APOD: M15: Dense Globular Star Cluster (2018 Oct 17)

[coffeesippin]

And you can bet your anti-gravity boots they're working hard on Time Travel while they're at it.

[neufer]

An additional problem with having planets in and around globulars would be the extremely low metal content of the material that created these star systems. Way back when these star systems were forming there wasn't hardly any heavy elements yet, so forming rocky planets would have been much harder.

There wasn't hardly any heavy elements yet

Some, but not nearly as much as when our solar system formed. M15's metal content is now found to be -2.37 dec, or only 10^-2.37 = 0.00427 times the sun's value. My inference would be that it might well have been much harder for rocky planets to have formed out of material so thinly enriched with metals. It takes a lot of rocks to make rocky planets. Bruce

`Then you should say what you mean,’ the March Hare went on.

[Chris Peterson]

I hope the NASA National Security Advisors are more up to date than a couple of participants here .. the Chinese are set to get non-local communication going soon. https://www.sciencemag.org/news/2017/06 ... d-distance

And that matters why? Even conventional encryption methods are not practically breakable now. Adding another isn't going to change much.

[MarkBour]

I hope the NASA National Security Advisors are more up to date than a couple of participants here .. the Chinese are set to get non-local communication going soon. https://www.sciencemag.org/news/2017/06 ... d-distance

You reference an article that reports that photons have been quantum-entangled and then sent far apart and remained entangled. I don't see how this could ever help someone transmit information faster than the speed of light.

[Chris Peterson]

I hope the NASA National Security Advisors are more up to date than a couple of participants here .. the Chinese are set to get non-local communication going soon. https://www.sciencemag.org/news/2017/06 ... d-distance

You quote an article that reports that photons have been quantum-entangled and then sent far apart and remained entangled. I don't see how this could ever help someone transmit information faster than the speed of light.

Indeed. Quantum entanglement provides opportunities for perfect encryption, but it does not violate the constraint on how fast information can be transmitted. It does not allow faster than light communications.

[bystander]

I hope the NASA National Security Advisors are more up to date than a couple of participants here .. the Chinese are set to get non-local communication going soon. https://www.sciencemag.org/news/2017/06 ... d-distance

You quote an article that reports that photons have been quantum-entangled and then sent far apart and remained entangled. I don't see how this could ever help someone transmit information faster than the speed of light.

Indeed. Quantum entanglement provides opportunities for perfect encryption, but it does not violate the constraint on how fast information can be transmitted. It does not allow faster than light communications.

Well, there's no telling what those National Security Advisors at NASA are doing. They are a pretty secretive bunch of people. In fact, I'm not sure how coffesippin even knows about them.

[CoffeeSippin]

Well, there's no telling what those National Security Advisors at NASA are doing. They are a pretty secretive bunch of people. In fact, I'm not sure how coffesippin even knows about them.

We're sippin' coffee of course.