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Topics - lunar11
« on: 03/05/2013 22:46:45 »
No matter how powerful we make our telescopes, am I right in stating that we can never see the edge of the Universe because of 'inflation' that occurred near the beginning of the Universe. Am I right? Can anyone elaborate?
I have a fear of flying, primarily because of turbulance. In the news recently it has been mentioned that there will be an increase in turbulance as regards commercial flight. Is turbulance dangerous? could it cause a plane to crash?
The standard model states that particles such as electrons are fundamental. They are not made of any other constituents. String theory states that the electrons are made of strings that vibrate. Has there been any thoughts about what strings could be made of, assuming the theory is acceptable?
« on: 29/12/2012 14:08:20 »
The Moon appears small when viewed high up in the sky. The Moon appears vary large when viewed near the horizon. This is due to an optical illusion.
Our brain may be fooled, but surely a camera should show the actual size of the Moon at all times. Why is the camera being fooled too?
« on: 29/12/2012 14:02:10 »
Can Solar eclipses happen during sunrise and sunset? If so, would the Sun and Moon still appear large (due to optical illusion)?
When I am driving my car and approach traffic lights when they are red, I often change down gears and allow the engine to 'do the braking' hence preserving my brakes. However, when changing down gears and subsequently slowing down the RPM (revolutions per minute) increase, though I am not pressing the accelerator. Will this still increase my fuel consumption, eventhough I am slowing down.
Should I avoid doing this practice and just apply the brakes earlier and wear them out sooner?
I heard that on average the human heart beats 3 billion times.
Lets say a person exercises everyday for an hour and the pulse rate increase to 120 beats for the entire hour. This means that the 'allocated' 3 billion beats is been reached quicker, and so the life-span would decrease.
However, exercise is good for you. What have I missed here?
« on: 29/03/2012 21:29:46 »
Special theory of relativity states that 'moving clocks run slow'.
I can appreciate this but what I would like to know is, do the mechanism of the clock actually slow down?
If the clock slows down then don't the specification of the components have to be changed.
There is no 'centre of the Universe'. All space began from a singularity. Space is expanding just like a balloon been blown up.
When the Hubble telescope sees far in the distance a galaxy that is say near the edge of the Universe, it is highly redshifted and travelling at nearly the speed of light; then does that also mean that with respect to the galaxy in question, we too are near the edge of the Universe, and that we too are highly redshifted and travelling nearly at the speed of light?
« on: 26/12/2011 12:52:06 »
Recently two Earth-like planets were discovered, which did once lie in the 'habitable-zone', but now are too hot.
My question is lets say that there was intelligent life on one of these planets once, and that they were sending radio waves in all directions, including our direction. It would take about a 1000 years for the signals to arrive to Earth. Would these signals still be arriving even if the life-forms died out millions of years ago.
I could be thinking Monolith (as in Space Odyssey 2001)
« on: 30/04/2010 20:56:54 »
I know that beta-minus decay involves a neutron converting to an electron (beta) and an anti-electron-neutrino; in fact a down quark becomes an up quark and the W‾ boson provides momentum/energy to the beta and the anti-neutrino, but, how does the electron and anti-neutrino originate?; they were not inside the neutron.
Imagine i am standing outside a Black Hole and my cat falls in.
The cat would find itself fall into the black hole and be killed (dead).
I on the other hand would see the cat falling in but never reach the
centre of the Black Hole (or the singularity). So, according to me the
cat is not dead (alive).
How can this be; is the cat dead or alive?
« on: 09/01/2010 19:54:59 »
Gamma rays are very short wavelength EM waves that are very energetic (since E= hf).
Thay are able to penetrate concrete upto a metre in depth.
Radio waves are long wavelength are far less energetic. My question is how do they penetrate brick walls. E.g. I can listen to the radio in a room with no windows, but just solid walls.
All the planets have Moons in the Solar System except Mercury and Venus (nearest planets to the Sun.
Is there a reason for this or is it just a coincidance?
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