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| 1 | 2 |  » Stats |
Members: 50,124
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Top Poster: glsammy (15,069)
| | Welcome to our newest member, Woodsie71 | |  | 
09-09-2009, 08:50 PM
|  | Commander of the Wild Empire | | Join Date: Jun 2009 Location: SW London
Posts: 2,099
| | | Hubbles latest photos
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Listen out for meaning, listen out for truth, listen out for life. Listen out for the birds. |
09-09-2009, 11:53 PM
| | Member of the Wild Empire | | Join Date: Aug 2009
Posts: 249
| | | Re: Hubbles latest photos
Wow, stunning pics!  |
13-09-2009, 06:32 PM
|  | Active Member | | Join Date: Jul 2009 Location: Peterborough
Posts: 29
| | | Re: Hubbles latest photos
Superb!!! |
13-09-2009, 06:50 PM
|  | Commander of the Wild Empire | | Join Date: Jul 2008 Location: west midlands
Posts: 1,821
| | | Re: Hubbles latest photos
Puts everything into perspective eh! Brilliant images.
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'one life'... respect it, enjoy it! |
17-09-2009, 06:19 PM
|  | Active Member | | Join Date: Sep 2009 Location: Chepstow
Posts: 56
| | | Re: Hubbles latest photos
Quote:
Originally Posted by loripo  | Thank you Lori for posting this. Astronomy is another of my great interests, and I have a Newtonian 7inch reflector, which we built back in 1996 which gives great pleasure.
Those Hubble pics are beautiful. Its good to be around at this time |
17-09-2009, 06:33 PM
| | Commander of the Wild Empire | | Join Date: Jun 2009 Location: SW London
Posts: 2,099
| | | Re: Hubbles latest photos
Do have a look at Nytecam's thread on DIY star spectra, one of his Youtube videos shows his home setup, - you might be interested in that. I remember seeing a photo on a calendar not long ago that showed one of the nebula (nebuli!) and described it as being trillions of light years across. Awesome.
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Listen out for meaning, listen out for truth, listen out for life. Listen out for the birds. |
15-10-2009, 08:22 AM
| | Active Member | | Join Date: May 2009 Location: Leeds
Posts: 25
| | | Re: Hubbles latest photos
Can somebody tell me as a complete novice. Are the colours in those photos as you would actually see the nebula if it were possible to see it with the naked eye or is it just one part of the light spectrum. |
15-10-2009, 12:21 PM
| | Commander of the Wild Empire | | Join Date: Jun 2009 Location: SW London
Posts: 2,099
| | | Re: Hubbles latest photos
Interesting question - I had no idea either But I had a google and found the hubblesite dot org site which explains how they take b/w and extrapolate the colours. 
Hope you can read what it says or can find the site
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Listen out for meaning, listen out for truth, listen out for life. Listen out for the birds.
Last edited by loripo; 15-10-2009 at 12:22 PM.
Reason: incorrect site name
|
15-10-2009, 10:17 PM
|  | Commander of the Wild Empire | | Join Date: Oct 2008 Location: north Surrey/SW London
Posts: 1,145
| | | Re: Hubbles latest photos
Quote:
Originally Posted by Mossie Can somebody tell me as a complete novice. Are the colours in those photos as you would actually see the nebula if it were possible to see it with the naked eye or is it just one part of the light spectrum. | In a word NO  Even if these nebulae where on your doorstep, so to speak, and filled half the sky they would possess little or no colour at all because they are inordinately faint and our eyes are designed to register colour in bright conditions eg daylight. 
Proof of this is our own Milky Way galaxy in which we reside - it appears as a faint irregular colourless band of light arching overhead from horizon to horizon in summer and autumn under dark moon-free skies remote from artifical light in areas of low human population. And the Milky Way is typically brighter than many of the nebulae recorded by Hubble ST.
To record nebulae the camera exposures may run to an hour which is ~ x18000 longer than the integration 'exposure' of the eye. Also to highlight various 'glowing' elements in the nebula special filters are used to record in sequence hydrogen [H-alpha], oxygen [OIII] and sulphur [S] and allocate red, green and blue colour to each element. This wouldn't resemble what the eye could see if it were sensitive enough to view colour this faint. There are various artificial 'palettes' - the Hubble 'palette' is used on reconstructed colour images from the Hubble ST - where the results, as mentioned, are fantastic if unreal 
Last edited by nytecam; 15-10-2009 at 10:27 PM.
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16-10-2009, 09:14 AM
| | Active Member | | Join Date: May 2009 Location: Leeds
Posts: 25
| | | Re: Hubbles latest photos
Ok thanks very much for your detailed and interesting replies | | |
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