Search found 10 matches

by Oldfart
Mon Feb 06, 2012 6:49 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Dust of the Orion Nebula (2012 Feb 06)
Replies: 49
Views: 6355

Re: APOD: Dust of the Orion Nebula (2012 Feb 06)

Where is the Horsehead Nebula in this picture?
by Oldfart
Wed Dec 21, 2011 10:12 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Horseshoe Einstein Ring from Hubble (2011 Dec 21)
Replies: 50
Views: 7286

Re: APOD: A Horseshoe Einstein Ring from Hubble (2011 Dec 21

Two questions: (1) Do we, or do our computers, have the capability to produce an accurate image of the galaxy that was lensed? And (2) Does this sort of lensing let us look further away with our telescopes than would otherwise be the case with no lensing?
by Oldfart
Tue Mar 30, 2010 4:44 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Unusual Starburst Galaxy NGC 1313 (2010 Mar 30)
Replies: 28
Views: 2646

Re: APOD: Unusual Starburst Galaxy NGC 1313 (2010 Mar 30)

Maybe this represents a collision between two (or maybe three?) galaxies that is going on right now --?

OF
by Oldfart
Mon Mar 01, 2010 7:37 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Slope Streaks in Acheron Fossae on Mars (2010 Mar 01)
Replies: 24
Views: 7562

Re: APOD: Slope Streaks in Acheron Fossae on Mars (2010 Mar

It seems improbable that dark sand could somehow spread out from point sources in the way shown. This stuff looks exactly like crude oil, emerging from little springs. Wow!

OF
by Oldfart
Sun Feb 21, 2010 6:17 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Geostationary Highway (2010 Feb 20)
Replies: 24
Views: 3504

Re: APOD: Geostationary Highway (2010 Feb 20)

Chris, perhaps we'll need to send a "janitor" satellite up there someday to sweep up the dead stuff. Or will the dead ones drift away within a reasonable time due to being perturbed by the moon and sun's gravity?

OF
by Oldfart
Fri Feb 05, 2010 4:48 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: P2010 A2: Unusual Asteroid Tail ... (2010 Feb 03)
Replies: 35
Views: 5091

Re: P2010 A2: Unusual Asteroid Tail Implies... (2010 Feb 03)

Chris, yes, that makes sense. I was interpreting the pixtelization (is that a word?) plus maybe some high-contrast processing of the image as showing a bunch of big rocks hurtling through space. I feel better now...

Thanks for being so patient!

Don
by Oldfart
Fri Feb 05, 2010 3:20 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: P2010 A2: Unusual Asteroid Tail ... (2010 Feb 03)
Replies: 35
Views: 5091

Re: P2010 A2: Unusual Asteroid Tail Implies... (2010 Feb 03)

Chris, thanks for trying to help me figure out what's going on here. I say "trying", because I'm still a bit fuzzy about this. As in: It was my notion that the Hubble photo resolved the tail, showing that it was comprised of thousands of individual points of light, and I assumed that each ...
by Oldfart
Thu Feb 04, 2010 5:25 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: P2010 A2: Unusual Asteroid Tail ... (2010 Feb 03)
Replies: 35
Views: 5091

Re: P2010 A2: Unusual Asteroid Tail Implies... (2010 Feb 03)

The tail of this object is evidently comprised of many chunks of stuff large enough to be individually detected by Hubble. I don't know what size rocks can be resolved by Hubble at this distance, but it's pretty evident that these are big rocks. If so, how could the whimpy light pressure from the su...
by Oldfart
Sun Nov 09, 2008 6:44 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Visibility of APOD objects in amateur telescopes?
Replies: 6
Views: 1460

Re: Visibility of APOD objects in amateur telescopes?

I'd love to see a tidbit about the visual observability of objects that are posted. Good! Looks like we have a popular landslide vote on its way for this, it's picking up steam! (Anyone else?) And I appreciate the thoughtful comments from you folks concerning this subject. I realize that the APOD t...
by Oldfart
Fri Nov 07, 2008 6:45 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Visibility of APOD objects in amateur telescopes?
Replies: 6
Views: 1460

Visibility of APOD objects in amateur telescopes?

It's pretty obvious to amateur astronomers that your APOD's of the moon, planets, and other familiar objects are or are not visible to some extent in amateur-size telescopes. But I've often wondered if I'd have a chance of glimpsing some of the finer deep sky objects that Hubble or observatories cap...