# Gian

Senior Members

136

1. ## Steering to the stars

Thanks Swansont. What is 'displacement?' ๐
2. ## Steering to the stars

Apparently the Orion Project for nuclear powered spaceflight asserted that by this method with an acceleration of 1G an Orion spaceship could attain a speed of 10% of the speed of light (c.) Mathematically, how do I work out 1. the length of time it would take to get from 0 to a speed of c/10 (ship's time,) and 2. what would be the distance travelled in that time? Cheerz GIAN๐

Thanks ๐
4. ## Pigs might fly on Titan?

I picture explorers creating giant igloos to use as greenhouses, with methane-powered heating to room temperature and melting water ice for crops and pasture, and also extracting oxygen from water (electrolysis?) to make breathable air. But yes I suspect there wouldn't be enough 'goodies' on the Titanian surface to grow stuff, so the astronauts would have to bring their own compost. Can you define magnetosphere and explain why it would be a problem for animals please? (I'm a novice at science) Thanks GIAN ๐
5. ## Pigs might fly on Titan?

When explorers eventually reach Titan, I suppose they could take some farm animals with them which if they had enough to eat would create manure, although I'm not sure how pigs and cattle would get on in the low gravity (flying pigs?) But would there be enough minerals lying about on the surface to use as soil to grow crops? Would there be enough nutrients in it? Titanian wheat and potatoes?๐
6. ## Where's Evolution taking us?

On the other hand, could biology one day become machines? Eg, scientists could design biological organisms to do what machines do for us now? A biological motorcar which can drive passengers around on wheels at upto 100mph but also eats grass for fuel?
7. ## Where's Evolution taking us?

The natural human lifespan has extended from the lifespan of the first life forms. Is the extension of lifespan a natural consequence of evolution and will it continue? What I mean is, is it at least possible with natural selection that vast organisms something like dinosaurs could evolve again?
8. ## Where's Evolution taking us?

Three questions 1) If the first life forms c 4y.billion ago lived about 24 hours (?) and we now live about 80years, in another 4y.billion will life expectancy continue to increase in a straight line and our descendants will have lifespans of 2.5y.millon?? If so it will certainly make intergalactic travel more practical! 2) Is our species H.Sapiens continuing to evolve? Will our descendants become a new species or species? 3) Will the natural course of evolution without human agency cause the dinosaurs or something like them to evolve again in the far future? Cheerz GIAN ๐

Thanks ๐
10. ## Nuclear Star Trek

If we can create nuclear bombs 1000x hiroshima, wouldn't it be fairly simple to use it to power space ships which could accelerate to the point where a trip to the outer planets would take days rather than years? Is it true that this is already quite possible, but governments won't let us do it because of the potential dangers of nuclear accident? Cheerz GIAN xx
11. ## solar panel salvation

inow and swansont Well yes, hopefully sunlight could be turned into energy in another form eg motion and/or light. Yes there would be waste heat but presumably not as much as if the sunlight energy had not absorbed at all. And yes a percentage of the 'harvested' sunlight would also be reflected away from the Earth. Presumably if if it was done on a big enough scale there would be a net cooling of the Earth, plus an additional reduction of CO2-producing forms of energy production? cheerz Gian
12. ## solar panel salvation

If there were enough solar panels installed across the world, besides give us lots of cheap energy would this also reverse the effects of global warming? If so, how many would be needed? cheerz Gian
13. ## Jumbo Jet spaceships to the outer planets

Cheerz Mr Strange. Well at least someone could produce a generic basic probe with additional components which could be added as required according to the nature of the mission. Thanks for the SpaceX tip I'll check them out GIAN x
14. ## Jumbo Jet spaceships to the outer planets

At the BIS Christmas lecture in December John Zarnecki spoke about how he and his team designed and built the Huygens probe for Titan from scratch. No wonder it took so long and was so expensive. Why can't someone design a generic spaceprobe which can be used anywhere and built on a production line like Boeing airliners? Has anyone tried this? Cheerz Gianโบ
15. ## Exploring Titan

Spoke to Prof John Zarnecki after a lecture he gave about Titan last month and he said that yes astronauts on Titan could use the nitrogen and there would be enough water ice to extract oxygen to make breathable air. He also said that there will be big waves and it will be possible to go surfing on Titan!โบ
16. ## artificial gravity

Science says (I think) we can make artificial gravity in space using a centrifugal force on the inside of a rotating circular structure. If so, anyone know what maths and physics I need to calculate speed of rotation for a given radius of a circular spaceship? Cheerz GIAN

cheerz
18. ## Isotope Mania

Hydrogen-1 (protium) is an isotope of Hygrogen yeah? It has one proton in the nucleus and one circling electron? So is Protium just another word for hydrogen itself?

THANKS!!!!! Got it (I think) 1/2x1/2=1/4 (viz to the power2) x1/2= 1/8 (to the power3) x1/2= 1/16 (to the power4) x1/2= 1/32 (to the power5) So ans=5 Is there a particular formula I should use though? Or is working through it methodically number by number the right way to do it?

THANKS!!!โบโบโบ

Excuse my ignorance, but with an equation like this; 32 x 0.5x = 1 is there a formula I can use to calculate the index number x ? cheerz GIAN

Excuse my complete ignorance, but I'm new to this. I have a question from a GCSE physics book as follows;"Cobalt-60 is a radioisotope made by placing cobalt in a nuclear reactor. It has a half-life of 5 years. The activity of a piece of Cobalt-60 is 32.0 kBq. How long would it take to fall to (a)16.0kBq (b)1.0 kBq?"I guess question (a) would be five years, or one half-life; but what maths/ formulae should I use to calculate (b)? Of course I guess I can get it by just counting down multiplying by 0.5 each time, but I wondered if there's an algebraic formula I should use for this? (kBq is kilo-bequerels) cheerz GIAN

THANKS!
24. ## Exploring Titan

a few further queries I mentioned earlier (1) I guess there's wind and tidal forces on Titan so maybe we can walk along the beach of one of the methane seas with methane washing up and down? (2) If liquid methane has less than half the density of water, would it still be possible to have powered craft which could float on the surface of Titan's lakes? (3) Could explorers go hang-gliding? Or maybe even a nanolight powered by methane? (4) Presumably with all the methane about, power won't be a problem. When explorers get to Titan I guess temperature suits would have to be powered (unless NASA has an insulation fabric which could withstand โ179 ยฐC?) (5) As the atmosphere is mostly nitrogen, presumably explorers would only have to take oxygen with them and have a mechanism for mixing it to make breathable air? (6) And given that there's water on Titan, would it be possible to mechanically extract enough oxygen to add to the nitrogen to make breathable air? altho I guess it would take a helluva lot of water.... cheers GIAN
25. ## swimming on Titan

Not at all, although I've no idea of the answer!
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