Talk:Hubble Ultra-Deep Field

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This is an old revision of this page, as edited by ClairSamoht (talk | contribs) at 21:30, 28 September 2006 (→‎Slight confusion?: It's a meter to an adult's outstretched arm, not 70 cm). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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The patch of sky in which the galaxies reside (just one-tenth the diameter of the full moon) [...]. The "diameter" depends on how far away you are from the object observed. Giving a arcsecond number as the Hubble Deep Field article does ([The Hubble Deep Field photo] covers an area 144 arcseconds across, equivalent in angular size to a tennis ball at a distance of 100 metres.) is more precise. --Abdull 08:59, 25 April 2006 (UTC)[reply]

Sounds good to me. Most people are on the earth when they look at the moon, giving a distance of about 400,000km. I think the moon measurement is worth keeping in too as most people don't know what an arcsecond is, though the tennis ball analogy is also good. Stephen B Streater 16:39, 25 April 2006 (UTC)[reply]
I just added the phrase "as viewed from Earth" after "diameter of the full moon", which I think keeps it tied to a common reference (á la Stephen B Streater's point) but also making it technically accurate. Ryan McDaniel 20:02, 25 April 2006 (UTC)[reply]

...looking back in time more than 13 billion light years. This doesn't seem correct. A light year is a measure of distance, not time. Does the author actually mean "13 billion years"?Frankwomble 18:35, 25 April 2006 (UTC)[reply]

Yes - but then isn't the Universe around 13 billion years old? Perhaps it's nearer to 14 Bn. Stephen B Streater 19:57, 25 April 2006 (UTC)[reply]
Technically, one could make the nitpicking argument that they're equivalent, since the Hubble is looking at light, which does, after all, travel one light-year in a year. However, it is confusing; I've changed it to "years". Ryan McDaniel 20:02, 25 April 2006 (UTC)[reply]
The latest official age of the universe is around 13.7 billion years old. This information is in the latest edition of the Astronomy for Dummies. --Siva1979Talk to me 20:24, 25 April 2006 (UTC)[reply]

Category: Aminov Images

I capitalized this category listing (was "aminov images"), but neither category exists. What are "aminov images", and what's the reason for putting the HUDF in this category? Ryan McDaniel 20:02, 25 April 2006 (UTC)[reply]

Slight confusion?

Okay so I'm a little confused, is the image of an area of sky the size of 1/10th of the moon... or is it an image of the sky less than a spec of sand held at arms length?

Everytime i re-read the article my conclusion differs from the last, can someone clear this up please? Thanks Stevey^ 16:11, 8 June 2006 (UTC)[reply]

Remember it is a tenth of the diameter of the full moon - that's a hundredth of the area of the full moon. Also because of optical illusion, the full moon appears larger than it actually is (half a degree diameter) - at arm's length (about 70 cm), an object 6 mm diameter (about the size of a small pea) would cover the moon. An object 0.6 mm diameter would cover the HUDF pic, and yes, that's about the size of a grain of sand. - MPF 21:22, 8 June 2006 (UTC)[reply]
Are you eight years old, MPF? It's considerably more than 70 cm for an adult. For generations, drygoods merchants have been measuring yard goods by the distance from their nose to their thumb and forefinger clenched together. The moon (or the sun - they are almost the same size - is the size of a dime held at arm's length - and that's 17.91 mm. A diameter of 1.79 mm is considerably bigger than a grain of sand; it's almost as big as a small peppercorn. ClairSamoht - Help make Wikipedia the most authoritative source of information in the world 21:30, 28 September 2006 (UTC)[reply]
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