wiki/Mass%E2%80%93energy_equivalence

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COMMENTS ABOUT LIGHT

ashley hughes:
https://www.youtube.com/watch?v=qFJ14DZfKG4&lc=z12gc5hbjpq2yxwck22vthdomlejtdw33

A. Shafey & Nga Nguyen:
https://www.youtube.com/watch?v=2jKHM92wbl4&lc=z13kjxap2vumzfo4204cjxpprozxvv5ryuo0k

Chock Thirtytwo:
https://www.youtube.com/watch?v=pY66Hg0wuCo&lc=z12uxdfhvyrvtvsos04cfblzdkubths5if4

Commisar Aecun:
https://www.youtube.com/watch?v=m2-UJAEJzcc&lc=z13ljvngnpqzz5zdz235hfwqmquzzpcku

Ira Sanborn:
https://www.youtube.com/watch?v=lZhjyP3-lME&lc=z120ibliavmhh5udj22bfbf5hq2mjvolv

JustAditya:
https://www.youtube.com/watch?v=Vmi_h5A8B2k&lc=z13pwfzjsqykg5byx04cjnabtkeldrwyg3k

Required Taste:
https://www.youtube.com/watch?v=Vmi_h5A8B2k&lc=z12tijrxjnzcgla2i22duj0xuyvoflhfn

sudharsan vj:
https://www.youtube.com/watch?v=Sute9QjIRGA&lc=z13wep3gdnzpwvpeb235irgqclzmdbot1

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COMMENT RESPONSES

Scaling - Jesse LaJeunesse:
https://www.youtube.com/watch?v=qFJ14DZfKG4&lc=z12qvnmgfy3ofxj4404cflmqfu2zulraeis

Sun's Magnetic Field - nunya bisnass:
https://www.youtube.com/watch?v=qFJ14DZfKG4&lc=z12owlczdwz0wrcrs04cg3yx2y3xsbxg0g4

Gravity from Where? - Amy Soderstrom:
https://www.youtube.com/watch?v=qFJ14DZfKG4&lc=z13hspjwllnmxxuuq23eibygdqnvgpfyf04

Other Star Systems - K8UR Channel:
https://www.youtube.com/watch?v=qFJ14DZfKG4&lc=z123tdlywry2dzinh23wyxnqsqjbwxd4a04

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