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gippgig

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Jun 1, 2015, 2:34:50 AM6/1/15
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Bobby Baum

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Jun 29, 2015, 4:48:11 AM6/29/15
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www.spacedaily.com/reports/Roadmap_to_the_Stars_999.html

gippgig

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Aug 5, 2015, 2:47:59 AM8/5/15
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gippgig

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Oct 9, 2015, 1:14:40 AM10/9/15
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A private lunar lander now has a launch reservation:
www.washingtonpost.com/news/the-switch/wp/2015/10/07/the-first-ever-private-mission-to-the-moon-just-got-a-lot-closer-to-reality/
However, there has already been a private mission to the moon (not a lander) - when a launch failure in the 1990s left the AsiaSat 3 comsat in the wrong orbit engineers were able to get it into a usable orbit by sending it to the moon for a gravity assist.

gippgig

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Apr 21, 2016, 4:59:42 PM4/21/16
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gippgig

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May 5, 2016, 4:10:07 AM5/5/16
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gippgig

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May 10, 2016, 4:55:19 PM5/10/16
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Bobby Baum

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Aug 1, 2016, 9:22:46 PM8/1/16
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Achieving Science with CubeSats: Thinking Inside the Box
www.nap.edu/download/23503

gippgig

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Feb 4, 2017, 8:29:51 PM2/4/17
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Serious planning for an interstellar mission:
First trip to the stars
Nature Vol. 542 issue 7639 p. 20 (Feb. 2)
Also see www.spacedaily.com/reports/Full_Braking_at_Alpha_Centauri_999.html

gippgig

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Jul 13, 2017, 10:14:01 PM7/13/17
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...and how to use solar gravitational lensing for interstellar communication:
arxiv.org/pdf/1706.05570.pdf

gippgig

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Aug 26, 2017, 10:25:49 PM8/26/17
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gippgig

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Dec 30, 2017, 5:31:02 PM12/30/17
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nancy lessons

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Dec 31, 2017, 3:38:48 AM12/31/17
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This is awesome, thanks for sharing this info!
Nancy

On Sat, Dec 30, 2017 at 5:31 PM, gippgig <gip...@gmail.com> wrote:

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gippgig

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Feb 2, 2018, 5:09:48 PM2/2/18
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www.sciencemag.org/news/2018/01/amateur-astronomer-dicovers-revived-nasa-satellite
Receiving satellite telemetry would be an interesting and potentially useful project - still-functioning satellites are often abandoned because the pros don't have time to listen to them. This would also be a good way to get HARC and the rest of HacDC to work together.

Bobby Baum

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Feb 3, 2018, 4:59:12 PM2/3/18
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Oops, that should be
www.sciencemag.org/news/2018/01/amateur-astronomer-discovers-revived-nasa-satellite

gippgig

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Mar 6, 2018, 3:53:44 PM3/6/18
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gippgig

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Mar 12, 2018, 6:16:39 PM3/12/18
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gippgig

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May 21, 2018, 9:59:25 PM5/21/18
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gippgig

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Oct 11, 2018, 4:47:37 PM10/11/18
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Moons could have moons: arxiv.org/abs/1810.03304

gippgig

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Oct 20, 2018, 1:00:02 AM10/20/18
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NASA Image and Video Library: images.nasa.gov

gippgig

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Nov 7, 2018, 9:28:45 PM11/7/18
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Was the interstellar object Oumuamua a solar sail?
arxiv.org/pdf/1810.11490.pdf

Julia Longtin

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Nov 7, 2018, 9:58:16 PM11/7/18
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i hope so! :)

On Thu, Nov 8, 2018 at 2:28 AM gippgig <gip...@gmail.com> wrote:
Was the interstellar object Oumuamua a solar sail?
arxiv.org/pdf/1810.11490.pdf

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Bobby Baum

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Nov 7, 2018, 10:06:59 PM11/7/18
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Idle speculation - if it was a starship maybe it ignored us because we
failed its intelligence test; perhaps hitting it with a pulsed
neutrino beam would have caused a response.

Tom Iddings

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Nov 7, 2018, 10:45:36 PM11/7/18
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Oh yeah. Tangentially this made me start thinking about what levels of signal collection sensitivity vs. signals broadcasting power two species need to develop to reliably be able say hello and expect a response. Like a modified drake equation whose product is the probability of making radio contact with an intelligent species. What sort of systems would SETI need to build that would push the probability of contact with a suitably advanced species towards 1, if the other variables are supportive?
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Bobby Baum

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Nov 7, 2018, 10:55:36 PM11/7/18
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Expecting aliens to try to make contact using radio is an example of
what I call Earthism - assuming that everything else is like us. (Note
that in the case where it has been tested, Earthism is totally wrong -
contrary to previous belief, extrasolar planetary systems are often
totally unlike our own.) I think aliens would most likely use visible
light - it's the frequency range at which stars radiate most strongly
so creatures' eyes are most likely to detect visible light, it can
propagate long distances, and there is no need to build a transmitter
- just modulate the light from your star (i.e., with something like
giant Venetian blinds). I wonder if we've already detected an
extraterrestrial signal and written it off as an irregular variable
star.

