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RIP, Stephen Hawking by palsing[_2_]
A brilliant life has finally come to an end at age 76. We are very lucky to have had him for so long. \Paul A
(Multi-page thread 1 2 3)
March 21st 18 12:55 PM
by Chris.B[_3_] Go to last post
25 1,157
A rotating Earth with a proper inclination by Gerald Kelleher
https://en.wikipedia.org/wiki/Deep_Space_Climate_Observatory#/media/File:EpicEarth-Globespin-tilt-23.4.gif By right the rotation relative to the orbital plane...
March 18th 18 07:18 PM
by Gerald Kelleher Go to last post
2 516
The photographic medium Joe Public isn't allowed to buy by RichA[_6_]
Neutron imaging!! https://en.wikipedia.org/wiki/Neutron_imaging However, Muon imagers may at some point be available, they are used now to x-ray vehicles...
March 18th 18 02:13 PM
by Chris L Peterson Go to last post
5 400
Sub-Auroral Ion Drifts discovered to cause unusual purple aurora by Quadibloc
I ran across this news item: https://phys.org/news/2018-03-mystery-purple-sky-citizen-scientists.html John Savard
March 18th 18 09:01 AM
by Paul Schlyter[_3_] Go to last post
6 511
Increasing exposure to space radiation means manned-flight = onlyProject Orion will work by RichA[_6_]
It's the only craft that can life enough weight to provide shielding for astronauts. https://phys.org/news/2018-03-space-increasingly-hazardous.html
March 16th 18 01:40 PM
by Chris L Peterson Go to last post
2 372
That is one insane astro camera! by RichA[_6_]
https://www.lsst.org/about 10,500mm f/1.25, 3GP sensor array and a 27ft diameter mirror. Able to scan its whole sky in...3 nights?!
March 16th 18 12:54 PM
by StarDust Go to last post
7 503
Equinox image 2018 by Gerald Kelleher
https://epic.gsfc.nasa.gov/ For whatever reason known only to themselves, NASA has decided not to represent the images of the Earth with a constant 23 1/2...
March 10th 18 07:51 AM
by Gerald Kelleher Go to last post
1 456
Webb cost climbing over $8 billion from $1 billion estimate. delays imminent by RichA[_6_]
http://www.skyandtelescope.com/astronomy-news/james-webb-space-telescope-additional-delays-likely/
March 7th 18 07:56 AM
by Chris.B[_3_] Go to last post
5 642
Real astronomical challenges by Gerald Kelleher
The partitioning of direct/retrogrades by perspective is immediately apparent in terms of the illusory loops of the slower moving outer planets and the actual...
(Multi-page thread 1 2 3)
March 2nd 18 06:21 PM
by Quadibloc Go to last post
21 880
Polar astronomy revisited by Gerald Kelleher
On Friday, March 2, 2018 at 8:32:00 AM UTC, Gerald Kelleher wrote: https://www.youtube.com/watch?v=MdFrE7hWj0A The animation is notable for a number of...
March 2nd 18 11:06 AM
by [email protected] Go to last post
1 406
Polar astronomy revisited by Gerald Kelleher
https://www.youtube.com/watch?v=MdFrE7hWj0A The animation is notable for a number of reasons however , in this case, it is applied to observing at the...
March 2nd 18 08:31 AM
by Gerald Kelleher Go to last post
0 449
NASA's biggest worry right now: What if something goes wrong with the Webb telescope? by Davoud[_1_]
Chris.B: How does an impoverished country, so deeply in debt, like the USA, manage such costly exercises? Impoverished? Really? I should get out...
(Multi-page thread 1 2 3 ... Last Page)
March 2nd 18 07:37 AM
by Chris.B[_3_] Go to last post
170 4,475
Polar evening by Gerald Kelleher
https://www.usap.gov/videoclipsandmaps/spwebcam.cfm In about a month, the forward motion of the Earth through space will turn the South pole through the...
February 28th 18 08:28 AM
by Gerald Kelleher Go to last post
4 471
Webb images are not going to be like Hubble's. It'll be basically monochromatic by RichA[_6_]
It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images...
(Multi-page thread 1 2)
February 23rd 18 06:27 PM
by Chris L Peterson Go to last post
12 678
Amateur sees supernova at first light by RichA[_6_]
https://phys.org/news/2018-02-amateur-astronomer-captures-rare-massive.html
February 23rd 18 07:45 AM
by RichA[_6_] Go to last post
0 454
Supernova research by Gerald Kelleher
http://www.latimes.com/science/sciencenow/la-sci-sn-supernova-birth-camera-20180221-story.html Rather than consider certain supernova as the death of a star,...
February 22nd 18 08:52 AM
by Gerald Kelleher Go to last post
0 349
Gravitational lenses. I don't think this was ever followed-up on by RichA[_6_]
I saw this in a 1966 Sky & Tel. Since it happened in 1988, the event proceeded existing proof of lensing, but his would have been "real-time" and not just a...
February 20th 18 04:16 AM
by Gerald Kelleher Go to last post
1 409
Earth and moon from space by Gerald Kelleher
https://www.sciencealert.com/images/2018-02/earth-moon_navcam1.jpg Lovely to appreciate as an astronomer within context of the motions of planets and moons in...
February 19th 18 05:39 PM
by Gerald Kelleher Go to last post
0 474
NASA's biggest worry right now: What if something goes wrongwith the Webb telescope? by Chris.B[_3_]
On Saturday, 10 February 2018 02:34:20 UTC+1, RichA wrote: On Friday, 9 February 2018 19:32:52 UTC-5, Chris L Peterson wrote: On Fri, 9 Feb 2018...
(Multi-page thread 1 2)
February 18th 18 12:11 AM
by Chris L Peterson Go to last post
17 939
People without integrity by Gerald Kelleher
https://apod.nasa.gov/apod/ap170319.html A planet with a zero degree inclination !!! A pivoting circle of illumination off the Equator !!!. The line...
February 15th 18 07:22 PM
by Gerald Kelleher Go to last post
4 477
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