Search found 136 matches

by Earthshine
Fri May 23, 2008 8:59 pm
Forum: Absolute beginners
Topic: Can I remount a dobsonian telescope in an equatroial mount?
Replies: 14
Views: 3341

You could yes, the problem could be the actual mounting of the scope onto the alt-axis. It puzzled me, after reading a couple of threads about mounting a dob-mounted reflector onto a equatorial, that there are proprietary fixings to allow you to do this easily, but there doesn't appear to be anythi...
by Earthshine
Fri May 23, 2008 7:02 pm
Forum: Absolute beginners
Topic: Can I remount a dobsonian telescope in an equatroial mount?
Replies: 14
Views: 3341

Now here's my burning question... Can you get a separate dobsonian mount for a reflector? I must confess I have never seen a dobsonian mount advertised without a resident newt - unlike EQ mounts where they are very often sold solo. But can´t you quickly knock up a dobsonian mount with a few sheets...
by Earthshine
Fri May 23, 2008 12:09 pm
Forum: Light pollution
Topic: Black Night
Replies: 12
Views: 6755

The only times I've seen the Milky Way with the unaided eye were:

1. Just outside Newquay, 1981.
2. On holiday in Kenya, about 20 miles south of Mombasa, Sept 1996.
by Earthshine
Fri May 23, 2008 12:00 pm
Forum: Astrophysics
Topic: Photons or Quarks first?
Replies: 17
Views: 10726

It seems somehow not logical to suggest that the building blocks of nature end with preons too. In fact, it has been suggested that size is infinate and there is no smallest particle. Endless inner space is the same argument as endless infinate outer space. Also the fact that innerspace eventually ...
by Earthshine
Fri May 23, 2008 11:56 am
Forum: Absolute beginners
Topic: Can I remount a dobsonian telescope in an equatroial mount?
Replies: 14
Views: 3341

Now here's my burning question...

Can you get a separate dobsonian mount for a reflector?
by Earthshine
Fri May 23, 2008 11:51 am
Forum: Gallery
Topic: M57 Ring Nebula in Lyra
Replies: 9
Views: 1524

Very nice pic :wink:
by Earthshine
Tue May 20, 2008 6:48 am
Forum: Astrophysics
Topic: Time Travel and Time Travel Paradoxes
Replies: 63
Views: 24437

In the scenarios being talked about, something does change to keep the speed of light invariant and that is the frequency of light. Einstein postulated something called the transverse doppler effect whereby the change in 'atomic clock speed' (as it was earlier put) between two frames of reference i...
by Earthshine
Sat May 17, 2008 10:08 pm
Forum: Space exploration
Topic: Is there a mission planned to Europa?
Replies: 4
Views: 3245

Davej wrote:Hi,
This might be helpful :)
ATB
Dave
Very interesting.

Thx davej :)
by Earthshine
Sat May 17, 2008 9:00 pm
Forum: Space exploration
Topic: Is there a mission planned to Europa?
Replies: 4
Views: 3245

Is there a mission planned to Europa?

This, I feel offers our best chance of finding life in our solar system.
by Earthshine
Sat May 17, 2008 8:56 pm
Forum: Astrophysics
Topic: Do they exist?..
Replies: 17
Views: 8099

Re: Do they exist?..

Much of our everyday behaviour is governed by inductive reasoning. There comes a point when the conclusions are as close to fact as we are going to get. Good point; there is not a line where inductive reasoning stops and reality starts. How likely does a thing have to be to be real? Ultimately ther...
by Earthshine
Thu May 15, 2008 6:29 pm
Forum: Gallery
Topic: Massive prominence eruption 14.5.08
Replies: 4
Views: 841

Had a look today and saw something big. It was at 4-o-clock as you view through the scope, so I guess that would mean 10-o-clock as you look at the sun. A prominence appeared to have detached itself from the disk at 5-o-clock and a small flare just below it (as you look through the scope).

Nice.
by Earthshine
Thu May 15, 2008 11:37 am
Forum: Astrophysics
Topic: Understanding the universe.
Replies: 11
Views: 6469

joe wrote:I'd guess the double-slit experiment.
Yep, its the experiment where you can easily prove that light is a particle, but also that it behaves like a wave because of superposition causing peaks and troughs rather like water waves show on the surface of a pond.
by Earthshine
Thu May 15, 2008 11:31 am
Forum: Gallery
Topic: Massive prominence eruption 14.5.08
Replies: 4
Views: 841

Wow! :shock:

Time to get my PST out again :D

Hoping the sky remains clear until about 6.30pm at least.
by Earthshine
Wed May 14, 2008 6:31 pm
Forum: Astrophysics
Topic: Understanding the universe.
Replies: 11
Views: 6469

Yep. I read Jim Al-Khalili's book on Quantum Theory. It is very good.

My favourites are the experiment that proves light's wave-particle duality, the Wavefunction and the Uncertainty Principle.

Gripping stuff :shock:
by Earthshine
Tue May 13, 2008 6:25 pm
Forum: Gallery
Topic: The amazing, shape-shifting prominence of May 7th 2008
Replies: 6
Views: 1169

I think I saw this prominence today through my PST (at least I saw one of a very similar shape). It was quite good seeing this afternoon.