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Geology

Mars atmosphere history unveiled by meteorite

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Meteorite from Mars contains evidence of evaporated water

A meteorite from Mars has been in researchers’ labs since the 1980s, when it was first discovered in the Allan Hills in Antarctica. 2014 ended with scientists finding out new things about Mars’ atmosphere by examining the Allan Hills 84001, as the meteorite was dubbed. By analyzing meteorites such as the Allan Hills 84001, scientists can pinpoint the age of the rock, as well as learn about how Mars’ atmosphere functioned billions of years ago.

Even though massive breakthroughs have been made about Mars, including the discovery of water and hydrogen on the planet, long evaporated, as well as methane jets that had been lurking in the dry lakes of the planet, the new data obtained through the analysis of the meteorite gives us further understanding about the universe. According to researchers, the meteorite from Mars is about 3.9 billion years old, which means that it was formed during the Noachian era of Mars, when water was still present in its liquid form on the planet. From their analysis, we can understand that the Mars meteorite had made contact with water billions of years ago, proving that there was life once on the Red Planet.

Even though researchers are pretty confident in their findings, they stress the fact that the meteorite might not be valid proof of water on Mars just yet, since it could have made contact with water at a later time. We could assume that maybe water was present on the Red Planet for much longer than we could have thought, and the meteorite could have picked it up at a later time. At the same time, the oxygen compounds that indicate water on the meteorite might come from something else than our life-giving liquid. The new discoveries can not be held as proof of life on Mars just yet, but with further analysis, researchers can develop and sustain these ideas and bring forth more discoveries about the atmosphere of Mars throughout history.

As part of the editorial team here at Geekreply, John spends a lot of his time making sure each article is up to snuff. That said, he also occasionally pens articles on the latest in Geek culture. From Gaming to Science, expect the latest news fast from John and team.

Geology

Mexican Congress hears UFOs with ‘alien’ bodies

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(Reuters). Mexico’s first congressional UFO hearing featured “we are not alone” and alleged non-human remains.

Politicians were shown two artifacts that Mexican journalist and longtime UFO enthusiast Jaime Maussan claimed were extraterrestrial corpses at the Tuesday hearing on FANI.

Maussan said The specimens were unrelated to Earthly life.

Two tiny “bodies,” displayed in cases, have elongated heads and three fingers each. Maussan said they were found in Peru near Nazca Lines in 2017. He estimated their age at 1,000 years using Mexico’s National Autonomous University’s carbon dating.

Mummified children were once found.

Maussan presented such evidence first.

“I think there is a clear demonstration that we are dealing with non-human specimens that are NOT related to any other species in our world and that any scientific institution can investigate it,” Maussan said.

“We are not alone,” he said.

“I can affirm that these bodies have no relation to human beings.”

Thursday, UNAM republished a 2017 statement saying its National Laboratory of Mass Spectrometry with Accelerators (LEMA) only wanted sample ages.

“In no case do we make conclusions about said samples’ origin,” it said.

Congress heard from former Navy pilot Ryan Graves about UAP sightings and the stigma of reporting them.

Sergio Gutierrez, a Morena congressman for President Andres Manuel Lopez Obrador, hoped the hearing would be the first of many in Mexico.

“We are left with reflections, concerns, and how to continue discussing this,” Gutierrez said.

Recent years have seen the U.S. government release UAP data after decades of denial. In recent years, NASA’s first independent UFO panel and the Pentagon have investigated military aviator sightings.

NASA will discuss study results Thursday.

Skeptics slammed Maussan’s Wednesday presentation.

“This could really hurt efforts to take the issue seriously,” tweeted. “Why didn’t they publish it after a scientific paper?”

X-rays, 3-D reconstruction, and DNA analysis were done on the remains, according to Mexican navy Scientific Institute for Health Director Jose de Jesus Zalce Benitez.

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Biology

New Evidence Modifies Homo sapiens Chronology and Behavior

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Homo sapien skulls from Jebed Irhoud
Two reconstructed Homo sapiens skulls recovered from the excavations at Jebel Irhoud, Morocco.

Earlier this month, researchers published an article outlining new evidence from an excavation in Jebel Irhoud (Morocco) that provides the earliest date yet for the presence of Homo sapiens. A variety of dating methods provide an age of about 315,000 years ago (kya). Prior to this, the earliest securely dated evidence for Homo sapiens were the bones from the Omo Kibish site in Ethiopia dating to about 195 kya.

