151–160 of 351 posts
"Earth-like planet"? It orbits the star every 5 days; it's a quarter of the earth's mass. It's also a tenth the distance from its star that Mercury is from the Sun. It's earth-like only in that its temperature is consistent with there being liquid water.
"Earth-like" just means terrestrial, as opposed to jovian. It means it has a rocky surface.
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A probe based on nuclear pulse propulsion could do it in around 50 years, with today's technology. It's not that we can't do it fast (within one average human lifespan), it's that the project would be very expensive and something like Nasa has a relatively tight budget. I mean we, as humanity, have to have an eccentric billionaire start a Martian fire (SpaceX Starship) under our lazy asses to even start to think abou…
Why is it weird that a private corporation is doing space exploration & technology? Most of the biggest sailing expeditions were undertaken by private individuals and companies (although often under the funding of a royal family). Locomotives and airplanes were also created and perfected by private individuals / companies. The 1950s-2000s NASA model for space exploration was unusual in its centralized approach.
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This is hopeful negativism. - They don't need fusion. A StarShip can deposit hundreds of solar panels and put them on the ground. No, dust isn't an issue because they'll bring a roomba. No, this isn't a joke, NASA martian probes' solar panels were cleaned by a light Martian breeze. - They will be able to become self-sufficient rapidly. They're not going to send 1M tons of cargo to Mars without a deployment plan. Spac…
Mars has dust storms which last months or years, it has no ionosphere, and that dust contains enough perchlorates to poison anything we could eat, including us. Ok, that sentence went somewhere odd at the end but, it's true. A large asteroid has only one of these problems, by virtue of not coming with any atmosphere, ionic or otherwise. I kinda hope Elon is bluffing and actually plans to head to the Belt. I've pencil…
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Maybe an unpopular opinion, but Musk is just plain wrong when he thinks there is any urgency to Mars exploration (or it's just vicarious arguments because rockets are cool). Basically, the tech you need to make a Mars colony truly self sufficient is something like a compact fusion powerplant. Before we have that, no point in worrying about using Mars as a "backup plan", because if Earth was screwed, Mars would have a…
> Musk is just plain wrong when he thinks there is any urgency to Mars exploration (or it's just vicarious arguments because rockets are cool). Mars might not be sustainable in our lifetime but in a century or two? I think it's within the realm of possibility. As for the urgency, the last two years has demonstrated the exact opposite to me. Modern civilization is a hop, skip, and a jump away from instability and disa…
Eh. The physics and proliferation risk are pretty intertwined.
Who's to say we would have been better off with greater historical nuclear weapon proliferation risk but lower climate risk?
We know the path we chose, limited global use of fission power, mostly avoided nuclear weapons proliferation, and did avoid nuclear exchanges. So it's provably a successful (or probably successful) path. Whether an alternative would have gotten the same outcome?
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Going to Mars seems pretty useless to me at this time. It’s a super hostile environment and we don’t have the technology yet to have a self sustaining base there. Give it a few decades and progress in robotics will make a Mars base much easier. There is plenty of work to be done on Earth. We have to solve clean energy production and in general reduce pollution. These are massive technological challenges that deserve…
Did you know NASA only get 0.36% of the US Federal budget? Everything else gets "massive funding".
There seems to be some confusion about the meaning of "within the habitable zone". From the paper (Introduction and Conclusions, respectively) [1]: The habitability conditions of Proxima b, which orbits within the HZ of the star, have been extensively studied (e.g. Barnes et al. 2017; Ribas et al. 2016; Turbet et al. 2016; Meadows & Barnes 2018). On the other hand, the candidate Proxima d orbits much closer to the st…
Here's a good collection of details about the entire star system of Proxima Centauri, including its planets. https://www.star-facts.com/proxima-centauri/ Also fascinating, a relative distance vs time graph of close stars. It turns out we'll have closer distances for 6 in the next 10,000 - 50,000 years. https://www.star-facts.com/wp-content/uploads/2020/08/Neares... Somehow I feel like Elon Musk has a print out of tha…
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Mars has dust storms which last months or years, it has no ionosphere, and that dust contains enough perchlorates to poison anything we could eat, including us. Ok, that sentence went somewhere odd at the end but, it's true. A large asteroid has only one of these problems, by virtue of not coming with any atmosphere, ionic or otherwise. I kinda hope Elon is bluffing and actually plans to head to the Belt. I've pencil…
Isn't long term zero-g pretty hostile to our biology?
4 trillion years. Wow. If there was life on one of the planets, it would have a long time to evolve.
Another point for anyone considering whether we should send a space-probe there... The current fastest man-man object is the Helios 2 space-probe, reaching something like 25 000 kilometres per hour. Proxima Centauri is 1.3020 parsecs away from Earth. So, just diving one by the other, we'd looking at something like 18 000 years as a rough order of magnitude for sending something from Earth to Proxima Centauri. You'd b…
Isn't Parker Solar Probe much faster than that? It's supposed to be going hundreds of thousands of km/h. [1] [1] https://en.wikipedia.org/wiki/Parker_Solar_Probe
We can't even work out how to run our own planet in a consistent and consensual way, I say leave it to the other more civil aliens to inhabit, otherwise we'll end up with another broken planet.