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“Map Of Life” predicts ET. (So where is he?)

Astronomy News - 2 July 2015 - 9:41am

Extra-terrestrials that resemble humans should have evolved on other, Earth-like planets, making it increasingly paradoxical that we still appear to be alone in the universe, the author of a new study on convergent evolution has claimed.

The argument is one of several that emerge from The Runes Of Evolution, a new book in which the leading evolutionary biologist, Professor Simon Conway Morris, makes the case for a ubiquitous “map of life” that governs the way in which all living things develop.

It builds on the established principle of convergent evolution, a widely-supported theory – although one still disputed by some biologists – that different species will independently evolve similar features.

Conway Morris argues that convergence is not just common, but everywhere, and that it has governed every aspect of life’s development on Earth. Proteins, eyes, limbs, intelligence, tool-making – even our capacity to experience orgasms – are, he argues, inevitable once life emerges.

The book claims that evolution is therefore far from random, but a predictable process that operates according to a fairly rigid set of rules.

If that is the case, then it follows that life similar to that on Earth would also develop in the right conditions on other, equivalent planets. Given the growing number of Earth-like planets of which astronomers are now aware, it is increasingly extraordinary that aliens that look and behave something like us have not been found, he suggests.

“Convergence is one of the best arguments for Darwinian adaptation, but its sheer ubiquity has not been appreciated,” Professor Conway Morris, who is a Fellow at St John’s College, University of Cambridge, said.

“Often, research into convergence is accompanied by exclamations of surprise, describing it as uncanny, remarkable and astonishing. In fact it is everywhere, and that is a remarkable indication that evolution is far from a random process. And if the outcomes of evolution are at least broadly predictable, then what applies on Earth will apply across the Milky Way, and beyond.”

Professor Conway Morris has previously raised the prospect that alien life, if out there, would resemble earthlings – with limbs, heads, and bodies – notably at a Royal Society Conference in London in 2010. His new book goes even further, however, adding that any Earth-like planet should also evolve thunniform predators (like sharks), pitcher plants, mangroves, and mushrooms, among many other things.

Limbs, brains and intelligence would, similarly, be “almost guaranteed”. The traits of human-like intelligence have evolved in other species – the octopus and some birds, for example, both exhibit social playfulness – and this, the book suggests, indicates that intelligence is an inevitable consequence of evolution that would characterise extraterrestrials as well.

Underpinning this is Conway Morris’ claim that convergence is demonstrable at every major stepping stone in evolutionary history, from early cells, through to the emergence of tissues, sensory systems, limbs, and the ability to make and use tools.

The theory, in essence, is that different species will evolve similar solutions to problems via different paths. A commonly-cited example is the octopus, which has evolved a camera eye that is closely similar to that of humans, although distinctive in important ways that reflect its own history. Although octopi and humans have a common ancestor, possibly a slug-like creature, this lived 550 million years ago and lacked numerous complex features that the two now share. The camera eye of each must therefore have evolved independently.

Conway Morris argues that this process provides an underlying evolutionary framework that defines all life, and leads to innumerable surprises in the natural world. The book cites examples such as collagen, the protein found in connective tissue, which has emerged independently in both fungi and bacteria; or the fact that fruit flies seem to get drunk in the same manner as humans. So too the capacity for disgust in humans – a hard-wired instinct helping us avoid infection and disease – is also exhibited by leaf-cutter ants.

The study also identifies many less obvious evolutionary “analogues”, where species have evolved certain properties and characteristics that do not appear to be alike, but are actually very similar. For example, “woodpeckerlike habits” are seen in lemurs and extinct marsupials, while the mechanics of an octopus’ tentacles are far closer to those of a human arm than we might expect, and even their suckers can operate rather like hands.

Conway Morris contends that all life navigates across this evolutionary map, the basis of what he describes as a “predictive biology”. “Biology travels through history,” he writes, “but ends up at much the same destination”.

This, however, raises fascinating and problematic questions about the possibility of life occurring on other planets. “The number of Earth-like planets seems to be far greater than was thought possible even a few years ago,” Conway Morris said. “That doesn’t necessarily mean that they have life, because we don’t necessarily understand how life originates. The consensus offered by convergence, however, is that life is going to evolve wherever it can.”

“I would argue that in any habitable zone that doesn’t boil or freeze, intelligent life is going to emerge, because intelligence is convergent. One can say with reasonable confidence that the likelihood of something analogous to a human evolving is really pretty high. And given the number of potential planets that we now have good reason to think exist, even if the dice only come up the right way every one in 100 throws, that still leads to a very large number of intelligences scattered around, that are likely to be similar to us.”

If this is so, as the book suggests in its introduction, then it makes Enrico Fermi’s famous paradox – why, if aliens exist, we have not yet been contacted – even more perplexing. “The almost-certainty of ET being out there means that something does not add up, and badly,” Conway Morris said. “We should not be alone, but we are.”

