Claims Of A Meteorite's Ancient Aquatic Fossils Spark Debate | WAMU 88.5 - American University Radio

NPR : News

Filed Under:

Claims Of A Meteorite's Ancient Aquatic Fossils Spark Debate

A meteorite that lit the sky over Sri Lanka with a yellow and green flame when it fell to earth on Dec. 29, 2012, contains "fossilized biological structures," according to researchers in Britain, Sri Lanka, and the United States. Elaborating on claims they first made in January, the scientists are also seeking to answer critics who are skeptical of their findings.

The team, led by Jamie Wallis of Cardiff University and Chandra Wickramasinghe, director of the Buckingham Center for Astrobiology, says that electron microscope images depict what look to be microscopic diatoms, a form of algae, along with other structures in fragments of the meteorite.

Such a finding would bolster the theory of "panspermia," which Wickramasinghe helped develop, and which posits that asteroids and other bodies spread tiny tidbits of life as they travel through space.

The study released Monday is based on a sample that was gathered by police and examined by the Medical Research Institute of the Ministry of Health in Colombo. Scientists say they later obtained 628 other samples, of which only three were found to be possible meteorite fragments.

The researchers say they analyzed the stones with a scanning electron microscope at Cardiff University, which "resulted in a number of images showing diatom frustules, some of which were clearly embedded in the rock matrix, thereby excluding the possibility of post-arrival contamination." Frustules, we should note, are the silica-based shells of diatoms.

The new study expands on a paper published in January, which reported "the discovery for the first time of diatom frustules in a carbonaceous meteorite" that fell near the historic city of Polonnaruwa.

That initial bulletin was criticized for its lack of detail on how the samples were recovered, with many observers concluding that the samples had been contaminated by water in the rice paddies that dot the region. And some have questioned whether a meteorite actually fell near Polonnaruwa. It is not registered, for instance, at the Meteoritical Society's site.

But that has not deterred the study's leaders from saying their work may represent one of the biggest scientific breakthroughs in hundreds of years. And they say the samples' extremely low levels of nitrogen provide further proof that they have found ancient fossils.

"I think the discovery of an unequivocal microbial structure such as a diatom, deeply trapped in the rock matrix, proves beyond doubt that this life existed in the parent comet from which the meteorite was derived," Wickramasinghe told Sri Lanka's The Island news site in January. "The highly intricate and woven patterns on the outer shells of diatoms are impossible to generate by any other process than biology.... The cosmic ancestry of humans becomes ever more securely established."

Technology Review, which notes that the new study must be peer-reviewed — and samples must be shared with other scientists — before its theories can be considered, also notes a couple of alternate explanations:

"One is that the fireball was of terrestrial origin, a remnant of one of the many asteroid impacts in Earth's history that that have ejected billions of tonnes of rock and water into space, presumably with biological material inside. Another is that the structures are not biological and have a different explanation."

After the January study was published, astonomer Phil Plait wrote a detailed and deeply skeptical review of the findings for Slate. In short, he said the researchers were wrong — or, as he put it, "meteorwrong."

Plait consulted evolutionary biology professor Patrick Kociolek of the University of Colorado at Boulder, who found that "the 'source' of the diatoms from outer space, must have gone through the same evolutionary events as here on earth." The sample, Kociolek said, was clearly contaminated.

This afternoon, Plait offered an analysis of the new study, in which he remains unconvinced of its merits.

Both of the studies by Wallis, Wickramasinghe, and their colleagues were published in The Journal of Cosmology, which has previously been moved to defend its articles, including a 2011 paper that stated "structures in rare meteorites appear to be microscopic fossils of extraterrestrial beings that resemble algae known as cyanobacteria," as The Guardian reported.

The skeptical response to that article, The Journal of Cosmology's editors wrote, caused them to reminisce about "totalitarian states and theocracies, where defenders of the faith, and Grand Inquisitors, armed with their Bibles, threatened, tortured, and killed those who challenged prevailing dogma." The Journal's editorial statement was posted by David Dobbs for the Neuron Culture blog at Wired.

Copyright 2013 NPR. To see more, visit http://www.npr.org/.

NPR

A Short List Of The Best 'Longform' Journalism Of 2014

Editors at Longform read hundreds of print and online journalism pieces each year. Co-founder Max Linsky talks to Audie Cornish about highlights from 2014, from literary stalwarts and upstarts alike.
NPR

Nutmeg Spice Has A Secret Story That Isn't So Nice

Nutmeg is a feel-good holiday spice. But it once caused serious bloodshed and may have even been a reason the Dutch were willing to part with Manhattan in the 1600s.
WAMU 88.5

Special Prosecutors Should Handle Civilian Shootings By Police, Holmes Norton Says

Norton says mayors and governors could stem anger over civilian shootings by police by appointing special prosecutors to handle them.
NPR

2014 Hashtags: #MuslimApologies Grew Out Of Both Anger And Whimsy

Maha Hilal helped launch #MuslimApologies partly as a rebuttal to the more earnest hashtag, #NotInOurName. She tells Audie Cornish how it reflects a divisive conversation in the Muslim community.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.