The True Nature of Matter and Mass | Space Time | PBS Digital Studios

Are matter, mass, and time real?

Tweet at us! @pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com

We know that mass is energy… but what is energy? And where did matter and time even come from? Matt begins to dive into these intricate topics by first examining what inertial mass is, how it relates to gravitational mass, and what it all means for mass as a fundamental property.

The Speed of Light is NOT About Light

The Real Meaning of E=mc²

______________________

COMMENTS:

Caleb Limb

Felix Feist

deathbypowerpoint
______________________

FURTHER READING:

Inertial Mass

Equivalence Principle
______________________

Written and hosted by Matt O’Dowd

[InternetReviewerGuy]

I don't understand 90% of these videos, but I watch every single one to boost their viewership so that they'll make more programming like this for people who do.

[lnhostetler]

I am a (first-year) PhD student in theoretical particle physics, and I learned something new watching this video. In fact, I basically had a 'Holy crap it all makes sense now!' moment.

I am lucky to be learning physics in a time when there is such high quality content as this available at my fingertips.

[hyperelliptik]

"Mass is an emergent property of the interactions of massless particles", wow. I'm just an amateur physics nerd but everything up to and including that quote was so incredibly well explained and visualized (although I had to watch it at 50% speed to keep up and not lose track because ADHD etc lol). One of the best physics channels on youtube, honestly. This is why I love physics, challenging the very universe itself to find answers to the things we take for granted, asking "but why" to every phenomenon until an answer is found, and there's no way to avoid dipping one's toes into existential philosophy at the same time.

[elck]

THIS ONE EPISODE should be given an Emmy. This is a masterpiece.

[Lucky]

This is the first time I've started to actually understand where mass comes from and why photons are massless. Thanks for this video!

[leavy]

This channel is one of the only places I know of where I can visit the comments and not worry about any trolling or saltiness, and actually learn something. Wish I could subscribe more than once!

[ComandanteJ]

I always have to watch SpaceTime vids a couple of times to get everything, but this time i think i will have to watch it even more than two, LOL.

[mergele]

I feel so vulnerable right now. Can we please go back to the days when atoms where still atomic and concrete and stuff and there and real?

[olbluelips]

I think this is one of your best videos I've watched so far. The analogy of the mirrored box is such a beautiful and intuitive way of explaining how mass arises from energy/massless particles.

[Fematika]

I am so glad that this channel exists. I clicked on a flat-earth video, and I just needed some actual science to cool my temper.

[isaiahbanta]

I cheered when I saw the notification of a new video from SpaceTime!

[cobeycobb]

I swear... my mind gets so blown every time I watch one of these. Amazing!

[khawajadotd]

now THIS is the type of content I love from this channel! Absolutely mind blowing stuff, guys. Great job!

[ASLUHLUHCE]

SPOILER ALERT
Mindblown. Mass and time are emergent properties of massless, timeless particles and fields bumping around, resisting acceleration.

[tomc.]

Four years later and this still blows my mind

[Lolerchop]

This is arguably the best physics channel on YouTube. I love how the explanations aren't drastically oversimplified. Keep em comin' PBS!

[xXDorianXx]

This science channel is best of all that i saw, better than kurzgesagt, scishow, minutearth and everything else, the explanations are so straight that even me who is more to biology and IT can understand it clearly. Thanks for it :P

[garethdean]

There have been points in my life where I have seen something that opens up an area of knowledge to me or changes my view of the universe. This is now one of them.

[PopeGoliath]

This is one of my favorite episodes for how mindblowing it is. What a revelation.

[abok]

These videos have helped me grapple with conceptualizing Physics on a whole different level.