Brian cox - what's so special about light? #science #astronomy #physics

brian cox a known astrophysicist talks what's special about light.

[artstuffandmore...]

Time travel is only possible if you misunderstood what time is.

[RobbTheHobb]

But what if an alien civilization has the power to mess with time. How would it effect the universe as a whole and ourselves

[nerys]

Why do people always falsely think that light speed or FTL results in time travel? It doesn't Even relativistic effects are not time travel not in this context as you approach the speed of light you exchange mass for time your mask goes up time goes down at the speed of light in theory time would stop for you but there's the key two words at the end of that sentence for you time doesn't stop just your time stops so even if going faster somehow reverses time I'm not sure how that would manifest for your body because it's not going to be your body reversing what it's done for the last few decades that's not how time travel works but even still it would be just for you the rest of the universe is still going on like it normally does

[davez]

Einstein had never said the speed of things with no mass. Speed of light was first measured by ole roemer

[jhwhthemerciful]

If they're massless how come thry curve when traveling along a black hole? I thought mass attracted mass?

[Bnryzombie]

If light is massless how can it push something?

[MarcLugo-]

Light must have mass to inter act with space time.

Photons can not cool to any element.

[jazjobse]

Wrong light is Not Massey's photons have ability to rotate a vane in vacuum

[simonfernandes]

I like the way this guy thinks! Hahah prevent your own birth😅

[MarcLugo-]

I know everything I need to know. Year to date.

You?

[jamesdavis]

Can I go back in time to June of 1945 & prevent the eventual destruction to the United States thats going on today?