Re: Questions (Space)

Tina Hall wrote:
Jonathan L Cunningham <spam@xxxxxxxxxxxxxxxxxxxx> wrote:
Tina Hall <Tina_Hall@xxxxxxxxxxx> wrote:
Jonathan L Cunningham <spam@xxxxxxxxxxxxxxxxxxxx> wrote:

But I don't mind if other people imagine them as tiny things
whizzing around.
Well, I'm looking for an image. Your fuzzy balls don't work for me.

As the actress...

?

Because I would think those particles are a lot smaller (and
certainly visible if that big). I mean, bowling balls whizzing
around _ougth_ to be noticed, even ones without weight. <g>
The bigger they are, the lighter they are. It's the small ones that
are heavy :-)
Only if they have the same weight. ;)

No really, they don't have mass, so how could they weigh anything.

Photons do have mass. A red photon weighs about
0.0000000000000000000000000000000028 grammes (2.8*10^-36 kg), and a
blue photon nearly double that.

They're said to have no mass. So where do they get the weight without mass?

Just noticed this. The following is really a note to Jonathan, so he can try and explain it to you if he wants. (I'm afraid I have no idea how I'd go about explaining photons to you. The people who are trying are a lot braver than I am ... )

Jonathan, people are talking about two different things called mass here. The "zero mass" is rest mass. It really is zero for photons. And it's Lorentz-invariant, so it's zero no matter how you look at it. The thing you're talking about is usually called "energy". (It's not Lorentz-invariant, so you change it just by going at a different velocity.)

Tim
.

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