Search found 32 matches

by Northerner
Sat Sep 30, 2017 12:25 pm
Forum: Telescopes and instruments
Topic: Binoculars.
Replies: 7
Views: 3695

Re: Binoculars.

Thanks for the reply.
I'm inclined to buy a 10x50.
Do the 10x50 binoculars tend to have the same weight or can one buy lighter versions with the same magnification.
Note I also want them for general use.
by Northerner
Fri Sep 29, 2017 9:24 am
Forum: Telescopes and instruments
Topic: Binoculars.
Replies: 7
Views: 3695

Binoculars.

Probably this question has been asked before, but no harm in asking again. Any opinions on decent binoculars (perhaps the make) to be used for general purposes plus astronomy. Should I get an 8/40 or a 9/50 or is that purely down to personal preference? Do the 10/50's tend to be fairly heavy for use...
by Northerner
Fri Sep 09, 2016 9:56 am
Forum: General chat
Topic: Pale Blue Dot.
Replies: 0
Views: 1336

Pale Blue Dot.

I mentioned, some time ago, I intended to buy a print/poster of Sagan's pale blue dot.
Afterwards I forgot to buy!
I probably asked this before, but any further suggestions on where to buy this item would be welcome.
Also, what exactly is the difference between a print and a poster?
by Northerner
Sat Mar 19, 2016 4:27 pm
Forum: General chat
Topic: Pale Blue Dot.
Replies: 1
Views: 1788

Pale Blue Dot.

Does anyone know where I can get a copy of the famous photograph of the Earth, inspired by Carl Sagan and taken by Voyager1, from a distance of 6 billion miles?
by Northerner
Wed Oct 07, 2015 10:30 am
Forum: General chat
Topic: Kip Thorne
Replies: 3
Views: 1911

Re: Kip Thorne

Yes, it's a superb book. I'd say it's mostly current theory even though it is 20 years old - the basics have endured. I'm sure there are some things that are missing but the most important are there. Perhaps it has been updated since it was first published? I bought the paperback but when I conside...
by Northerner
Thu Oct 01, 2015 4:03 pm
Forum: General chat
Topic: Kip Thorne
Replies: 3
Views: 1911

Kip Thorne

Has anyone read "Black Holes and Time Warps" by Kip Thorne?
I note it was published in 1995.
Does this mean it is likely to be dated?
Any other comments?
by Northerner
Wed Sep 16, 2015 12:27 pm
Forum: General chat
Topic: Astronomy Books.
Replies: 6
Views: 2095

Re: Astronomy Books.

mike a feist wrote:Once one gets beyond the basic books, there does seem to be a wide gap till one gets to academic text books.
That is really what I thought!
Probably it is difficult to produce, or write, such a "half way" book.
by Northerner
Wed Sep 16, 2015 8:11 am
Forum: General chat
Topic: Astronomy Books.
Replies: 6
Views: 2095

Re: Astronomy Books.

There's a welter of introductory astronomy books these days, so it's difficult to suggest what to read. Some people recommend "Turn Left at Orion" for starters, although it's better suited to the observer, if that's what you intend to do. I have heard of this book and may buy it sometime. At presen...
by Northerner
Tue Sep 15, 2015 10:52 am
Forum: General chat
Topic: Astronomy Books.
Replies: 6
Views: 2095

Astronomy Books.

I intend to buy a good general recently published book on astronomy. Ideally I would like to have a couple of chapters on basic "practical" astronomy, but this is probably not essential. I have thought of buying "From here to Infinity: The Royal Observatory Greenwich guide to Astronomy" by John and ...
by Northerner
Fri Aug 17, 2012 9:21 am
Forum: Space exploration
Topic: Destination Mars ( video ) ..
Replies: 20
Views: 7751

Re: Destination Mars ( video ) ..

It seems the crater is 154 km across. The central peak 18,000 ft high and the southern crater wall may be less than 15,000 ft high. The nearest crater wall is VERY roughly 15km distance, but it landed 2.4 km away from its target and I have no idea of the distance to the mountains shown in the photo...
by Northerner
Sun Aug 12, 2012 7:27 am
Forum: Space exploration
Topic: Destination Mars ( video ) ..
Replies: 20
Views: 7751

Re: Destination Mars ( video ) ..

Great view from inside Gale crater!
What is the distance from the Rover, as shown in smerral's image, to the base of the crater rim?
by Northerner
Sat Jan 21, 2012 9:24 pm
Forum: General chat
Topic: Sky at Night theme music.
Replies: 9
Views: 3332

Sky at Night theme music.

Years ago I was watching an edition of the programme and Patrick Moore mentioned that the most common question, from viewers, was about the the music at the beginning and end of the programme. I was certain he said the composer was Rachmaninoff! Today I found out the music is the first movement, cal...
by Northerner
Sat Jul 30, 2011 12:43 pm
Forum: Space exploration
Topic: Colonise space or perish ..
Replies: 20
Views: 8682

I'm sure Pascal was an important thinker, in 17th century Europe, but I don't quite see why you believe his views are so vital to this thread. I suppose there are individuals who are "terrified" by the immensity of space and the universe. There are others (I was going to say "morons" but that would ...
by Northerner
Thu Jul 28, 2011 11:28 am
Forum: Space exploration
Topic: Colonise space or perish ..
Replies: 20
Views: 8682

I'm sure our early human ancestors knew that reaching the stars was impossible, but I am very sure looking, at the heavens, filled them with a sense of wonder and curiosity about the objects they saw there. I am certain that the Cold War was vital in determining the timing of what you call the "Spac...
by Northerner
Wed Jul 27, 2011 1:56 pm
Forum: Space exploration
Topic: Colonise space or perish ..
Replies: 20
Views: 8682

I don't blame Hawking for having expressed pessimism about humanity. I believe we have achieved so much and have the potential to achieve almost anything but it could so easily go wrong. Even if we do not destroy ourselves future events/problems could seriously affect our technological civilisation....