Recent content by Entropix

Your opinion mate.

Does any astronaut had the curiosity to inflate a hydrogen balloon on orbit? Inside space station and outside.

It's not high but just outside of it density is very low once it reaches the outermost atmosphere. I trust more PF than google ;) but even from your search we can see 173900 is huge vs 137000. So you see more likely those balloons can't make it very far even taking 173900 as reference. So we...

Above 60000 feet (~18 km) those balloons can't reach or those are meteorological balloons? What's the maximum height those balloons can reach?

Good luck with that..

So you guys say the balloon will simply remain somewhere on the edge of the atmosphere? Ok I'm not insisting that the balloon goes indefinitely in the outer space but why scientists didn't make this kind of experiment? The only experiment I've heard of was about an astronaut jumping from a...

Cos the further outer space it gets hydrogen exerts higher and higher pressure. But assuming thru absurd the balloon never disintegrates nor leak what will happen then? 🤔

I would predict that our balloon will go indefinitely into the outer space till the force exerted by the hydrogen will get so powerful it can no longer be contained even by those tough carbon nano tubes. Once the balloon eventually disintegrate, hydrogen within will be scattered around and will...

If we launch a hydrogen balloon from the Earth surface (let's say it has a 2 meter radius) and assuming it's strong enough so it doesn't pop/disintegrate (it's made out of carbon nano-tubes). Where this balloon will stop? I'm more interested in the exact altitude it reaches or if it will keep...

Well yeah but to have an angular momentum it means that we have a solar system or a star that has a mass, a tangential velocity and some orbit with a certain radius but the question would be what makes them having all that? Also if centrifugal forces of the BHs do not change the motion of the...

This I think isn't off-topic cos it provides an essential context given the fact that dark matter has such important role and Esa Gaia project not only confirmed this but additionally revealed this 'cannibalism' process between galaxies. Hope the big league scientist at the top that have dark...

Ok, thank you all for these clarifications and better explanations of how things might/or do happen down there at a more refined scale than my previous understanding. I've just read an article that said and I quote: 'One black hole, at the heart of galaxy NGC 1365 is turning at 84% the speed of...

Ok, my understanding was that only the INFORMATION can not exceed light speed not necessarily that two objects can not exceed light speed thru velocities addition relative to one another. Previously I thought that because our universe expands in an accelerated fashion some distant galaxies that...

@phinds Velocities adds up when taking the GC and the faster moving rocket around the moon as references. If you have a mosquito inside your car that flies with the v1 considering your car as a reference it doesn't move with the car velocity alone vs a ground based reference it moves with v1+v2...

Long time had this question about how fast a planet, dwarf or not or even a rogue asteroid can move relative to the core of the Galaxy, where, if my understanding is correct it has to be a supermassive black hole. Knowing satellites revolves around a planet and this system circles around a star...