Search found 59 matches

by geoffrey.landis
Mon Oct 16, 2017 1:50 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: On the Origin of Gold (2017 Oct 15)
Replies: 12
Views: 5359

Neutron stars are hot

I'm quite puzzled by this picture; I'm not sure what it's illustrating.
Certainly not neutron stars, which have surface temperatures considerably higher than the surface of the sun, and thus would be glowing white, not reddish or brick colored or pink with blue splotches.
by geoffrey.landis
Mon Sep 18, 2017 1:35 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Bright Spiral Galaxy M81 (2017 Sep 17)
Replies: 20
Views: 6921

Re: Needs color information

Using the word "V band" to mean "visible light filter" is going to be confusing, and I suggest not doing it.

Probably somebody should have told the IEEE not to use the letter V as a radio band designator.
by geoffrey.landis
Sun Sep 17, 2017 2:52 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Bright Spiral Galaxy M81 (2017 Sep 17)
Replies: 20
Views: 6921

Needs color information

Another image that really really needs color information. Clicking the link in the caption I get this: "This galaxy has been assembled using observations in the V band done by the Subaru Telescope (@ Hawaii) and frames from the Hubble Space Telescope both in 435nm and 814nm wide. RGB data from ...
by geoffrey.landis
Mon Jul 24, 2017 1:52 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Hybrid Solar Eclipse over Kenya (2017 Jul 24)
Replies: 11
Views: 6276

But who is in the photo?

A great image, but I don't understand the caption. The caption states that the person being photographed in front of the eclipsed sun died a week before the eclipse he was photographed in front of. What am I missing here?
by geoffrey.landis
Thu Jul 20, 2017 3:40 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Ireson Hill on Mars (2017 Jul 19)
Replies: 29
Views: 7783

Re: I hate vertically stretched images.

bystander wrote:It's not vertically stretched, it's horizontally compressed.
ROFL.
by geoffrey.landis
Wed Jul 19, 2017 9:12 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Ireson Hill on Mars (2017 Jul 19)
Replies: 29
Views: 7783

I hate vertically stretched images.

Really. This is not a feature on Mars.
by geoffrey.landis
Mon Jul 10, 2017 3:11 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Spiral Galaxy NGC 1512: The Nuclear Ring (2017 Jul 10)
Replies: 43
Views: 29939

Spiral Galaxy NGC 1512: needs context

The explanation didn't make sense until I found the picture of the entire galaxy which this is part of. They should have posted that picture instead or posted a split screen with both. Absolutely agree-- without the context ( https://www.flickr.com/photos/geckzilla/30969093023/in/photostream/ ), th...
by geoffrey.landis
Wed Jun 21, 2017 7:01 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Sundial that Shows Solstice (2017 Jun 21)
Replies: 7
Views: 2541

Re: APOD: A Sundial that Shows Solstice (2017 Jun 21)

Charming. The signature of the solstice, however, is that the sun has (temporarily) stopped changing position from day to day. So the sun is in pretty much the same position the few days before and the few days after. So it's hard to see that a sundial that reads "solstice" on the solstice...
by geoffrey.landis
Thu Jun 08, 2017 6:02 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Firefall by Moonlight (2017 Jun 08)
Replies: 18
Views: 3073

Re: APOD: Firefall by Moonlight (2017 Jun 08)

I'm somewhat puzzled about this image. The sky reflected in the river (bottom left) is brighter than the unreflected sky. I can't quite figure that out.
by geoffrey.landis
Mon May 22, 2017 2:53 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Zodiacal Sky over Horseshoe Bend (2017 May 22)
Replies: 20
Views: 5096

Low tolerance for photocomposite

It's a pretty one, but it has moved beyond my tolerance for photocomposites. The zodiacal light is so extraordinarily faint, there is just no possible way you could see that well-lit view of the lake and cliffs and still see the zodiacal light. This is no longer a case of contrast enhancing; it's re...
by geoffrey.landis
Sun Dec 04, 2016 2:03 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Orion and Official Star Names (2016 Dec 04)
Replies: 62
Views: 11645

What color?

Come on, really. Orion DOES NOT LOOK LIKE THAT.

