Gian

On 7/6/2021 at 12:03 PM, swansont said:

 

Yes. We don't have knowledge of the laws of physics at that scale. We don't know the answer.

Why does it have to happen instantaneously? That's not the only option.

 

 

Well because I was given the impression that the singularity does not and cannot have any dimensions; the singularity is 0x0x0mm. 

Yes it's not instantaneous, but I thought that because of the gravity involved, it wouldn't take that long to reach 0x0x0mm. 

But given these forces, I guess it never quite gets there. 

I read somewhere that eventually black holes will evaporate away, although I've no idea how

I found loads of Red Squirrels on the Isle of Wight in the summer, but due to the invasion of Grey Squirrels very few are left on the mainland of Great Britain.

Is it theoretocally possible to develop a pharmaceutical contraceptive substance specific to one particular species like the Grey Squirrel, but which would not affect Reds or any other species? 

We need our Reds back!

Cheerz GIAN😊

To everyone who's replied THANKS ❤🙂🙂

7 hours ago, beecee said:

Space mining is still a dream at this stage, but the Asteroid belt and Kuiper belt would be promising places to look, when we have the technology.

There was a company called "Planetary Resources" but I believe that was bought out and/or made defunct in 2018.

https://en.wikipedia.org/wiki/Planetary_Resources

Thanks 🙂

1 hour ago, SergUpstart said:

$10,000 quadrillion asteroid Psyche?

By the way, you can’t (at present) put a true price on objects such as asteroids. But many have tried to estimate the worth of asteroid Psyche, with its metal-rich composition. One estimate suggests the massive, metal-rich object is worth $10,000 quadrillion (that’s 15 more zeroes), more than the entire economy of Earth. https://earthsky.org/space/asteroid-psyche-metal-or-rubble-pile/

Does her composition give psyche a magnetic field?

7 hours ago, beecee said:

Space mining is still a dream at this stage, but the Asteroid belt and Kuiper belt would be promising places to look, when we have the technology.

There was a company called "Planetary Resources" but I believe that was bought out and/or made defunct in 2018.

https://en.wikipedia.org/wiki/Planetary_Resources

Thanks 🙂

Do we know many metals are in the outer solar system? eg the gas giants, Pluto, their moons and the Kuiper belt? 

Or can someone point to some easily intelligible layman's literature.

I'm thinking that if human beings were living there, they'd need to mine metals to make their own stuff.

Cheerz

GIAN 🙂

Cheerz x

Theoretical physicists always proclaim portentously that the singularity at the centre of a black hole "is where our laws of nature break down" which sounds to me like another way of saying "we don't know the answer."

But as no physical process is ever absolutely instantaneous (I think,) surely the collapsing matter gets smaller and smaller while slowed down by ever increasing density so it never quite gets to the singularity and the process continues to infinity.

Eg if you keep dividing 1 by 2 you'll never get to zero.

Cheerz

GIAN🙂

(I've no science qualifications beyond gcse maths n physics grade C, so pls be gentle with me.)

For vitamin D synthesis, is daylight on an overcast day as effective as direct sunshine?

Cheerz

GIAN

Thanks for the above replies.

Hi Zapatos, with a pulled pork sarnie I could do without chips. But yes you have a really good point. Sci-fi often pictures settlers arriving on new worlds and then starting agriculture to support themselves. But in our solar system, maybe it would be a good idea to start producing food on other planets of the solar system before people get there.

And if someone sent a crate of pork chops to Titan, with her surface temperature of -290°F, I bet they'd still be edible even if explorers didn't get there for another ten years.

Scientists theorize that there may be a big subterranean ocean of liquid salt water on Europa, and there is a proposal to send a space probe which could drill down to it.

In such an ocean there would be presumably no light, and I don't know if there'd be any CO₂  or what temperature the water would be, but by introducing autotrophs from our own oceans would it be possible for explorers to start a food chain, gradually introducing higher species culminating in fish?

This would permanently give explorers and settlers something to eat, although they'd have to have chips sent up from Earth.

Cheerz GIAN 🙂

Cheerz

Gian x

If microbial life is discovered in Venus' atmosphere, and samples are collected, will science be able to tell us whether its ancestry somehow found its way there from Earth, or whether it's definitely a product of abiogenesis on Venus?

Thanks

GIAN 🙂

Thanks Swansont. What is 'displacement?' 🙂

Apparently the Orion Project for nuclear powered spaceflight asserted that by this method with an acceleration of 1G an Orion spaceship could attain a speed of 10% of the speed of light (c.)

Mathematically, how do I work out

1. the length of time it would take to get from 0 to a speed of c/10 (ship's time,) and

2. what would be the distance travelled in that time?

Cheerz

GIAN🙂

28 minutes ago, joigus said:

Yes, the fact that there are lots of methane and ethane could be very useful to obtain energy/store it for different purposes. I don't know about how efficient electrolysis of water in Titan would be. Maybe someone can help about that. My personal favourite in terms of generating oxygen is analogues of cyanobacteria that could work in Titan's conditions. You would need a microorganism that liberates oxygen... It seems that the most abundant source of oxygen in Titan is water. Not much CO₂ from volcanos.

