Search found 324 matches
- Thu Jun 26, 2014 3:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Conjunction by the Sea (2014 Jun 26)
- Replies: 19
- Views: 7910
Re: APOD: Conjunction by the Sea (2014 Jun 26)
It is so difficult to find good timber any more. The newer piles are a lot thinner than the original ones. The only second-growth forests I know of are in protected parks, towering over a hundred feet overhead with trunks you can't put your arms around. Perhaps if that kind of lumber were used at th...
- Sun Jun 15, 2014 2:22 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: CMB Dipole: Speeding Through the... (2014 Jun 15)
- Replies: 32
- Views: 8964
Re: APOD: CMB Dipole: Speeding Through the... (2014 Jun 15)
Was the 600km/s speed adjusted to account for space-time expansion? My guess is that since space-time expansion is constant in all directions, it would not affect the speed relative to the CMB. quo vadis - where are you going (present indicative singular) quo vadimus - where are we going (present in...
- Wed Jun 11, 2014 2:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Three Galaxies over New Zealand (2014 Jun 11)
- Replies: 21
- Views: 10618
Re: APOD: Three Galaxies over New Zealand (2014 Jun 11)
I really need to get someplace dark enough to see that again. In my yoot it was dark enough in the Adirondacks to see the entire arch, but along came light pollution.
Somebody better get a tech out there, the dish is leaking galaxies.
Somebody better get a tech out there, the dish is leaking galaxies.
Click to play embedded YouTube video.
- Mon Jun 09, 2014 2:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: How to Identify that Light in the Sky (2014 Jun 09)
- Replies: 63
- Views: 32940
Re: APOD: How to Identify that Light in the Sky (2014 Jun 09
Weather balloons sent aloft during twilight will reflect the sun when they get high enough. When such objects are moving directly toward you, they appear stationary. However, rivers of air can criss-cross, causing the balloons to rapidly change direction. Then when they get to a jet stream, off they...
- Tue Jun 03, 2014 4:50 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: WR 104: A Pinwheel Star System (2014 Jun 03)
- Replies: 33
- Views: 12803
Re: APOD: WR 104: A Pinwheel Star System (2014 Jun 03)
Hmm, we're looking at photons that left the theater 8,000 years ago. We'd never know when the doomsday event occurred, so "Don't Worry, Be Happy!"
PS You'll recognize me as the guy in the lead suit.
PS You'll recognize me as the guy in the lead suit.
- Fri May 30, 2014 5:45 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Nix Spitzer?!
- Replies: 0
- Views: 219
Nix Spitzer?!
http://www.nature.com/news/nasa-might-n ... rs-1.15289
Where do I sign up to volunteer for converting that data? I'd set up a Spitzer@Home server for distributed data conversion. Maybe build a supercomputer out of hundreds of Raspberry Pi boards?
Where do I sign up to volunteer for converting that data? I'd set up a Spitzer@Home server for distributed data conversion. Maybe build a supercomputer out of hundreds of Raspberry Pi boards?
- Fri May 30, 2014 4:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Planetary Nebula Abell 36 (2014 May 30)
- Replies: 22
- Views: 10797
Re: APOD: Planetary Nebula Abell 36 (2014 May 30)
Doctor Adam Block created that image with a 32" telescope? LRGB = 7:3:3:3 I don't know what that means. The grayish haze is probably the result of high-altitude dust. Tucson had some rip-snorting wind storms blowing in from Texas last month, 50mph+ gusts and all. Could be high altitude smoke fr...
- Tue May 27, 2014 2:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Star Factory Messier 17 (2014 May 27)
- Replies: 19
- Views: 4072
Re: APOD: Star Factory Messier 17 (2014 May 27)
Approximately how many stars are generating the stellar winds and radiation that energize the visible nebula? 44-Trillion miles is quite a distance for energized particles to travel in order to knock electrons off of some interstellar clouds. (assuming a 7.5 light-year radius)
- Thu May 22, 2014 3:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Halo for NGC 6164 (2014 May 22)
- Replies: 38
- Views: 12437
Re: APOD: A Halo for NGC 6164 (2014 May 22)
What is the radius of the faint halo cloud? More than eight light years? The referenced article in the referenced APOD link, http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985PASP...97..780F&link_type=ARTICLE&db_key=AST&high= describes distances from the star in parsecs. The o...
- Thu May 22, 2014 3:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Meteors, Planes, and a Galaxy over... (2014 May 19)
- Replies: 24
- Views: 8066
Re: APOD: Meteors, Planes, and a Galaxy over... (2014 May 19
Is one who uses the term Oriontated an Oriontater? Can one make fries from an Oriontater, or O'tater salad? Sez here Oriontaters taste best when picked while Orion is directly overhead.
- Mon May 19, 2014 4:43 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Meteors, Planes, and a Galaxy over... (2014 May 19)
- Replies: 24
- Views: 8066
Re: APOD: Meteors, Planes, and a Galaxy over... (2014 May 19
Definitely well worth the wind chill exposure! Trying to get orientated, if orientated is the word for which I'm searching, on the horizon, is that Humphrey's Peak right of center? The glow on either side would be Flagstaff? The faint glow to the left, between the pillar and tree, could that be Phoe...
- Mon May 19, 2014 4:29 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May 18)
- Replies: 13
- Views: 7007
Re: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May
Boy, is my face red. Can't even read my own references. Although the surface pressure is much greater than 1000 bars (A Jovian walks into a thousand bars...forgot how the rest of it goes.), the surface isn't all that dense, contrariwise I. Surface Pressure: >>1000 bars Wind speeds Up to 150 m/s (<30...