Tom Iddings

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Nov 7, 2018, 11:21:58 PM11/7/18
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I agree that the problem is what sort of signals to look for. Maybe
interstellar civilizations like to communicate by modulating the
brightness of stars at high frequency.
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Nicolas Sabharwal

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Nov 8, 2018, 10:02:54 AM11/8/18
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It looked like a rock.

Zachary Huberty

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Nov 8, 2018, 10:16:39 AM11/8/18
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What a troll
ZACHARY J. HUBERTY
202-590-0915
 
 

James Sullivan

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Nov 8, 2018, 11:01:15 AM11/8/18
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Radiation strength versus frequency depends on what type of star it is.  Even our own sun with significant human-visible light spectrum emissions puts out plenty of radiation at the H-alpha frequency in the IR band.  The below image shows solar spectral distribution at the lower atmosphere.  Significant amounts of IR get sucked up by the air, while the visible light passes through.  Stars of different composition and temperature (and age, size, mass, etc.) radiate differently.  (Not sure if image will survive email.  Figure 4 here: http://environ.andrew.cmu.edu/m3/s2/02sun.shtml )

http://environ.andrew.cmu.edu/m3/s2/graphics/embedded/fig4.gif

See y’all next month!

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Kevin Cole

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Nov 8, 2018, 11:32:11 AM11/8/18
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On Wed, Nov 7, 2018 at 10:55 PM Bobby Baum <gip...@gmail.com> wrote:

I think aliens would most likely use visible
light - it's the frequency range at which stars radiate most strongly
so creatures' eyes are most likely to detect visible light, it can
propagate long distances, and there is no need to build a transmitter
- just modulate the light from your star (i.e., with something like
giant Venetian blinds). I wonder if we've already detected an
extraterrestrial signal and written it off as an irregular variable
star.

This is yet another case of "Earthism": It presumes that life capable of (and interested in) searching for other life that is equally capable of (and interested in) the same, becomes aware of their environment using the same sorts of sensors we're used to on this planet, and that they would reach for the same set of tools...

It might be fair to say -- with the caveat "as 'far' (pun intended) as we KNOW" -- radiation is the best long-distance carrier of information. But who's to say that these extraterrestrials are "wired" to perceive, and classify / separate the same frequencies of it that terrestrial life forms do?


Enrique Cobas

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Nov 8, 2018, 8:49:29 PM11/8/18
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Modulated gravity waves or neutrino beams might penetrate through dust clouds and other obstacles better than light. Maybe something we aren't aware of yet. Or my default hypothesis which is that since the speed of light is pretty slow and distances so large they just don't see the point in reaching out.

Tom Iddings

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Nov 8, 2018, 10:45:22 PM11/8/18
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I guess my original point was just that a civilization might become technologically advanced enough to sense and analyze the entire bandwidth in every direction of all available signals travelling at /c/, such that they'd be almost guaranteed to hear any sort of deliberate and sustained ping out to a certain distance and amplitude. There isn't much point to talking to aliens but there isn't much risk either, and it's not too unlikely that any real interplanetary extrasolar aliens are possessed of the same curiosity that drives SETI.

David Prentiss

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Nov 9, 2018, 10:37:25 AM11/9/18
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heavensgate.jpeg

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gippgig

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Jan 18, 2019, 11:54:07 PM1/18/19
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Kevin Cole

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Jan 19, 2019, 10:20:00 AM1/19/19
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On Fri, Jan 18, 2019 at 11:54 PM gippgig <gip...@gmail.com> wrote:


The article appears to have missed the obvious (or maybe I did) -- the URL https://technosearch.seti.org/

And, bragging rights / street cred: I *was* user #45 of SETI@Home before they screwed up their database and bumped me to user #27114. (I attended a conference where Jill Tarter announced the beta version would launch shortly after the conference.) I've been running SETI@Home somewhere(s) for a very long time.


C'est moi:

http://setiathome.berkeley.edu/show_user.php?userid=27114



gippgig

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Jan 24, 2019, 10:13:09 PM1/24/19
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gippgig

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Jan 28, 2019, 9:30:45 PM1/28/19
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gippgig

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Feb 2, 2019, 3:29:04 PM2/2/19
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gippgig

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gippgig

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Feb 11, 2019, 6:11:00 PM2/11/19
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gippgig

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Feb 22, 2019, 1:46:52 AM2/22/19
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gippgig

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Mar 18, 2019, 6:51:43 PM3/18/19