u/Broad-Date4380

During our weekly cosmology discussion salon a big brouhaha developed to the extent that people were shouting.

I proposed that most matter in the universe is invisible, exotic, and still undetected directly.

My friend, a retired physicist firmly believes that gravity itself is being misread at galactic/cosmic scales. He said my theory relies on too many patches to be truth and I’m being too subjective.

I’m curious what the crowd source consensus is : particle dark matter, or modified gravity/MOND-like theories?

If other universes exist, or if reality extends beyond our observable universe, things may be happening there that we can never measure.

But does “we can’t measure it” mean “it doesn’t exist”? Or does it only mean it lies outside the boundary of our instruments, our physics, and maybe even our concept of time?

Or maybe it IS a situation like what is north of the North Pole.

I’m curious to understand other peoples perceptions of this. This has been perplexing me for more than 50 years.

Like maybe the bang is just the first page of a book THAT WE CAN READ.

Imagine you are somehow traveling through space at or very close to the speed of light and you fire a gun while you are hurtling at along at C. The bullet exits your rifle at 500 meters/second would not the bullet travel T speed of C+ 500 meters/second?

Or would the bullet not be able to exit the barrel of the gun? What about the expanding gases? Would they also be locked inside the gun.

I want to practice trading covered calls, rolling up and out etc. I’m looking for a good sandbox to do options

Thanks