Replies to Cosmic Ancestry, 2018...the scientific process is prone to human frailties, including vanity, envy, competition, greed, and narcissism. Anyone who claims that these things don't exist in science is either lying or willfully ignorant. Mark C. Serreze, Science, 23 Mar 2018.
Contact-binary comets | from Dave Carlson | 24 May 2018
Dear Brig Klyce, I greatly admire your website. I particularly like the article, Metazoan Genes Older Than Metazoa? I suspect the anomalously-old convergence date based on gene divergence is telegraphing something more profound than we yet realize.
I recently read, Cause of Cambrian Explosion -- Terrestrial or Cosmic?, which discusses the importance of radioactive melting of water ice in large minor planets >1000 km. I spy another 'aqueous differentiation' (melting of water ice) mechanism inadvertently revealed in a recent arXiv publication:
The Plutino population: An Abundance of contact binaries (2018) suggests that a sizable fraction of Plutinos, and by extension other minor planet populations, have experienced binary merger, which would catastrophically melt saltwater oceans in their cores, albeit briefly following binary merger. The Jupiter-family 'rubber ducky comet', 67P/Churyumov–Gerasimenko, is the poster child of contact binaries.
I've long suspected that the prevalence of contact-binaries in the asteroid and comet population, and now Plutinos, are evidence for minor planet formation by gravitational (streaming) instability, which tends to form similar-size, similar-color twin-binary pairs in wide binary orbits. Then wide binaries presumably evolve into contact binaries by way of sustained orbital perturbation, causing gentle binary spiral-in mergers, as over against orbital collisions, which cause craters and fragmentation.
contact binaries presumably by binary spiral-in mergers, by way of sustained orbital perturbation. In the case of Plutinos and KBO cubewanos, the relevant orbital perturbation presumably occurred during the late heavy bombardment.
Dave Carlson | Philadelphia
indisputable? | from John Lattanzio to Ted Steele et al. | 20 May 2018
Hi All -- to describe octopuses origins beyond the Earth as "indisputable" seems to be a bridge too far....!
I would say its not impossible and may be plausible. But far from "indisputable"..... Am I missing something??
Again - as someone new to the field - claiming beyond what can be truly defended to a skeptic does not do any good. If ne claim is seen as rubbish then people don;t listen to the rest. That is bad...
The fault is theirs! But humans are humans....we have to work with them :-)
JL | Professor John Lattanzio | School of Physics and Astronomy | Monash University | Victoria 3800 AUSTRALIA
20 May 2018 | 3:44 AM | from Ted Steele
1. The Murchison meteorite (landed in Murchison, Victoria in 1969 and was immediately recovered, and curated in the city museum in Melbourne). It has eukaryotic fossils, at > 4.5 billion years old - older than the Solar System. EM Scans of internal sliced structures independently assessed by highly reputable workers show distinct biological cells and microfossils (some look like fruiting bodies typical of slime molds). A critic must now give an explanation that avoids Panspermia for that finding. There are other carbonaceous meteorites with microfossils examined the same way. Contamination has been ruled out (Pflug and Heinz 1997, Hoover 2005, 2011, Miyake et al 2010). Thus eukayotic life is external to the Earth and at least >4.5 Billion years old.
2. The infra red extinction spectrum for interstellar cosmic dust in our Milky Way galaxy has the same signature as freeze dried E. coli (a common complex living cell). All our knowledge of the Universe, delivered by the scientific discipline of "Astronomy" has been built this way - get the spectrum (emission, absorption) in the laboratory on Earth- then focus the telescope on a cosmic source/object and ask - What is the spectrum or signature? Does it match that found in the Earth-based laboratory? All our chemical and physical knowledge of the Sun, other planets, comets, other stars etc. has been built up this way. Newton built his grand synthesis that way. As did Galileo and Kepler. Hoyle and Wickramasignhe predicted the match before they secured the astronomical observations (with Chandra's brother Dayal Wickramasinghe and DA Allen at the ANU in Canberra):
The same match is seen in cometary ejecta tails (Halleys). We cover all this in the review (see Fig 1 and associated text, Hoyle et al 1982, 1984, Wickramsinghe DT and Allen 1986). Again, a critic must provide a better explanation that avoids Panspermia, that is , better than that published by Hoyle, Wickramasinghe et al. In 40 years no astronomer or physicist has provided a better explanation, but many astronomers have observed the match. It is an exact match - you cannot get better than that in Science.
