Search found 136 matches

by Earthshine
Fri Jun 20, 2008 7:07 pm
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

I think it's clear that he knows this. The interest (the "bit of fun" if you like) lies in imagining extreme situations that would put it to the test. I believe Einstein himself was in the habit of doing this. :wink: Thank you joe. I think they were called 'gedanken'. I have done this a lot since r...
by Earthshine
Fri Jun 20, 2008 11:20 am
Forum: Astrophysics
Topic: Consciousness, the edge of the universe?
Replies: 83
Views: 29981

whilst I am yet to be convinced, I admit to being intrigued.

How does all this fit into the 'block universe' theories?
by Earthshine
Fri Jun 20, 2008 7:42 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

The question needs to be approached from a sub atomic level. We see the rod as a whole object spinning around from its axis. The atomic particles and sub atomic particles within the rod see it differently and from a more selfish point of view. Centrifugal force would play a part in this, I would im...
by Earthshine
Thu Jun 19, 2008 11:56 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

I think this problem has been sufficiently and correctly answered. Sorry I spoke. The (hopefully a bit of fun didn't last very long then...) :lol: I really hope I don't stick in the mud so firmly when I get a bit older :wink: Hi Earthshine, Don"t apologise for speaking :) A bit of fun doesn"t go am...
by Earthshine
Thu Jun 19, 2008 11:19 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

Moving on...the only argument I can see for this happening is that the rod will gain mass according to general relativity and thus makes the rod more difficult to move - at light speed the end of the rod has infinite mass and so requires infinite energy to move it. But is this not only an apparent ...
by Earthshine
Wed Jun 18, 2008 8:18 pm
Forum: General chat
Topic: New hi-res image from Hubble
Replies: 7
Views: 1538

Yeah. Thanks for that Steve. Mind-boggling pic. Took about 3 mins on my works compy.

The parts of the image that get me are those distant orange galaxies, some of which look like UFOs :shock:
by Earthshine
Wed Jun 18, 2008 11:47 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

Back on topic. I agree with most, if not all thats been said. I wasn't trying to say something against accepted physics, just coming up with an odd situation that may throw up a few paradoxes. BTW, I meant to say that our rod is made of a very strong, unbreakable material. With this in mind, I assum...
by Earthshine
Wed Jun 18, 2008 11:27 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

..or even Čerenkov. Or even черенков. Everyone hates a smartass. No they don"t (it was just an helpfull response) Dave Eclipse is showing that he knows cyrillic. Fortunately I know cyrillic too as my wife is Russian :lol: So we're not the only smartasses here :P He is correct btw :wink:
by Earthshine
Tue Jun 17, 2008 12:22 pm
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

I think you know the answer already. Roughly speaking, the rod will bend, rather than move as a whole. The force applied to one end of the rod will ripple along its length. It couldn't happen instantaneously because nothing travels faster than light. Ok. Lets go back a little and assume we are only...
by Earthshine
Tue Jun 17, 2008 11:38 am
Forum: Astrophysics
Topic: Brain Teaser (hopefully a bit of fun)
Replies: 27
Views: 12371

Brain Teaser (hopefully a bit of fun)

Hypothetical situation (assume that everything can actually be done): A long, straight, metal rod is made out in space. Its length is 1.8 million miles. A machine is constructed to rotate the rod at a target rate of 1 revolution per minute. Now, the circumference subtended by the rod is 2 x pi x 1.8...
by Earthshine
Thu Jun 12, 2008 11:23 am
Forum: General chat
Topic: A planned visit to the Sun in 2015
Replies: 5
Views: 1437

I read about this in Astronomy Now magazine a few months ago.

The shield will be made of carbon-carbon material and will always point towards the sun like an umbrella to prevent all the equipment from melting.
by Earthshine
Thu Jun 12, 2008 11:14 am
Forum: General chat
Topic: Now it's a Plutoid..
Replies: 32
Views: 5553

What was wrong with 'dwarf planet'?

So what else would be considered a plutoid? Ahh I read on... Eris. :roll:

If Pluto had been named Andrew, would it have become an Android ? :lol:
by Earthshine
Wed Jun 11, 2008 6:55 am
Forum: General chat
Topic: A Forum Question
Replies: 37
Views: 6743

Already? I have been on this site since it opened. However I am coming around to feel that it is just too easy to type something in in all good faith and with the best intentions, having it misconstrued and have it upset someone. Perhaps it is best not to do so at all. Unfortunately it is quite add...
by Earthshine
Tue Jun 10, 2008 6:15 pm
Forum: General chat
Topic: A Forum Question
Replies: 37
Views: 6743

Re: A Forum Question

OK you need to register to be able to take an active roll on this Forum. However can you actually de-register? maf Why would you want to de-register? If you don't want to post any more, then don't. The problem for the admins if you want your account completely deleted, is that there are all your po...
by Earthshine
Tue Jun 10, 2008 7:03 am
Forum: Absolute beginners
Topic: New to the forms and looking to buy first telescope
Replies: 24
Views: 6253

You first need to decide what you prefer looking at. For planets: A refractor/SCT or Mak. For deep sky viewing (clusters, galaxies etc): A reflector. If you want a happy medium, a reflector with a large focal length, but then the kit starts to get heavy. Celestron and Skywatcher do nice ranges of bo...