Unless there is a big breakthrough (engineering wise) in antihydrogen production, we will be waiting a while for anti-matter probes to visit barnards star. However, through accelerators and Penning traps we already have proof of principle. I think Robert Forward envisioned huge scale solar arrays to gather up the peta exa yotta - watts of solar power, floating photon catchers to spin up antimatter. On this, for Forwards Starwisp, we"ll arrive at this sooner then later.
Sent from AOL Mobile Mail -----Original Message----- From: Brent Meeker <[email protected]> To: everything-list <[email protected]> Sent: Fri, Jun 17, 2016 08:56 PM Subject: Re: LIGO found a second Black Hole collision! There are a few problems though: Keeping the anti-matter isolated from all matter, e.g. in a magnetic bottle. Making the anti-matter; a process whose EROI has many zeros behind the decimal. Getting useful thrust from the annihilation of matter/anti-matter which produces gamma rays. Gamma rays tend to go through stuff rather than push them. Brent On 6/17/2016 5:45 PM, Hans Moravec wrote: > milligrams of antimatter to energize tons of hydrogen reaction mass, it’s an > idea > >> On 160617, at 8:39 PM, Brent Meeker <<a >> href="mailto:[email protected]";>[email protected]</a>> wrote: >> >> Yeah, I was a friend of friend of Bob Forward and I once had dinner with >> him. At the time though he was pushing anti-matter powered spaceships; >> which I thought was a crank idea. >> >> Brent >> >> On 6/16/2016 5:18 AM, Hans Moravec wrote: >>>> On Jun 15, 2016, at 23:48 , Brent Meeker <<a >>>> href="mailto:[email protected]";>[email protected]</a>> wrote: >>>> >>>> When you look somewhere new, you see new things. To bad Joe Weber didn't >>>> live to see this. >>>> >>>> Brent >>> And Bob Forward (Robert L. Forward), who was once Weber's grad student, and >>> continued gravity related research and publication until his death in 2002. >>> >>>> On 6/15/2016 7:25 PM, John Clark wrote: >>>>> After analyzing the data from LIGO's brief engineering run the scientists >>>>> there just announced they have found a second Black Hole merger. A Black >>>>> Hole of 14 solar masses merged with one of 8 solar masses and produced a >>>>> Black Hole of 21 solar masses and gravitational waves with 1 solar mass >>>>> of energy. It happened 1.4 billion light years away, about the same >>>>> distance as the first merger that was announced a few months ago, but the >>>>> signal was weaker because the Black Holes involved were smaller (14 and 8 >>>>> vs 36 and 29) and also because the orbit of the Black Holes was more edge >>>>> on relative to the Earth. Edge on means the signal is weaker but it also >>>>> means it's easier to determine the spin, so unlike the first detection >>>>> this time we can say with certainty that at least one of the Black Holes >>>>> was spinning. And although weaker the signal lasted longer, almost a full >>>>> second versus a fifth of a second the first time because being smaller >>>>> the holes generated waves with higher frequencies that LIGO is more >>>>> sensitive to. >>>>> >>>>> And they're looking at at least one other suspected merger but they're >>>>> only 85% certain it's real and that's not good enough to claim discovery, >>>>> but there may be others so there may be a third announcement before long. >>>>> Not bad for observing for only 18 days. The instrument was running at >>>>> only one third power but that was still good enough to determine that 2 >>>>> mirrors 4 kilometers apart had changed their distance by less than a >>>>> billionth of a nanometer. I can't wait for September when the 2 LIGOs get >>>>> back online and are joined by a third detector, VIRGO in Italy. >>>>> >>>>> <a >>>>> href="http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.241103"; >>>>> >>>>> target="_blank">http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.241103</a> >>>>> >>>>> John K Clark >>>>> -- >>>>> You received this message because you are subscribed to the Google Groups >>>>> "Everything List" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>> email to everything-<a >>>>> href="mailto:[email protected]";>[email protected]</a>. >>>>> To post to this group, send email to everything-<a >>>>> href="mailto:[email protected]";>[email protected]</a>. >>>>> Visit this group at <a >>>>> href="https://groups.google.com/group/everything-list"; >>>>> target="_blank">https://groups.google.com/group/everything-list</a>. >>>>> For more options, visit <a href="https://groups.google.com/d/optout"; >>>>> target="_blank">https://groups.google.com/d/optout</a>. >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "Everything List" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to everything-<a >>>> href="mailto:[email protected]";>[email protected]</a>. >>>> To post to this group, send email to everything-<a >>>> href="mailto:[email protected]";>[email protected]</a>. >>>> Visit this group at <a >>>> href="https://groups.google.com/group/everything-list"; >>>> target="_blank">https://groups.google.com/group/everything-list</a>. >>>> For more options, visit <a href="https://groups.google.com/d/optout"; >>>> target="_blank">https://groups.google.com/d/optout</a>. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to everything-<a >> href="mailto:[email protected]";>[email protected]</a>. >> To post to this group, send email to everything-<a >> href="mailto:[email protected]";>[email protected]</a>. >> Visit this group at <a >> href="https://groups.google.com/group/everything-list"; >> target="_blank">https://groups.google.com/group/everything-list</a>. >> For more options, visit <a href="https://groups.google.com/d/optout"; >> target="_blank">https://groups.google.com/d/optout</a>. -- You received this message because you are subscribed to the Google Groups "Everything List" group. 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