Recent content by sten

if you sum the red-shifted energy received by the solar cells your total would be less than the star's output as measured near its surface. where did the rest of the energy go?

If the outside "bubble" is unaware if a star exists in its center and only uses energy measurements to verify the existence of such a star then the conclusion is that no energy is output and therefore no star is present (it could be black hole if gravity can be measured). So to an observer...

My own take on this experiment's interpretation is that the energy was not "lost", it was used to "fuel" the expansion (therefore the accelerating rate). That would mean dark energy is not that dark in its origin and that we'd never see it. Even further - energy and space will have to be...

Here's a thought experiment with a few questions: Space expands, probably at accelerating rate. We can make a thought experiment like this: there's a star surrounded by billions of light-years of empty space (say 4300 Mpc radius, well beyond the size of what we see - it's a thought...

I don't think "definition" is enough - it would be hard to redefine the math of space-time geometry by just changing the definition. It's a nice coincidence that we can, but you can't just pick anything laying around and say "hey, this will be my straight line". The reason I asked this question...

I wouldn't have expected this question is a hard one, plenty of smart and educated people around here

Why is light traveling in "straight" line? (see restrictions) Here's a question: Why is light traveling in "straight" line? Of course there will be those of you to jump on the question and say it's not a well defined one and they'd be right. For that purpose I'll restrict the question a...

Can you please point me to some of those explanations? Much appreciated!

Still... I'm not asking for evidence, I'm sure they are the same value. I'm not questioning GR either - I'm only pointing out that such a fact lies in the core of it. What I'm looking for is "why" are they the same value.

Gravitational mass is the property of objects that determines how they interact via gravity. For example how the Moon rotates around Earth. Inertial mass is an object's property that determines how much the object "resists" acceleration when force is applied to it. And it seems both are...