- Sun May 18, 2014 6:02 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May 18)
- Replies: 13
- Views: 7007
Re: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May
It is my understanding that Jupiter is composed mostly of hydrogen. Its mass is about 317.8 Earths, or 1.8986×1027 kg. http://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html The heat and pressure down below creates metallic hydrogen, a kind of slippery fluid similar to mercury, which genera...
- Sun May 18, 2014 2:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May 18)
- Replies: 13
- Views: 7007
Re: APOD: Jupiter's Great Red Spot from Voyager 1 (2014 May
Van Gogh "Starry Night"? If you go to the Van Gogh wiki page, there is an image of "Starry Night" 30,000 × 23,756 pixels. https://en.wikipedia.org/wiki/File:Van_Gogh_-_Starry_Night_-_Google_Art_Project.jpg Therein you can zoom into the stars and examine how the paint was applied ...
- Tue May 13, 2014 1:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: CG4: A Ruptured Cometary Globule (2014 May 13)
- Replies: 35
- Views: 13318
Re: APOD: CG4: A Ruptured Cometary Globule (2014 May 13)
Is not that the thing into which Commodore Decker piloted the U.S.S. Constellation?
- Sun May 11, 2014 2:17 pm
- Forum: Open Space: Discuss Anything
- Topic: Two slits walk into a bar
- Replies: 3
- Views: 435
- Sun May 11, 2014 2:14 pm
- Forum: Open Space: Discuss Anything
- Topic: The thousand post club
- Replies: 786
- Views: 434991
Re: The thousand post club
Metric: "a mathematical function that associates a real nonnegative number analogous to distance with each pair of elements in a set such that the number is zero only if the two elements are identical, the number is the same regardless of the order in which the two elements are taken, and the n...
- Sun May 11, 2014 2:03 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Valles Marineris: The Grand Canyon... (2014 May 11)
- Replies: 46
- Views: 15083
Re: APOD: Valles Marineris: The Grand Canyon... (2014 May 11
In the large image, there are two features left of center that appear to be fractals. It looks to me like something started from the left side, washed down left to right, and settled in that playa on the right edge. You won't trick me into commenting on the giant 'H' above the far left side, nope, d...
- Fri May 09, 2014 7:11 pm
- Forum: Open Space: Discuss Anything
- Topic: Two slits walk into a bar
- Replies: 3
- Views: 435
Two slits walk into a bar
Someone put for the proposition that a photon is neither a particle nor a wave, but a cloud of probability amplitudes. The cloud gets as wide as the two slits, then parts of it goes through both slits. The wavelike pattern at the receiver end of the box depends on the time interval to a spot from ea...
- Fri May 09, 2014 6:49 pm
- Forum: Open Space: Discuss Anything
- Topic: ScienceOpen Q and A
- Replies: 10
- Views: 704
Re: ScienceOpen Q and A
I once read a paper in the computer science category that described how some programmers in India wrote a program in BASIC. I don't understand how that paper could have appeared in any peer-reviewed journal. Had that paper crossed my desk, I would have reached for my red WD stamp before finishing th...
- Fri May 09, 2014 6:44 pm
- Forum: Open Space: Discuss Anything
- Topic: The thousand post club
- Replies: 786
- Views: 434991
Re: The thousand post club
Does not quality trump quantity? Suppose you multiply each post by a number between 0-100 suggesting an arbitrary qualitative judgement, then add them up. I imagine Dr. Neufer would remain near the top, what about the rest? [Disclaimer: This post will not be included in any quantitative or qualitati...
- Fri May 09, 2014 6:37 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Halley Dust and Milky Way (2014 May 09)
- Replies: 20
- Views: 12515
Re: APOD: Halley Dust and Milky Way (2014 May 09)
Does the fact that Earth plows through the debris trail Halley left behind suggest the possibility, however remote, that the two could meet? As the Earth moves (wasn't that a soap opera?) through the debris, how does that affect the nearby particles? Is there a small stream of particles now followin...
- Wed May 07, 2014 4:48 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Curiosity Inspects Mt Remarkable on Mars (2014 May 07)
- Replies: 43
- Views: 21083
Re: APOD: Curiosity Inspects Mt Remarkable on Mars (2014 May
Remarkable! Now, where'd I put my copy of Strunk & White? Thesae and peer-reviewed papers conform to the Chicago Manual Of Style, contrawise image blurbs. There be space monkeys inside that mansion! Whatever you do, don't send Rover over (?) to knock on the door. We do not yet understand Martian...
- Wed Apr 23, 2014 3:11 pm
- Forum: Open Space: Discuss Anything
- Topic: Peep-O-Nauts
- Replies: 5
- Views: 566
Re: Peep-O-Nauts
Methinks Dr. Fun started the "Save The Peeps" movement. http://www.ibiblio.org/Dave/Dr-Fun/collections/peeporama/peeporama-2.html http://www.ibiblio.org/Dave/ar00512.htm http://www.ibiblio.org/Dave/Dr-Fun/collections/peeporama2003/peeporama2003-3.html There's a lot more in his archive. One...
- Wed Apr 23, 2014 2:29 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Arp 81: 100 Million Years Later (2014 Apr 23)
- Replies: 29
- Views: 23443
Re: APOD: Arp 81: 100 Million Years Later (2014 Apr 23)
Consider the center of mass of each galaxy connected via a rubber band. If you speed up the clock, you'll see the centers zip past each other until the rubber band is fully stretched, then back again. Off-center, they will not collide during this cosmic dance. Bad analogy, but it's a start. The indi...