Bacteria and archaea of some kind on Earth manage to exploit virtually any redox-reaction that the chemists have been able to draw on the whiteboard. So, possibilities there are.

https://en.wikipedia.org/wiki/Titan_(moon)

Magnetosphere. Stars and gas giants have very powerful magnetic fields around them that, in the case of Saturn, whip their moons with very strong and potentially very damaging ionizing radiation. This radiation is mutagenic, and most mutations would result in cancer. The Earth, e.g., is protected against the Sun's magnetosphere by its own magnetic field. The problem with these moons is that generally they are geologically inactive, so the don't have own magnetospheres to act as shields.

https://en.wikipedia.org/wiki/Magnetosphere_of_Saturn

Here they seem to suggest the opposite of what I was saying, that Saturn's magnetosphere shields the moon from solar wind. [?] Maybe it's a question of prevailing winds...

As to soil minerals, the problem with life is that you must move all the chemicals in cycles: nitrogen, carbon, water, iron... That would take a massive engineering grand scheme of recycling.

Because Titan is being the subject of intense study now, I wouldn't take anything we know now as set in stone.

I'm no expert on this. I only want to entice nice and informed conversation here, because the topic is interesting. +1

Thanks 🙂

I picture explorers creating giant igloos to use as greenhouses, with methane-powered heating to room temperature and melting water ice for crops and pasture, and also extracting oxygen from water (electrolysis?) to make breathable air. But yes I suspect there wouldn't be enough 'goodies' on the Titanian surface to grow stuff, so the astronauts would have to bring their own compost.

Can you define magnetosphere and explain why it would be a problem for animals please? (I'm a novice at science) Thanks

GIAN 🙂

When explorers eventually reach Titan, I suppose they could take some farm animals with them which if they had enough to eat would create manure, although I'm not sure how pigs and cattle would get on in the low gravity (flying pigs?)

But would there be enough minerals lying about on the surface to use as soil to grow crops? Would there be enough nutrients in it? Titanian wheat and potatoes?🙂

On 7/16/2020 at 8:11 PM, Danijel Gorupec said:

I think, if our civilization continues without a reset, we will very soon start to intentionally change ourselves at a rate much faster than natural evolution could do. We will engineer our genetic codes (we will also install non-living implants into our bodies to obtain above-natural capabilities and we will even create self-reproducing machines not based on DNA that will continue to evolve themselves at an 'explosive' rate).... So, ironically, the 'intelligent design' might soon be thought as a mainstream

On the other hand, could biology one day become machines? Eg, scientists could design biological organisms to do what machines do for us now? A biological motorcar which can drive passengers around on wheels at upto 100mph but also eats grass for fuel?

21 hours ago, dimreepr said:

Evolution doesn't have an agenda, it's a discription of a process; you may as well ask "If I got £20 using my bank card from an ATM today, will I get £100 tomorrow?".

The natural human lifespan has extended from the lifespan of the first life forms. Is the extension of lifespan a natural consequence of evolution and will it continue?

21 hours ago, delboy said:

3. Something extinct cannot evolve again - extinction is final. Something similar - seems unlikely but who knows. 

What I mean is, is it at least possible with natural selection that vast organisms something like dinosaurs could evolve again? 

Three questions

1) If the first life forms c 4y.billion ago lived about 24 hours (?) and we now live about 80years, in another 4y.billion will life expectancy continue to increase in a straight line and our descendants will have lifespans of 2.5y.millon?? If so it will certainly make intergalactic travel more practical!

2) Is our species H.Sapiens continuing to evolve? Will our descendants become a new species or species?

3) Will the natural course of evolution without human agency cause the dinosaurs or something like them to evolve again in the far future?

Cheerz GIAN 🙂

Thanks 🙂

If we can create nuclear bombs 1000x hiroshima, wouldn't it be fairly simple to use it to power space ships which could accelerate to the point where a trip to the outer planets would take days rather than years?

Is it true that this is already quite possible, but governments won't let us do it because of the potential dangers of nuclear accident?

Cheerz GIAN xx

inow and swansont

Well yes,  hopefully sunlight could be turned into energy in another form eg motion and/or light. Yes there would be waste heat but presumably not as much as if the sunlight energy had not absorbed at all. And yes a percentage of the 'harvested' sunlight would also be reflected away from the Earth.

Presumably if if it was done on a big enough scale there would be a net cooling of the Earth, plus an additional reduction of CO2-producing forms of energy production?

cheerz

Gian

If there were enough solar panels installed across the world, besides give us lots of cheap energy would this also reverse the effects of global warming? If so, how many would be needed?

cheerz

Gian

Cheerz Mr Strange. Well at least someone could produce a generic basic probe with additional components which could be added as required according to the nature of the mission.

Thanks for the SpaceX tip I'll check them out

GIAN x

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