JWST: Identification of carbon dioxide in an exoplanet atmosphere
arxiv.org
arxiv.org
https://www.nytimes.com/2022/08/26/science/space/webb-telesc...
That said, we're both just guessing.
[0] I don't know anything else which does this, but that's mostly because I'm a software engineer and my highest chemistry qualification is a 22 year old GCSE grade B.
"WASP-39b is in the Virgo constellation, and is about 700 light-years from Earth"
It's only ~20 times further away than the closest star.
From the local timeframe of people on the ship, a constant 1g of acceleration and then deceleration would get people there in a little under 13 years.
bottomline, you get progressively closer to speed of light and time slows for you so you can cover larger and larger distance in local frame. problem is finding this 1G drive.
Edit: actually, from the perspective of people on Earth, it will roughly arrive 700+1 years later.
Only if either cruising at a large percent of the speed of light, or with constant acceleration. Neither of these is achievable with any technology we know exists, but neither is ruled out by current physics either.
A 7 million year period is very different. Humans split off from chimpanzees 7 million years ago. The people that step off that ship will probably not be human. Even with radiation shielding, even with genetic engineering, keeping genes stable enough to stay compatible with current humans is... unlikely. It's easy to say they could just have DNA on file, but the actual reality of that challenge is mind-boggling. How do you handle a space ship where you have to account for wind erosion in the hallways?
So people think, OK, who plays the Europeans? Some movies say Earthlings do, other movies say aliens do. Either way, plunder and pillage. Like one movie, very enlightened, said the aliens just wanted our gold. That's wantable. But like think of it in terms of apes, like a primatologist. Aliens would be going somewhere with shit technology right? Well the real reason would be to get our nice biosphere, before we wreck it long-term ourselves. That they could want. So, for a rough handle for alien's interest in humans, look at primatology or study of cetaceans. Yeah we spend trillions on space travels, rockets, telescopes. I doubt we've even spent a billion on primatology. Cetaceans I think has cost more than a billion. There's just way more money and brains in whales than apes.
I think space colonization will be similar to European Colonialism but only for the Solar System. After that, it sucks. And it doesn't stop sucking for at least 700 light-years.
This I agree with.
> I think space colonization will be similar to European Colonialism but only for the Solar System.
This I disagree. Without von Neumann machines, at best the initial colonisation of the Sol system will be like whichever human first found Iceland or Greenland, but only if they got there via a shipwreck.
If we do get von Neumann replicators soon enough to avoid that, we may just Dyson this system and go directly to every galaxy in our future light cone.
And that ties into why we have ten fingers, like we have thirty-two teeth at adulthood and need some removed, that is after losing the first round of teeth in childhood. There's replacements. Some monkeys used for experiments need to be kept in cages, watching cartoons (meant for human children, same ones, they don't make special cartoons for the monkeys), and the monkeys (I wish I remembered what species this was) stop and stare at the screen, paralized. Keeps them pretty happy while they're isolated from each other in cages. Normally they're not kept in cages, except for this experiment, you know why? This experiment required them having all ten fingers, like humans, but if left hanging around as a group they bite each others's fingers off like in the first three minutes. Just to figure out who gets to fuck, basic pecking order, right off the bat. Ten fingers is like ten shirts. In Utopia Thomas More...well one of his characters, he specifically wrote that book within a book to defray responsibility...said if you have ten shirts you are a clotheshorse. Too many clothes. Because they had such a huge cost. A cost of drudgery, then performed by the mechanical loom. That's one organ.
von Neumann machine. Organ by organ.
Like can you imagine a whale telling another whale e=mc^2? Who gives a shit! Want a Nobel Prize you blowhole? Gotta keep hunting squid every day, that's the bottom line, philosophy (don't know the whale word for this) is for when both us whales are full. The human hand is what gives that the power it has, humans are busting open a bottleneck of life with our hands. I'm typing this with all my fingers. I couldn't do this by voice. It would come out different, not as spinal. In fact my hands are writing faster than my inner monologue. They absolutely have a life of their own.