The Runes Of Evolution was six years in the making and draws on thousands of academic sources, and throws up numerous other, surprising findings as well. Sabre-teeth, for example, turn out to be convergent, and Conway Morris explains why it is that the clouded leopard of Asia, Neofelis nebulosa, has developed features that could, as it evolves “presage the emergence of a new sabre-tooth”, although sadly it looks set to become extinct before this happens. Elsewhere, the study suggests that certain prehistoric creatures other than bats and birds may have attempted to evolve flight.

“It makes people slightly uneasy that evolution can end up reaching the same solutions to questions about how to catch something, how to digest something, and how to work,” Conway Morris added. “But while the number of possibilities in evolution in principle is more than astronomical, the number that actually work is an infinitesimally smaller fraction.”

The Runes Of Evolution, by Simon Conway Morris, is published by Templeton Press

Inset images:
Top: Shark by Jeff Kubina; Pitcher Plant by NH53; Mangrove by Roberto Verzo; Mushroom by Aleksey Gnilenkov
Middle: Disgust by Stuart Hamilton; Leaf Cutter Ants by Steve Corey
Bottom: Saber-tooth Cat by Chuck Peterson

The author of a new study of evolutionary convergence argues that the development of life on Earth is predictable, meaning that similar organisms should therefore have appeared on other, Earth-like planets by now.

The almost-certainty of ET being out there means that something does not add up, and badly. We should not be alone, but we are.Simon Conway MorrisAlbert Kok, via Flickr. Homepage image: Eye of the Octopus by Klaus StiefelThe camera eye of an octopus is structurally similar to that of a human, but has evolved independently, making it a classic example of convergent evolution.

The text in this work is licensed under a Creative Commons Attribution 4.0 International License. For image use please see separate credits above.

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Probe refines Pluto flyby path

Astronomy News - 2 July 2015 - 9:33am

The American New Horizons spacecraft makes its last planned targeting manoeuvre as it bears down on Pluto.

Rosetta spies cometary sinkholes

Astronomy News - 2 July 2015 - 9:33am

The comet being studied by Europe’s Rosetta probe is riddled with pits that formed much like sinkholes here on Earth, say scientists.

VIDEO: Leap second: What does it mean?

Astronomy News - 1 July 2015 - 9:21am

Midnight will come later tonight, as for the first time in three years, an extra second is added to the official time set by atomic clocks.

Misbehaving pulsar's sudden slow-down may teach us how they tick

Astronomy News - 30 June 2015 - 9:45am

A bright young pulsar that seemed to be stable has slammed on its brakes. Understanding this shift in behaviour could help astronomers calibrate cosmic clocks

'Leap second' delays midnight

Astronomy News - 30 June 2015 - 9:33am

Midnight came later on Tuesday as for the first time in three years an extra second was added to the official time set by atomic clocks.

Handprints on Hubble

Astronomy News - 29 June 2015 - 10:28am
As the Hubble Space Telescope celebrates its 25th anniversary, scientists are reflecting on the key role astronauts played in allowing the telescope to continue making great discoveries.

Rainbow X-ray echoes pinpoint faraway neutron star

Astronomy News - 29 June 2015 - 10:27am

By observing ripples of X-rays bouncing off dust around a remote binary star, astronomers have solved a puzzle over its distance

Galaxy's supermassive black hole is a cool neighbourhood for ice

Astronomy News - 29 June 2015 - 10:26am

Despite searing radiation at the Milky Way's core, water and hydrocarbon ice are clinging on – probably thanks to sheltering dust grains

Monster black hole wakes up after 26 years

Astronomy News - 26 June 2015 - 9:33am

Over the past week, ESA's INTEGRAL satellite has been observing an exceptional outburst of high-energy light produced by a black hole that is devouring material from its stellar companion.

Giant Galaxy is Still Growing

Astronomy News - 26 June 2015 - 9:30am
New observations with ESO’s Very Large Telescope have revealed that the giant elliptical galaxy Messier 87 has swallowed an entire medium-sized galaxy over the last billion years. For the first time a team of astronomers has been able to track the motions of 300 glowing planetary nebulae to find clear evidence of this event and also found evidence of excess light coming from the remains of the totally disrupted victim.

Exposed water ice detected on comet's surface

Astronomy News - 25 June 2015 - 9:38am

Using the high-resolution science camera on board ESA's Rosetta spacecraft, scientists have identified more than a hundred patches of water ice a few metres in size on the surface of Comet 67P/Churyumov-Gerasimenko.

Hubble sees atmosphere being stripped from Neptune-sized exoplanet [heic1515]

Astronomy News - 25 June 2015 - 9:38am

Astronomers using the NASA/ESA Hubble Space Telescope have discovered an immense cloud of hydrogen dispersing from a warm, Neptune-sized planet orbiting a nearby star. The enormous gaseous tail of the planet is about 50 times the size of the parent star. The findings will be published in the 25 June issue of the journal Nature.

