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Physics, Astronomy & Cosmology / Re: Do you believe in possibility of life in other galaxies?

« on: 31/07/2021 08:21:28 »

But still, there is a possibility that in some galaxy and in some exoplanet there are some forms of life or this planet can be similar to Earth in conditions for living for humans.

By the logic spelled out above, it is essentially a certainty, yes.
The beings living there will probably not be particularly human-like, but perhaps the chemistry will be somewhat similar such that we might be able to eat the local vegetables.

OK, so such a place likely exists. So what? We can't sense it.

If we only consider planets within our visible universe, less than 2.5% of them are within the Hubble radius, and far less than 1% of those are within 2 billion light years distance. So suppose somebody a mere couple billion light years away has fantastic sensing technology and notices Earth has the right atmosphere and environment for them.  They also have ships that can move at nearly light speed.  By the time they get here (4 G-year minimum), the Earth will be a charred smoking husk, certainly not the friendly environment they sensed from afar. Such environments are temporary. Maybe some life here has evolved to a hot dry planet, but it won't be what the visitors came here for.
So the existence of some planet habitable to us without modification is of little interest to humans even if we could somehow know where it is. It has to be reasonably close by.

Yes, you are right. At that time even if we detact such planet with the help of super powerful telescopes, we cannot define if it`s exactly the planet we are looking for. Not even taking into consideration the fact that we cannot reach it and we have no ideas how to do it.

I wanna add a few words about the possibility of life in other galaxies. There is one theory about Proxima B . I have heard some interesting ideas about Proxima B and some scientists are convinced that this exoplanet might be the second Earth. What do you think about that?

Although, many people assume that Proxima B might have the same Environment as Earth. I guess we will have more detailed information when the James Webb Space Telescope will be launched

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Physics, Astronomy & Cosmology / Re: Do you believe in possibility of life in other galaxies?

« on: 31/07/2021 08:14:39 »

But still, there is a possibility that in some galaxy and in some exoplanet there are some forms of life or this planet can be similar to Earth in conditions for living for humans.

By the logic spelled out above, it is essentially a certainty, yes.
The beings living there will probably not be particularly human-like, but perhaps the chemistry will be somewhat similar such that we might be able to eat the local vegetables.

OK, so such a place likely exists. So what? We can't sense it.

If we only consider planets within our visible universe, less than 2.5% of them are within the Hubble radius, and far less than 1% of those are within 2 billion light years distance. So suppose somebody a mere couple billion light years away has fantastic sensing technology and notices Earth has the right atmosphere and environment for them.  They also have ships that can move at nearly light speed.  By the time they get here (4 G-year minimum), the Earth will be a charred smoking husk, certainly not the friendly environment they sensed from afar. Such environments are temporary. Maybe some life here has evolved to a hot dry planet, but it won't be what the visitors came here for.
So the existence of some planet habitable to us without modification is of little interest to humans even if we could somehow know where it is. It has to be reasonably close by.

Yes, you are right. At that time even if we detact such planet with the help of super powerful telescopes, we cannot define if it`s exactly the planet we are looking for. Not even taking into consideration the fact that we cannot reach it and we have no ideas how to do it.

I wanna add a few words about the possibility of life in other galaxies. There is one theory about Proxima B . I have heard some interesting ideas about Proxima B and some scientists are convinced that this exoplanet might be the second Earth. What do you think about that?

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 17/07/2021 11:36:41 »

It would be much better to invest in technology and projects that can preserve Earth. I have already mentioned on this forum but in another thread  satellite technology that can track rare species of animals to prevent them from being killed by poachers. Also, there are special satellites that can observe coral reefs in order to help scientists to save it.

Of course preserving earth is mandatory, since it's the only place in the universe which we know for sure contains and supports existing conscious entities, at least for now. But we shouldn't restrict ourselves to become too dependent on it. We know that the universe is much larger than earth, and it's mostly unexplored. Terraforming other planets is just a stepping stone to expand consciousness further, even beyond our solar system. It's extremely unlikely to achieve the universal terminal goal if we restrict ourselves to a tiny spot so insignificant in size, compared to observable universe.

You are right, the universe is very large and it may contain the second Earth. However, the Earth's atmosphere not only gives us O2 but also saves us from the harmful rays of the sun. This is also very rare, none of the planets in the solar system has that kind of atmosphere. There are many other things that may extinct all life on Earth but are not happening because the Earth is, the way it is(example: Earth's magnetic property)

You are right, the universe is very large and it may contain the second Earth. However, the Earth's atmosphere not only gives us O2 but also saves us from the harmful rays of the sun. This is also very rare, none of the planets in the solar system has that kind of atmosphere. There are many other things that may extinct all life on Earth but are not happening because the Earth is, the way it is(example: Earth's magnetic property)

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 16/07/2021 14:48:04 »

It would be much better to invest in technology and projects that can preserve Earth. I have already mentioned on this forum but in another thread  satellite technology that can track rare species of animals to prevent them from being killed by poachers. Also, there are special satellites that can observe coral reefs in order to help scientists to save it.