I got involved with Chandra and his colleagues because I knew that anyone calling themselves a "Scientist" and looking at the "extraordinary data" with a purely cool objective eye would draw the same conclusions as me. As a biologist am deeply immersed in RNA and DNA editing mechanisms, the Octopus RNA editing data reported last year ( I was at the GRC meeting and know the group) now place the Octopus in the class of "extraordinary genetic data"- so while some may want to pull their punches, I certainly won't. Now is not the time to be timid, as we have not published a timid paper. The prescience of the Russian space scientists detecting bacteria ( their DNA sequences) in the cosmic dust on the external surface of the ISS is another class of "extraordinary data" ( as is the Tardigrades).
Ted | Edward J Steele PhD | ASI, AIMS, ASCIA | CYO Foundation, Piara Waters, 6112 | Perth, AUSTRALIA
from Lattziano | 8:59 PM: Its a scientific discussion. Not a war. JL
from Dayal Wickramasinghe | 21 May: ...Here is how I see it (others may have different ideas).
It is possible to find non biological explanations for almost all aspects of astronomical data relating to interstellar dust when looked at in isolation. This is manly because we only have remote spectroscopic /extinction observations to play with. We have acknowledged this in our paper.
The question then is are the non-biological interpretations more plausible? We have discussed some of these and their short comings in our paper. In assessing the relevance of the biological interpretation we have to draw on the many arguments put forward by HW over the decades. The "recent" discovery of large numbers of "Earth type" planets in habitable zones makes the Copernican argument very strong.
The question then boils down to how much of the stuff out there COULD be of biological origin. If we bring in the detritus of biology into the picture (and the missing dust issue) plausibly a good proportion of it. It is hard to tell. Then comes the million dollar question - what is the source of this material assuming it exists? In our paper we discuss Proto-planetary systems with comets as the major sites of replication. The studies of comets, starting with Haley, have provided some support for this hypothesis.
We need a smoking gun. Could come from in situ cometary studies or of studies of dust falling on Earth. It may even come from studies of evolutionary biology on Earth as discussed in the Steele et al. paper. ...Cheers, Dayal
from Chandra Wickramasinghe | 21 May: I agree with Dayal. But I must add that if there is a competition between biology and non-biology in producing organics, then it is biology that always wins. This is our experience on the Earth. Furthermore, there is no evidence worth anything that supports the standard story, and Earth-origin of life is beginning to look crazy; the oldest evidence of microbial life has been pushed further and further back to almost the time when the Earth's crust was molten (Australian outcrop data, 4.2 billion years ago). And despite billions of dollars worth of effort no success in abiogenesis experiments in the laboratory. The other point is that even if life started miraculously on the Earth, it is inevitable that it is now spread from Earth throughout much of the galaxy. Episodes of impacts on the Earth splashing out biomaterial is well documented, and the solar system has come within shooting distance of very many exoplanets/protoplanets in the 240 million orbit around the galactic centre.
So my point is "life anywhere means the same life everywhere", and life must be a galactic/cosmic phenomenon with a deeply connected biosphere.
But of course we must all work within the constraints of the sociology of science. The "band wagon" has a momentum that takes much effort and persuasion to stop....
from Brig Klyce | 21 May: Dear John et al. – I apologize if this is intrusive, but, if life on Earth arrived by panspermia, the neighboring planets would have also been exposed. So there would be evidence of at least past life like ours on Mars, for example. For this I think there is a smoking gun, the fossil photographed on Mars by the Microscopic Imager camera of the Opportunity rover on 27 Feb 2004. The list of features, in my opinion, leaves no room for "reasonable doubt." (Segmenting, branching, triangular crotch, cup or "crown" structure enclosing something granular, similar sizes, and – newly noticed, to me at least – a calyx and remnant stalk.) John, if you are not aware, please take time to look. Croppings, text and original photo posted or linked at http://www.panspermia.org/whatsnew83.htm#20151028, recently updated.
That said, I agree, the gentler tone will not weaken the case. Thanks, all.Cause of Cambrian Explosion - Terrestrial or Cosmic?, the subject paper, posted 21 Mar 2018.
first civilization | from George Nickas | 20 Apr 2018
Brig, the question posted on Panspermia about another civilization on Earth pre-dating our own is interesting but a better question is how many civilizations have there been in the universe, which pre-date our own. The sheer statistics of it I believe suggest that humans are likely very much a johnny-come-lately in the vast arena of the cosmos. Here is one such answer to the question supporting that view.
There Have Probably Been Billions of Alien Civilizations by Rob Quinn, Newser.com, 07 May 2016.
What signature would our civilization leave?, the related posting of 16 Apr 2018.
Origins of Life | from Zach Burton | 24 Mar 2018
Hi Brig, ...It was great to meet you in Galveston. That was a great meeting.
I've written a book on ancient evolution of life that might be of interest to you....
Best regards, Zach Burton | Professor | MSU Evolution Since Coding (2-page book-promotion PDF)