Please put in the captions SOMEWHERE what the colors mean.
by geoffrey.landis
Fri Nov 25, 2016 7:10 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Apollo 17 VIP Site Anaglyph (2016 Nov 25)
Replies: 19
Views: 3932

Tracks

I look at both sets of photos, but I don't see any tire tracks. The Mars rovers leave tracks easily discernible, so why none visible on the moon? Is the structure of the surface different in some way? I assume there is enough gravity to provide sufficient weight to leave impressions in the 'moon du...
by geoffrey.landis
Fri Nov 25, 2016 7:05 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Apollo 17 VIP Site Anaglyph (2016 Nov 25)
Replies: 19
Views: 3932

Peculiar Anaglyph

That's a peculiar anaglyph. Usually the red and green images are left and right of each other.
by geoffrey.landis
Mon Nov 07, 2016 7:20 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Inverted City Beneath Clouds (2016 Nov 07)
Replies: 12
Views: 2812

Re: APOD: Inverted City Beneath Clouds (2016 Nov 07)

I don't quite understand. "The long shadows it projected onto nearby Lake Michigan near sunset, however, when seen in reflection..." It doesn't seem to make sense to say we're looking at the reflection of the shadows (if these are shadows projected on the late, what is reflecting them?) Ar...
by geoffrey.landis
Sun Oct 16, 2016 3:41 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Cylindrical Mountains on Venus (2016 Oct 16)
Replies: 33
Views: 5012

Re: APOD: Cylindrical Mountains on Venus (2016 Oct 16)

There are, I'm told, good reasons for vertical exaggeration, but I really wish that this would be explicitly called out when it is done.
by geoffrey.landis
Tue Sep 06, 2016 11:05 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Whirlpool Galaxy and Beyond (2016 Sep 06)
Replies: 24
Views: 11984

Colors

It would be nice if APOD images had at least a little discussion of what the colors mean.
by geoffrey.landis
Thu Feb 25, 2016 4:40 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Highest, Tallest, and Closest to the... (2016 Feb 25)
Replies: 26
Views: 15477

Closer to some...further from others (2016 Feb 25)

"That makes Chimborazo's summit the place on Earth's surface closest to the stars."

Indeed. Closer to some of the stars... further from others.
by geoffrey.landis
Wed Jun 10, 2015 1:45 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Fly Over Dwarf Planet Ceres (2015 Jun 10)
Replies: 43
Views: 5934

Flyover of a Cartoon Ceres

I'll agree with the posters complaining about the vertical exaggeration. It makes it more dramatic... but this is not a "fly over of the Dwarf Planet Ceres". It's a fly over of a imaginary dwarf planet that's a caricature based on Ceres. --for years there used to be a parody organization c...
by geoffrey.landis
Fri May 16, 2014 9:21 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Opportunity's Mars Analemma (2014 May 16)
Replies: 36
Views: 9120

Black sky

The caption is a little misleading. It's not that the martian sky is "blacked out" around the solar images; what you're seeing is that when we're pointing the camera directly at the sun, we use a neutral density solar filter, which is so dark that the sky comes out black.
by geoffrey.landis
Thu Aug 15, 2013 1:23 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Moonset from Taiwan (2013 Aug 14)
Replies: 21
Views: 4162

Science and poetry [Re: APOD: Moonset from Taiwan]

FloridaMike wrote: Gee whiz, science and poetry CAN coexist.
can and do coexist-- http://www.astropoetica.com/-- but the signature aspect of poetry is to use language with precision.
by geoffrey.landis
Wed Aug 14, 2013 1:33 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Moonset from Taiwan (2013 Aug 14)
Replies: 21
Views: 4162

Re: APOD Moonset: A Tale of Three Worlds?

Beautiful image, but I don't think I'd describe the sun as a "world".

"Orb," perhaps.
by geoffrey.landis
Mon Jun 24, 2013 3:23 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Venus' Once Molten Surface (2013 Jun 23)
Replies: 32
Views: 4526

Again: VERY misleading image and caption

A very misleading image and caption, I'm afraid. I disagree. That it is a reconstructed radar image is clearly stated. It shouldn't need to say that reflected radio signals were arbitrarily mapped to an orange intensity map. If they had chosen greens instead of reds for APOD, as shown in the recolo...
by geoffrey.landis
Sun Jun 23, 2013 5:28 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Venus' Once Molten Surface (2013 Jun 23)
Replies: 32
Views: 4526

Very misleading image and caption

A very misleading image and caption, I'm afraid. This is a radar image. The dramatic reds and yelows color it have nothing to do with the temperature, or that it is a "once molten" surface. (In fact, all of the rocky planets have a "once molten" surface.) The color in the image i...
by geoffrey.landis
Mon Dec 03, 2012 3:00 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Quadruple Lunar Halo Over Spain (2012 Dec 03)
Replies: 43
Views: 19295

A Double Lunar Halo Over Spain

JohnD wrote:
Where are the other two?
I'll have to agree here-- I see a double halo, but if there are four halos in the image, I sure can't see them.
by geoffrey.landis
Mon May 14, 2012 8:41 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Virtual Flight Over Asteroid Vesta (2012 May 14)
Replies: 24
Views: 7979

Join the Flat Vesta Society!

Last, Dawn images were digitally recast with exaggerated height to better reveal Vesta's 5-km high mountain Aricia Tholus.
Anybody else want to join the Flat Vesta Society?

Vertical exaggeration is cool... but if you want to know what Vesta looks like, that isn't it.