Of course preserving earth is mandatory, since it's the only place in the universe which we know for sure contains and supports existing conscious entities, at least for now. But we shouldn't restrict ourselves to become too dependent on it. We know that the universe is much larger than earth, and it's mostly unexplored. Terraforming other planets is just a stepping stone to expand consciousness further, even beyond our solar system. It's extremely unlikely to achieve the universal terminal goal if we restrict ourselves to a tiny spot so insignificant in size, compared to observable universe.

You are right, the universe is very large and it may contain the second Earth. However, the Earth's atmosphere not only gives us O2 but also saves us from the harmful rays of the sun. This is also very rare, none of the planets in the solar system has that kind of atmosphere. There are many other things that may extinct all life on Earth but are not happening because the Earth is, the way it is(example: Earth's magnetic property)

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 09/07/2021 08:54:36 »

Someone has thought about it.

I assume a better would be to invest in technology and projects that can preserve the environment and Earth. I have already mentioned on this forum but in another thread  satellite technology that can track rare species of animals to prevent them from being killed by poachers.

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 06/07/2021 14:59:16 »

Colonizing Venus makes no sense whatsoever. Who wants to live in a flotilla above a totally inhospitable environment? I mean if it were the only option for survival then yes, otherwise not worth it. Also completely unworkable from a colonization perspective. To be a colony it needs to have a significant if not total ability to be independent. There is no way that some flotilla in the atmosphere of Venus can supply its own raw material needs for manufacturing as mining the surface of Venus would be well beyond what a flotilla environment could manage. Perhaps might be feasible and reasonable for NASA or the like to put a floating research station there with rotating crews and regular supply runs, but that would be about it. IMO NASA puts out silly things like this just to keep the public's interest in space so they can continue to get funding. All pipe dream nonsense, but it captures the public's imagination.

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 05/07/2021 12:38:15 »

a self sustaining colony on mars that really makes no sense.  The cost of a colony and the distance makes it impractical.

You could say the same for colonies in Iceland, North America or Australia.
- Some of them failed, but some eventually succeeded to the point where they became self-sustaining
- There were different motivations - exploration, national pride, conquest, land, resources, escaping from a difficult situation or getting rid of a difficult problem.
- For now, Mars is in the exploration and national pride stage
- It is hard to imagine what resources would justify the trip - water is valuable for space exploration, but it should be easier to get it from the Moon
- Elon Musk is concerned about one difficult situation: humanity currently has all its eggs in one basket - and the basket is turning into a basket-case. In this scenario, the great distance is a benefit.

Talking about the colonization of other planets, This is a video about the possibility of the colonization of Venus put forward by NASA. Personally, I think the idea of colonizing Venus is a completely useless idea. Even more useless than colonizing Mars. Venus's environment is even more harsh than the environment on Mars which will we should understand that the life of human beings will be changed completely as a result of the harsh environment of Venus and will not be the same as we have on Earth.   

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General Science / Re: The journey to the red planet: does humanity need Mars colonisation?

« on: 02/07/2021 12:20:30 »

I think this question is very relevant. At the moment, humanity is not ready to colonize Mars, but I have no doubt that the time will come and people will live on Mars.

Probably you are right and one day we will colonize the red planet. But we should understand that the life of human beings will be changed completely as as a result of the harsh environment of the red planet and will not be the same as we have on Earth.

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Physics, Astronomy & Cosmology / Re: Can we turn waste plastic into rocket fuel?

« on: 02/06/2021 08:28:33 »

Also, there are many types of plastic such as PP, nylon, ABS, PVC etc. so it will largely depend on the type of plastic you use for the fuel.

Yeah, I`ve mentioned here in this thread that only the following types of plastic waste can be remade into rocket fuel Polypropylene (PP).Polyester (PE). Polystyrene (PS) and its mixtures and analogs

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Physics, Astronomy & Cosmology / Re: Could there be life on other planets?

« on: 28/05/2021 13:09:50 »

Rather interesting thread. That is a piece of good information. But still, we can only presume that life can exist there because these planets are too far. I think probably such space missions like James Webb Space Telescope the most expensive and the most advanced telescope by NASA or Ariel space telescope ( recently I found an article about that telescope on a website ) and, it has the same purpose as James Webb Space Telescope to search for planets found beyond our solar system, otherwise known as exoplanets or extrasolar planets. I guess such technology will give us a hint at where life can exist and open more exoplanets.
https://en.wikipedia.org/wiki/James_Webb_Space_Telescope

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Physics, Astronomy & Cosmology / Re: How are 3D printers being used for aerospace applications?

