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Hyperstar

Hello.
Has anyone had any experience using a hyperstar lens on a Schmidt Cassegrain telescope? Are they difficult to use, are the results good? Any information would be gratefully received.
Thanks
Dave
Read more : Hyperstar | Views : 2834 | Replies : 7


The Sun: Why Doesn't It Shrink?

The Sun is supposed to be a giant ball of compressed hydrogen gas. The compression makes it operate as a kind of thermonuclear reactor, continually using up the hydrogen as fuel.

If this is true, the hydrogen in the Sun must be getting "used up" all the time. So shouldn't we see some sign of this, for instance by observing a shrinkage of the Sun? Yet we don't see this. The Sun seems to stay ...
Read more : The Sun: Why Doesn't It Shrink? | Views : 3723 | Replies : 17


Universe too big or too young?

Hi, would be interested to know what explanations astrologers have for the following anomaly- If our universe is estimated to be around 13.8 billion years old (time from big bang to present day), and the size of the observable universe is estimated at 92 billion light years (so its 46 billion light years from the center to the edge) ... and if both those things are true then the average speed of the matter now ...
Read more : Universe too big or too young? | Views : 2102 | Replies : 3


Dark Matter Black Holes?

On the basis that Dark Matter exhibits the property of mass is there a theoretical possibility that dark matter could therefore ultimately form a Singularity and if so how might this present itself?

Thanks
Read more : Dark Matter Black Holes? | Views : 2558 | Replies : 6


Expansion speeding up

Could the increasing rate of expansion of the universe be explained by either the universe slowing down at an increasing rate from the outside in or similarly could it actually be imploding at increasing rate from the outside in. Has it actually been proven that everything is moving away from each other?
Read more : Expansion speeding up | Views : 5008 | Replies : 41


standard candles and donor chemistry

As I understand standard candles they are binary stars where the dying partner is stealing mass, when it hits (always the same) critical mass it explode - same mass = same brightness...

...but what of the donor chemistry, could that not effect the "colour" of the light or even the temperature of the explosion? Would that then not effect the distance measurement because the brightness would be even slightly be effected ?

On a slightly ...
Read more : standard candles and donor chemistry | Views : 1985 | Replies : 3


Replacement

Recently bought a 2nd hand Skywatcher 90 1250 Cassegrain (IIRC!). I knew the red dot finder didn't work - the former keeper tried changing batteries to no avail. Should I try a direct replacement (if yes any recommendations?) or should I consider something like a Seben 5x24 FS1?
Read more : Replacement | Views : 2395 | Replies : 6


Photographing the Sun Using DSLR Photographing the Sun Using DSLR

Hello All,

I'm new here and new to photographty. Eventually I'd like to do some astro photography but for now I'm sticking to DSLRs.

I'd like to know where I can buy a screw-in filter for taking images of the Sun. Is there anything available in the market.

I've searched the internet and found Thousand Oaks but I think they only do filters for telescopes.

If anyone has suggestions kindly let me know.

Thanks.
Read more : Photographing the Sun Using DSLR | Views : 2225 | Replies : 3


Newbie at 70yo!

Due to increasing infirmity I can no longer go fishing and photographing wildlife like a 40yo. I'm seriously looking to make astronomy, a lifelong interest, my new hobby. Advice seems to be towards buying a reflector scope, but what size of scope should I buy to observe the planets and close nebula? :?:
Read more : Newbie at 70yo! | Views : 2895 | Replies : 8


Light pollution in the Warrington Area

Hi,
I was wondering whether any one else in this area of Cheshire has this problem. I can see the centres of galaxies like m81 but cant see the spiral arms. I can see 82 clearly and the divisions in galaxy's disrupted centre which is supposed to be harder to see. I have a feeling its to do with the surface brightness of arms being lower than the surface brightness of the sky. Is there ...
Read more : Light pollution in the Warrington Area | Views : 2035 | Replies : 2


 

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