> Intra-system panspermia is an interesting and seemingly credible idea

another interesting idea is that our Sun is not hot enough to produce any elements heavier than iron, meaning that trace elements in you and I are of extra-solar system origin

I would have assumed all of the material in the solar system didn't come from our sun?

Other than what's been blown off the sun as solar wind.

I mean, Earth didn't originate from material from the stella explosion of Sol.

All of the material in the Solar System - sun and planets - formed from the same original cloud of atoms. This cloud itself included atoms generated by earlier generations of stars. The different elemental composition of the Sun and planets was partly driven by the physics of processes operating as the system matured.

The sun is a second generation star, that is it formed out of earlier stars who did make those heavier elements.

indeed, and humans are a material part of Earth

Panspermia is an idea, that's a fact. Our sun makes helium. It doesn't even make helium that we use - we get our helium from underground deposits filled by radioactive decay.

unsure what your point is

I think parent's point is that, to an extremely accurate approximation, none of the elements on Earth come from the Sun. Hence, while it's true that trace elements didn't come from the Sun, it's weird to focus on that because nothing else did either.

EDIT: And it's also weird to tie this to the fact that the Sun won't produce elements heavier than iron through normal (i.e. non-nova) fusion late in its life since that has nothing to do with it.

Panspermia isn't widely accepted, but stellar nucleosynthesis/supernovae are generally accepted to be the source of the heavy elements.

There is this theory that speed of light is not symmetrical, that is it may be c/2 in one direction and infinity in the opposite one. Given that, we could perceive that meteorites took millions of years to arrive, but it could be in a instant.

You overstate it by calling it a theory. I'm sure you just watched the Veritasium video [1] on this very subject. The point wasn't to claim that space has a preferred direction (which would contradict known physics) but highlighting that there is no way to prove the speed of light is uniform, only that the round trip speed is 'c'.

Second, even if the speed of light is unbounded (or has a much higher bound) in one direction, that doesn't give a free ride for objects with mass to travel any faster than they currently do. It would take an incredible amount of energy to accelerate such rocks to near/above the constant 'c' and then you'd need to explain how it returns to normal asteroid speeds before crashing into Earth.

[1] https://www.youtube.com/watch?v=pTn6Ewhb27k

Thank you! Haha yes I watched Veritasium video...

With synchronized atomic clocks, I could measure one-way speed - at least well enough to tell the difference between c, c/2, and infinity.

Watch the linked video. He goes into that issue.

No, I'm not going to watch the linked video to find out whether he's really answering my question or not. Tell me why I can't synchronize two atomic clocks that are right next to each other, then put one in a car and drive 1000 km away. Tell me why that won't allow me to correlate departure and arrival times well enough to answer the question.

You are being rather demanding, but I'll bite anyway.

When a synchronized clock is accelerated, it will experience time dilation as compared to the stationary clock; they will no longer be synchronized. You might think: ah, I'll just correct for that using relativistic calculations. But you'd be wrong again because Einstein explicitly states that everything in his theory assumes that the speed of light is uniform.

Really, the video does explain all this and more.

What is the opposite direction anyways? Opposite to what? The original message? What if the two transceivers are rotating around the sun on opposite sides? What is one direction at one point in time is now another direction at another point. Is there a difference between bouncing a signal off of a mirror back to yourself and sending a signal which then gets a response from the receiving party? Is my point coming across? Because like, are we talking about direction relative to a receiver or direction relative to some fixed body in space?

Such a theory is in conflict with more than a century of searches for anisotropies of spacetime. No anisotropies have ever been found, beginning with Michelson's seminal experiment.

What? How did you arrive at that conclusion?