« on: 28/05/2021 09:25:33 »

It was such a surprise for me that airplane jet engines and some rocket engines are made with the help of 3d printing technology.

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Physics, Astronomy & Cosmology / Re: How are 3D printers being used for aerospace applications?

« on: 27/05/2021 14:00:49 »

I Observe ALOT of Blogs been written on the Subject Matter of the OP.

P.S. - Did You have a relating query on the topic or was it just sheer excitement to share the info?

The 3D printer I`ve mentioned is called additive manufacturing services and here you may find more detailed information about this invention made by a small aerospace company. This 3 d printer allows printing multi-composite parts simultaneously from several materials, which is infeasible in other types of aerospace 3d printing.

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Physics, Astronomy & Cosmology / As far as IRe: Can we communicate with civilisation in anti matter solar systems

« on: 20/05/2021 12:17:34 »

As far as I know, we don`t have such technology that can allow us getting in touch with some forms of life out of the Solar system. Also, we cannot travel in other galaxies or make uncrewed missions. I`ve read recently that scientists had cought a radio wave somewhere out of our Solar system

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Physics, Astronomy & Cosmology / How are 3D printers being used for aerospace applications?

« on: 29/04/2021 15:00:32 »

I`ve recently found an interesting article about 3D printer which is used in aerospace area. Have you heard anything about that? This machine allows to print multi-composite parts simultaneously from several materials, which is infeasible in other types of aerospace 3d printing.

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Physics, Astronomy & Cosmology / Re: The danger of the solar activity and how to monitor it?

« on: 07/04/2021 13:56:50 »

Depends what you mean by "solve". It doesn't help to see the train coming if you are tied to the rails. 

Early warning of charged particle radiation might help to shut down electricity grids and suchlike, but you ain't gonna rotate the earth's axis to even out the heat.

There is a problem that the Sun does not always radiate equal levels of brightness. It takes 11 years to fulfill just one solar cycle, varying in brightness with the ability to dim throughout this time. The appearance of the sun and its activity varies through each solar cycle, causing the levels of solar radiation emitted to increase and decrease.
So there is only one way how manage with that problem. It`s to use satellite technology to forecast the influence of this activity on the Earth’s climate.

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Physics, Astronomy & Cosmology / The danger of the solar activity and how to monitor it?

« on: 07/04/2021 08:47:16 »

The Earth’s climate is heavily affected by the amount of energy radiated onto Earth by the sun. The amount of radiation from the sun influencing Earth and the way in which this radiation is distributed across the various seasons and latitudes around the Earth, is directly influenced by changes in solar activity. Most scientists consider satellite technology the most effective way to solve this issue. What do you think about that?

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Physics, Astronomy & Cosmology / Re: Can we turn waste plastic into rocket fuel?

« on: 05/04/2021 09:25:09 »

Have you heard about the new special type of rocket fuel that is made from plastic waste? One company uses particular kinds of plastic to remake them in rocket fuel

Have you heard of landfill mining?

https://en.m.wikipedia.org/wiki/Landfill_mining

They realise that let alone the metals their is enough plastics to burn as fuel to make them worth while.

How do you relate to the point that the burning of plastic doesn't harm the environment? As far as I know and it doesn`t have any effect on air pollution. According to the article I`ve mentioned in this thread, it claims this rocket fuel is ecofriendly

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Physics, Astronomy & Cosmology / Re: Can we turn waste plastic into rocket fuel?

« on: 05/04/2021 09:05:29 »

I`d like to add some information about another propulsion. It`s the combination of solid Hydroxyl Terminated Polybutadiene (HTPB) fuel and 90% Hydrogen Peroxide (H202) liquid oxidizer.

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Physics, Astronomy & Cosmology / Re: Can we turn waste plastic into rocket fuel?

« on: 02/04/2021 12:58:03 »

Have you heard about the new special type of rocket fuel that is made from plastic waste? One company uses particular kinds of plastic to remake them in rocket fuel

Plastic is derived from oil, which contains a lot of potential chemical energy. This energy is used directly to fuel vehicles such as automobiles, ships and aircraft.

And plastic is derived from oil.  So it could be used as fuel - especially  in rockets, which are much simpler than cars.

Cars need complicated internal-combustion engines. With pistons, cylinders, crankshafts, gears and other mechanical moving parts.

Whereas rockets only need fuel to burn.  So couldn't a fuel made of oil-derived plastic, supply that need?

I`ve read an article about green rocket fuel that was made by some private space company. This special type of rocket fuel because it is made from plastic waste. This company converts the following types of plastic waste: Polypropylene (PP).
Polyester (PE).
Polystyrene (PS) and their mixtures and analogs

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Physics, Astronomy & Cosmology / Can we turn waste plastic into rocket fuel?

« on: 01/04/2021 15:00:42 »

Have you heard about the new special type of rocket fuel that is made from plastic waste? One company uses particular kinds of plastic to remake them in rocket fuel