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Feb
25
comment Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star?
thanks! so, if you could convert a sun-like star with only the last billion years left in it, into a dwarf, somehow, presumably keeping the hydrogen and getting rid of the heavy stuff, you WOULD at least get a huge increase in longevity.
Feb
25
comment How fast is the Earth-Sun distance changing
This is kind of a 'wild' idea, but if we assume liquid water on earth for the last ~3 or 4 billion years, yet the sun's output was weaker 3 billion years ago, does that let us put some kind of bound on how much closer the earth would likely to have been? Or are there too many factors (greenhouse gases, etc) which would obscure the result too much?
Feb
25
comment How accurate are Mayan astronomical “ephemerides”?
Yeah, I don't want to come off like a jerk, but it's far more likely they designed it to work in their time, for their equinoxes. which still takes a lot of knowledge and precision. It just still works. kudos to them for building it right in the first place though...
Feb
25
comment How to Generate a Strong Electromagnetic Field?
I think he's looking for strong field AND low weight -- im guessing the magnets are too heavy...
Feb
25
comment Break speed of light with infinite mass
if you're picking up the mass, then I don't think your idea applies, since the mass you grab would be essentially not moving (compared to your almost-lightspeed ship). picking it up would slow you down, unless you spent even more fuel. BUT, maybe if you could carry infinite fuel, the accellerated mass of the fuel in question might help. Course then the problem is how to start -- if your ship weighs infinite pounds, how do you push it hard enough to move it at all?
Feb
25
accepted Energy to move The Earth to mars' orbit?
Feb
25
answered Energy to move The Earth to mars' orbit?
Feb
17
comment Energy to move The Earth to mars' orbit?
ok a lookup for kj to horsepower shows that 634 kj/s is under 1000 horsepower. so, one Bugati veyron, if running for a billion years and somehow able to push to add to the earth's orbital motion, would do it. I wonder if we have a billion years worth of gasoline?
Feb
17
awarded  Commentator
Feb
17
comment Energy to move The Earth to mars' orbit?
@jinwee. ok. using wikipedia values: <br>G = 6.67x10-11 <br>M sun = 1.9891 x 10^30 <br> m earth = 5.97x10^24 <br> r1 = earth-sun dist = 149598261 km. <br> r2 = mars-sun dist = 227939100 km <br> I got E earth = -3.542 x 10^ 22 and E mars = -1.52 x 10^ 22. so, roughly 2 x 10^ 22 joules? <br> over 1 billions years at 365 / 24 / 3600, I converted that down to 634195 j/sec <br> But what is 634 kj per sec? seems like a small amount to move a PLANET ?
Feb
17
comment Energy to move The Earth to mars' orbit?
@jinwee. ok. using wikipedia values:
Feb
17
asked Energy to move The Earth to mars' orbit?
Oct
7
comment What Problems for 50 year space probe to Alpha Centauri?
Thanks. sorry that I got the scale of time so wrong. My idea was to figure out what might happen for a low-cost small mass robot probe, something that we can afford to just launch for the cost of a handful of geosynch comminucation satellites.
Oct
7
comment What Problems for 50 year space probe to Alpha Centauri?
Thanks! I know ion thrust can run for a very long time, but I really had no idea of what kind of velocity you end up with. good to know we don't need to worry about the transmision or power supply at least.
Oct
7
comment What Problems for 50 year space probe to Alpha Centauri?
Thank you for all of the answers. Also, I apologize for not trying to run some numbers on what speeds an ion probe might get to, and see if it came up with decades or centuries.
Oct
7
accepted What Problems for 50 year space probe to Alpha Centauri?
Oct
4
revised What Problems for 50 year space probe to Alpha Centauri?
added 178 characters in body
Oct
4
asked What Problems for 50 year space probe to Alpha Centauri?
Dec
16
accepted Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star?
Dec
8
comment Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star?
@Jerry: I was thinking that you would have an existing star system with a stellar mass star as the starting point. But its probably way less effort to move a planet into place around an existing dwarf, than it is to "peel apart" a star into several dwarfs.