Search found 10 matches
- Sat Feb 19, 2011 1:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Spiral Galaxy NGC 2841 Close Up (2011 Feb 19)
- Replies: 13
- Views: 3520
Re: APOD: Spiral Galaxy NGC 2841 Close Up (2011 Feb 19)
I am strictly an amateur, so forgive me if I am wrong about this: In photos like this of distant galaxies, people talk about "dust." I am aware that there is certainly interstellar dust that is probably as fine as. . .well, as fine as dust. But is not the "dust" in these photos a...
- Sun Feb 06, 2011 11:53 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: An Anomalous SETI Signal (2011 Feb 06)
- Replies: 44
- Views: 5524
Re: APOD: An Anomalous SETI Signal (2011 Feb 06)
This signal is described as "an unusual modulation between a GPS satellite and an unidentified Earth-based source." I believe the appropriate phrase is "beat frequency," not "modulation." A beat frequency is the mixing of two signals to produce the sum and the differenc...
- Fri Feb 04, 2011 11:36 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Zeta Oph: Runaway Star (2011 Feb 04)
- Replies: 52
- Views: 7060
Re: APOD: Zeta Oph: Runaway Star (2011 Feb 04)
It's too bad we use the phrase "false color" for images like this. The colors aren't really false, but shifted so we can see wavelengths we can't naturally see. I know that for most of us this will sem a trivial distinction, but I recently attended a focus group on astrophotography and one...
- Thu Feb 03, 2011 12:09 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Powers of Ten (2011 Feb 01)
- Replies: 31
- Views: 6367
Re: APOD: Powers of Ten (2011 Feb 01)
I have a used set of gravitational tenterhooks for sale on eBay if anyone is interested. :wink: How many hours are on them? Is a warranty still available? Does the Buy Now price include free shipping? "How many hours are on them?" you ask. How in the heck could I know that? Gravitational ...
- Wed Feb 02, 2011 2:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Powers of Ten (2011 Feb 01)
- Replies: 31
- Views: 6367
Re: APOD: Powers of Ten (2011 Feb 01)
Nah... Artificial gravity is a well known by-product of any technology which allows us to accelerate past the speed of light. Not to worry. Actually, in order to produce artificial gravity you need a set of gravitational tenterhooks. As everyone knows, tenterhooks (from the familiar idiom "on ...
- Wed Feb 02, 2011 1:43 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Powers of Ten (2011 Feb 01)
- Replies: 31
- Views: 6367
Re: APOD: Powers of Ten (2011 Feb 01)
1.-I agree with Protagoras that man is the measure of all things, and the construction of the video was made on the basis of man to the maximum, and in man to a minimum.. No, we are not the measure of all things, and this video is not based on that notion. Instead, it is one of the wonders of the c...
- Tue Feb 01, 2011 11:32 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Powers of Ten (2011 Feb 01)
- Replies: 31
- Views: 6367
Re: APOD: Powers of Ten (2011 Feb 01)
Here is another version of the Powers of Ten sequence, this one written in Java at Florida State University.
http://micro.magnet.fsu.edu/primer/java ... index.html
http://micro.magnet.fsu.edu/primer/java ... index.html
- Mon Jan 31, 2011 7:38 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Japans Kounotori2 Supply Ship the... (2011 Jan 31)
- Replies: 37
- Views: 14491
Re: APOD: Japans Kounotori2 Supply Ship the... (2011 Jan 31)
I say it is Tibet, looking south toward the Himalayan foothills at the edge of the globe. I just don't believe there are that many places on Earth that are so arid over the 30 or so degrees of arc in the photograph. By the way, didn't they used to call them "unmanned missions"? Now we have...
- Thu Jan 06, 2011 2:20 pm
- Forum: The Library: Information Desk and Educational Resources
- Topic: Size and Age of the Universe
- Replies: 62
- Views: 6138
Re: Size and Age of the Universe
I think many people assume that the BB took place in an infinite space, and that matter and energy expanded from a tiny point--a singularity--into an existing matrix of empty space, and continues to fill that space as it expands into infinity. I have always thought of the BB as an actual expansion o...
- Thu Jan 06, 2011 1:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Eclipsing the Sun (2011 Jan 05)
- Replies: 40
- Views: 3896
Re: APOD: Eclipsing the Sun (2011 Jan 05)
A corrolary to this photograph is that occupants of the ISS must have observed the eclipse. What a sight that must be from space! I wonder if the ISS (or any other orbiting humans) have ever witnessed a total eclipse of the sun? ![Question :?:](./images/smilies/icon_question.gif)
![Question :?:](./images/smilies/icon_question.gif)