Yeah shipwrecks. For sure there were people crossing the Atlantic via shipwreck, they could flat-out never make it back. Even then people could be disbelieving and say, "eh old Mariner's tale.". Nobody buys those stories, nobody buys the stories about sea monsters (whales intelligently ramming ships crossing their territory), everybody thinks sailors are full of shit. That's what happened with the Vikings, who did cross the Atlantic, but couldn't exploit it nicely (from the explorer's point of view) like the Hispanics. It's also because Vikings crossed before the Black Death, so they weren't infected with smallpox. Bioweapon. Back to the shipwrecks: this fact, that you can't make it back, was critical to the Atlantic Slave Trade: Africans had no hope of returning to Africa, once an African sold an enemy off to the Europeans headed for America, he had no worries of seeing that enemy return to Africa. That was key. A Colonial historian told me this.
I think not. European Colonialism for the Solar System will be the first phase of becoming a race of people in tin cans.
When travel takes more time than building a working economy at the destination, it makes more sense to learn how to live a traveler's life then how to terraform planets to replicate Earth.
Just think about it. Space ship traveled for tenths of thousands of years and has reached it's destination. Who are the people on the ship? They are for many generations lived on a space ship. When they were kids they heard stories about living under an open sky on an outside of a spherical surface in a gravity well, but it is all like fairy tales. Not because they are false, but it is a shadow of an ancient memory. No one experienced this first hand, and no one talked with people experienced it. It is like Bible's stories, but even further in time.
So the question is: will these people think it is a good idea to leave space ship to try to build a fairy tale? They were content with living in a tin can not just for generations, but for whole epochs. Why they suddenly change their mind and decide that living under an open sky would be better than in a tin can?
I think that there will be different opinions, so some people will jump to building a fairy tale, while others just chill a little here near the star, and then move away from it, to a life free from all this solar wind wearing down the outer shell of their ship.
If humanity wants space colonization, then it needs to think about space ships where hundreds of thousands or millions of people can live. And these people pretty much will be space-ship people, believing that it is the true way to spend a life.
"WASP-39 b is a hot, puffy gas-giant planet with a mass 0.28 times Jupiter (0.94 times Saturn) and a diameter 1.3 times greater than Jupiter, orbiting just 0.0486 astronomical units (4,500,000 miles) from its star"
The atmosphere of both Mars and Venus are 95% CO2. Earth had plenty of CO2 before humans even existed. In fact, there were periods hundreds of millions of years ago where Earth had drastically more CO2 (up to 9000ppm vs 420ppm today) than it does today.
Maybe that's something we'll detect over the course of hundreds of years of observing, but the shear scale of the time of the universe makes the chances that some other alien species just happens to be going through an industrial revolution while we're around to observe it, are so astronomically small as to barely be worth considering.
In your example, an intelligent species in an industrial revolution would probably be at the bottom of the list of likely explanations, simply because of how statistically unlikely it appears to be.
I'm confused; aren't literally all but one of the elements heavier than helium?
(I'm an astronomer)
And that's giving far too much weight to the Metals ;-)
(1% of total mass)
The universe really is just Hydrogen + Helium + rounding error...
https://www.explainxkcd.com/wiki/index.php/2640:_The_Univers...
1. Fission of the plutonium pit
2. Fusion of a small amount of deuterium-tritium at the center of the plutonium pit (designed to be a source of extra neutrons to boost the yield of the plutonium fission)
3. Fission of Lithium-6. Yep, Lithium can undergo fission when bombarded with neutrons. It can't sustain chain reaction, but it's fission nonetheless. The main idea is to generate Tritium, which goes into the next phase, but the energy generated during the fission of Lithium is nothing to sneeze at. Pound for pound, it generates about as much energy as the plutonium.
4. Fusion of the hydrogen (tritium produced from the previous step, and deuterium that's stored in the form of Lithium Deuteride from the beginning)
5. Fission of a rod of plutonium in the middle of the cylinder containing the hydrogen (fission is returning the favor and boosts the fusion reaction)
6. Fission of the uranium temper. The main point of the uranium temper is to be heavy and contain the nuclear reactions for a tiny bit of time, so more generations of reactions can happen, but the secondary outcome is that some of the U-238 nuclei will undergo fission when bombarded by the neutrons from the inside of the bomb.
We may not be just 'star stuff', but some 'big bang' stuff as well :) (Probably would be anyway if you look at Helium and Hydrogen).
https://www.explainxkcd.com/wiki/index.php/2340:_Cosmologist...