Hubble Sees a 'Behemoth' Bleeding Atmosphere Around a Warm Neptune-Sized Exoplanet

Astronomy News - 25 June 2015 - 9:33am

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Astronomers using NASA's Hubble Space Telescope have discovered an immense cloud of hydrogen dubbed "The Behemoth" bleeding off a planet orbiting a nearby star. The enormous, comet-like feature is about 50 times the size of the parent star. The hydrogen is evaporating from a warm, Neptune-sized planet, due to extreme radiation from the star. A phenomenon this large has never before been seen around any exoplanet. It may offer clues to how Super-Earths massive, rocky, versions of Earth are born around other stars through the evaporation of their outer layers of hydrogen. Finding "The Behemoth" could be a game-changer for characterizing atmospheres of the whole population of Neptune-sized planets and Super-Earths in ultraviolet observations.

Construction resumes on Hawaii's Thirty Meter Telescope

Astronomy News - 25 June 2015 - 9:31am

After a two-month pause and potential game over, construction on the biggest telescope on Mauna Kea will resume – but protests continue

A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b

Astronomy News - 25 June 2015 - 9:29am

A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b

Nature 522, 7557 (2015). doi:10.1038/nature14501

Authors: David Ehrenreich, Vincent Bourrier, Peter J. Wheatley, Alain Lecavelier des Etangs, Guillaume Hébrard, Stéphane Udry, Xavier Bonfils, Xavier Delfosse, Jean-Michel Désert, David K. Sing & Alfred Vidal-Madjar

Exoplanets orbiting close to their parent stars may lose some fraction of their atmospheres because of the extreme irradiation. Atmospheric mass loss primarily affects low-mass exoplanets, leading to the suggestion that hot rocky planets might have begun as Neptune-like, but subsequently lost all of their atmospheres; however, no confident measurements have hitherto been available. The signature of this loss could be observed in the ultraviolet spectrum, when the planet and its escaping atmosphere transit the star, giving rise to deeper and longer transit signatures than in the optical spectrum. Here we report that in the ultraviolet the Neptune-mass exoplanet GJ 436b (also known as Gliese 436b) has transit depths of 56.3 ± 3.5% (1σ), far beyond the 0.69% optical transit depth. The ultraviolet transits repeatedly start about two hours before, and end more than three hours after the approximately one hour optical transit, which is substantially different from one previous claim (based on an inaccurate ephemeris). We infer from this that the planet is surrounded and trailed by a large exospheric cloud composed mainly of hydrogen atoms. We estimate a mass-loss rate in the range of about 108–109 grams per second, which is far too small to deplete the atmosphere of a Neptune-like planet in the lifetime of the parent star, but would have been much greater in the past.

Galaxies at redshifts 5 to 6 with systematically low dust content and high [C ii] emission

Astronomy News - 25 June 2015 - 9:29am

Galaxies at redshifts 5 to 6 with systematically low dust content and high [C ii] emission

Nature 522, 7557 (2015). doi:10.1038/nature14500

Authors: P. L. Capak, C. Carilli, G. Jones, C. M. Casey, D. Riechers, K. Sheth, C. M. Carollo, O. Ilbert, A. Karim, O. LeFevre, S. Lilly, N. Scoville, V. Smolcic & L. Yan

The rest-frame ultraviolet properties of galaxies during the first three billion years of cosmic time (redshift z > 4) indicate a rapid evolution in the dust obscuration of such galaxies. This evolution implies a change in the average properties of the interstellar medium, but the measurements are systematically uncertain owing to untested assumptions and the inability to detect heavily obscured regions of the galaxies. Previous attempts to measure the interstellar medium directly in normal galaxies at these redshifts have failed for a number of reasons, with two notable exceptions. Here we report measurements of the forbidden C ii emission (that is, [C ii]) from gas, and the far-infrared emission from dust, in nine typical star-forming galaxies about one billion years after the Big Bang (z ≈ 5–6). We find that these galaxies have thermal emission that is less than 1/12 that of similar systems about two billion years later, and enhanced [C ii] emission relative to the far-infrared continuum, confirming a strong evolution in the properties of the interstellar medium in the early Universe. The gas is distributed over scales of one to eight kiloparsecs, and shows diverse dynamics within the sample. These results are consistent with early galaxies having significantly less dust than typical galaxies seen at z < 3 and being comparable in dust content to local low-metallicity systems.

Astrophysics: Dust-poor galaxies at early times

Astronomy News - 25 June 2015 - 9:29am

Astrophysics: Dust-poor galaxies at early times

Nature 522, 7557 (2015). doi:10.1038/522422a

Authors: Veronique Buat

Observations of galaxies that formed early in the Universe's history reveal much lower dust levels than are found in sources from a slightly later era. It seems that galaxies underwent rapid change during a relatively short period. See Letter p.455

Planetary science: Space-rock alert

Astronomy News - 25 June 2015 - 9:28am

Planetary science: Space-rock alert

Nature 522, 7557 (2015). doi:10.1038/522418a

Author: Alexandra Witze

Alexandra Witze watches a pair of films on asteroids — according to many, a vast accident waiting to happen.

Private asteroid hunt lacks cash to spy threats in orbit

Astronomy News - 25 June 2015 - 9:27am

Private asteroid hunt lacks cash to spy threats in orbit

Nature 522, 7557 (2015).

Author: Traci Watson

Foundation fails to raise funds it needs for a space telescope to catalogue near-Earth objects.