Recent content by AA Institute

Hawking radiation is still too theoretical to apply to your theoretical idea on the Sun, imho. There was another poster who I just answered had a question about the solar wind: https://www.physicsforums.com/showthread.php?t=158539

I can answer your question in part, but I expect you'll have to try the astronomy or solar astronomy links from google. 1. Typically at around 400 km/sec 2. Depends on the solar activity cycle, which varies over roughly 11 years 3. Pass 4. Hmm. Intersting question! I hope there are...

I know what you're thinking... No, it won't be like 'Silent Running' where the guy blew himself to kingdom come - :smile: No, in my case, the Pu-239 is going to trigger a revival sequence for crew in hibernation <cut - don't want to give the story away!> :smile:

I'll take the Plutonium 239 and use its 'quarter-life', i.e. when 75% of the original mass has been depleted through radioactive emissions, the timing switch will be triggered... exactly 48,200 years later. :wink:

Is it possible to identify such an isotope? What are my choices if I wanted such a long half-life product. (Ultimately, I need it to activate a timing switch...!) :smile: Thanks, anyone for any pointers. AA

Hi, Is there a general extrapolation formula (or other *simple* quantitative technique) for projecting values in a given series? I have these numbers in a certain series sequence: x=1, y=-3.80, x=2, y=-4.15, x=3, y=-4.47, x=4, y=-4.77, x=5, y=-5.05, x=6, y=-5.27, -5.40 Question is...

See this article on asteroid 1 Ceres:- http://www.selsyn.co.uk/pkent/p/3c31p2.html There is a series of references at the foot of that page, of which D. McNally's book Positional Astronomy is one I read ages back, and I would recommend as a good guide.

Okay, I am beginning to get the picture with all the different viewpoints in Lorentz Contraction and the various field equations that one can work with to give different perspectives. But ultimately, what I am looking for is the formula or rule for computing the apparent angular width...

From this page: http://math.ucr.edu/home/baez/physics/Relativity/SR/mass.html The relativistic mass increases according to the equation: mr = m0 /sqrt(1 - v2/c2) So I want to know, is the equation for Lorentz contraction *exactly* the same as this? To put this another way, the...

Does the equation for Lorentz contraction stay exactly the same when quantifying the 'mass increase factor' at relativistic speeds? Further, when one moves at close to light speeds, the view of the surrounding universe seen from the ship is distorted into a circular window. Would the...

The exploration data gathered so far is looking really promising, and will probably take many years of analysis to fulfill the mission's full potential. Climbing the hills obviously adds an extra dimension to all the surface geology, and is great. But if the terrain had offered depression...

http://www.spaceflightnow.com/news/n0509/01marsrovers/ Astounding to think the rovers only had a such a limited life span expectation to begin with, yet they are still going so strong nearly two years on. I wonder if they could carry on for a few more years yet?! After all the Martian...

Thanks. I suppose everything will depend upon how much power consumption will take place. Since the interior surface area of my ark will be of approx. 600 square kilometres, and the population will be around 3,000 people (on average) along the 50,000 year long journey (!), I wonder if there are...

Hi, I have a couple of more questions for all the kind and learned people here. Are there any (approx) benchmarks for quantifying how much uranium ore (kg) is going to be rquired in order to generate a given amount of electricity over a specific length of time? Let me clarify...

An article about the likely magnitudes and feasibility of terrestrial sized rocky planets orbiting in the habitable zones in the Alpha Centauri system: (link removed)AA http://www.publishedauthors.net/aa_spaceagent/