so this speed of light thing? « Singletrack Forum

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so this speed of light thing?

54 posts & 29 voices | Started 5 months ago by racefaceec90 | Latest reply from yunki

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Junkyard - Member

Most of this stuff is just guesswork , we could all come up with some bullshit theory which could never be proven one way or another .

Let us know how your religion works out

Great if "theory" can actually be proven or disproved.
E.G . Here's my theory of life . I believe that every time we go to sleep we wake up as somebody else , we can't remember who we last were and can only recall aver having been the person we now are .
Care to prove or disprove ?

One of the principles of a scientific theory is that it must be testable so that is not a scientific theory..it does not explain what this happens [ so it is a description not a theory] and it does not predict [ who goes to who] so its still not a scientific theory

Why do people always think "theory" means spontaneous wild guess when it comes to science?

science [philosophy and underpinning principles] is not well understood by the lay person

Posted 5 months ago #
yunki - Member

Noooo...I'd been watching Dara O'Briain around the time of your post on the jellybox

if you'd watched it to the end you would have seen his big finale where him and jimi mistry act out an alternative ending where the Latinos have mutated.. and are heating up the earth..

Posted 5 months ago #
dogbert - Member

Posted 5 months ago #
buzz-lightyear - Member

Do photons have zero mass? But their path is affected by other large masses. There is a lovely lensing effect picture on here recently.

Posted 5 months ago #
rogerthecat - Member

It's all bunkum, this light speed thing.
If the light is the fastest thing in the universe, how come the darkness is always there before it?
Answer me that one pretty boy Cox.

Posted 5 months ago #
clarkpm4242 - Member

Do photons have zero mass? But their path is affected by other large masses. There is a lovely lensing effect picture on here recently.

The space-time through which the photons travel is warped by the mass. As far as the photon is 'concerned' it is still travelling in a straight line within that space-time reference frame...
...sort of.

Posted 5 months ago #
yunki - Member

how come the darkness is always there before it?

and dark is invisible.. so how come we can't see through it..?

Posted 5 months ago #
Junkyard - Member

It's all bunkum, this light speed thing.
If the light is the fastest thing in the universe, how come the darkness is always there before it?

Dark is the absence of light [ the universe with no energy left in it so to speak] Dark is not a property [ can you send some Dark to somewhere else?but you are being facetious arent you

I dont mean dark matter but no one knws what that is yet anway appart from the fact we cant see it

light is not necessarily the fastest thing in the universe - only sub light speed particles reaching faster than light is barred by special relativity. Particles at speeds always faster than light are not barred though they are still [iirc] theoretical tachyons???

Posted 5 months ago #
yunki - Member

Dark is the absence of light

Dark is the absence of reflected light technically.. cos light's invisible too innit...

(not that I'm a science boffin or anything.. I've just been reading a QI book I got for chrimbo..)

Posted 5 months ago #
richmtb - Member

Right boys and girls.

1. The speed of light is constant
2. Gravity does not have a speed, gravity is a force that results from the curvature of spacetime
3. The easiest way to think of a black hole is this - Escape velocity from the earths gravitation pull is around 12000m/s if the Earth was sufficiently massive that its escape velocity was greater than 300,000,000m/s (the speed of light) it would become a blackhole (planets like earth are nowhere near massive enough to ever form a blackhole though, super-dense remains of supernova or neutron stars are the normal candidates for blackholes.
4. Objects near a blackhole behave in the same way they would behave around any other object with a large gravitational pull for example if our sun was replaced with a blackhole of equal mass the orbits of the planets would not change (although there would be less sunny days) Blackholes do not have special gravitational powers beyond what is expected for an object of their mass.
5. The event horizon is the boundary at which all paths lead to the blackhole. Outside the boundary of the event horizon light (and information) can still move away from the black hole. Inside the event horizon all particle,s objects and radiation can only move towards the blackhole so no light or information about an event can pass back outside (hence the name "Event Horizon")

Posted 5 months ago #
CharlieMungus - Member

2. Gravity does not have a speed, gravity is a force that results from the curvature of spacetime

So, if a mass suddenly appeared , how lonh would it take for a body at a distnce from that mass to be subject to the gravitatioanl field the 'new' mass created?

Posted 5 months ago #
clarkpm4242 - Member

So, if a mass suddenly appeared , how lonh would it take for a body at a distnce from that mass to be subject to the gravitatioanl field the 'new' mass created?

The impact of the new mass on space-time propagates at the cosmic speed limit (also the speed of light).

Posted 5 months ago #
AdamW - Member

Isn't it time for *someone* to say "big bang bollocks" yet?

Posted 5 months ago #
Surrounded By Zulus - Member

I dont think anyone knows much about space at all, let alone how it was created.

Posted 5 months ago #
Junkyard - Member

ah right in cue here he is

Posted 5 months ago #
Surrounded By Zulus - Member

There was an interesting Horizon programme on a few weeks back which suggested just that.

Posted 5 months ago #
Junkyard - Member

looks you have told some tall tales on here but there was never a horizon programme about your trolling

Posted 5 months ago #
clarkpm4242 - Member

I dont think anyone knows much about space at all, let alone how it was created.

SBZ does have a point though. The origin of the low entropy, organised early universe is one of the big questions in science.

This is where valid theory can stray across into conjecture and leave scientists that are not careful in how they present such discussions open to trolling, naysayers and sensationalism.

Cheers...

Posted 5 months ago #
yunki - Member

Right boys and girls.

1. The speed of light is constant in a vacuum

FTFY

Posted 5 months ago #