The decades-long excavation at Jebel Irhoud has uncovered various types of palaeo archaeological data. The skeletal material (e.g. skull, mandible, teeth, humerus, hip bone) shows that there were at least five individuals. The assemblage of stone tools includes examples of the Mousterian industry and the Levallois napping technique. Both of these are closely associated with Neanderthals (Homo neanderthalensis), though are not exclusive to the species. Also, the majority of the tools were made from stone not native to the Jebed Irhoud area. Other recovered evidence includes examples of fire use and animal bones (primarily gazelle) showing signs of hunting and butchering.

Dating Methods

A variety of dating techniques helped establish the age of the new assemblage at 315 kya. The research team measured sediment from the different stratigraphic levels for the quantity of radiation present. They used electron spin resonance on bone samples. Finally, the researchers applied thermoluminescence to the stone tools that were in direct association with the bones. Unfortunately, the research team was unable to extract DNA from the bones.

Homo sapiens stone tools from Jebel Irhoud, Morocco

Samples of stone tools recovered from Jebel Irhoud (Morocco).

Importance of Evidence

The importance of the evidence is twofold. First, it secures a mature development of Homo sapiens over 100,000 years earlier than previous evidence indicated. The date does not remove the firm placement of Homo sapiens within the Middle Pleistocene and during the Middle Palaeolithic. However, a date of 315 kya does provide overlap with the existence of Homo heidelbergensis. Previous evidence indicated that Homo sapiens developed from Homo heidelbergensis between 300 – 200 kya. The Jebel Irhoud data do not exclude this hypothesis but it means that Homo sapiens must have developed much earlier, probably closer to the nadir of Homo antecessor. It also means that Homo sapiens had much longer contemporaneity with Homo erectus than previously known.

The second important aspect is the location of the finds. Morocco is around 3,400 miles from Ethiopia. The prevailing models of human evolution place the development of Homo sapiens in Ethiopia. This makes sense based on the quantity and age of data recovered from sites in Ethiopia and in East Africa. The location of the new finds, and the fact that the fossils represent developed Homo sapiens, indicate that our ancestors had already moved across the continent in viable population sizes so the broad evolutionary changes that resulted in our species had already occurred.

The Jebel Irhoud evidence does not lessen the importance of East Africa in understanding the development of our species. Rather, it contributes data to provide a richer, more robust picture of hominid development and migrations across Africa and the world. It is quite exciting to imagine what else the excavation will recover to further elucidate the history of hominids and Homo sapiens. What are your thoughts?

Nature

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Astronomy

Volcanic rocks’ primordial water suggests life might be more common

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Life on other planets is considered to be a certainty, and with new evidence of the infinitely intricate details of the universe and their influence on Earth come to light more often as ever, it is undoubtable. However, in a new study involving volcanic rocks and the types of isotopes they contain revealed that life could be more common in the universe than we might have expected.

Volcanic rocks examined by Lydia Hallis and her planetary scientist colleagues revealed that the Earth might have been “born with water”. In the theory they put forward in the latest issue of Science magazine, they argue that the isotopes discovered within volcanic rocks found in Iceland and Baffin Island suggest water had been part of Earth since it first started forming within the protosolar nebula.

Based on the light hydrogen isotope ratio discovered in the volcanic rocks we mentioned earlier, the primordial water within trapped within the rocks came from the protosolar nebula. The researchers demonstrated in their paper last week that the hydrogen isotope ratio in the volcanic rocks was much lighter than ocean water, making it much older. The discovery could hold against the theory that the water on our planet came from numerous water-contaminated asteroid collisions.

The breakthrough came after scientists evaporated volcanic rocks and examined the trapped water in their insides, revealing that Earth has not in fact gathered its water isotopes over the years due to debris from outer space impacting its surface, as previous theories believed. In fact, the primordial water from within the volcanic rocks of Iceland might be straight out of the Protosolar Nebula – or the gas and hydrogen molecular clouds that eventually became the Solar System.

The theory suggests that if the Solar System’s nebular history of formation is considered, then we should be able to find many different solar systems with planets like Earth orbiting around. These planets could have actually harbored the same primordial water at one point in time in the past few billion years, and if their geology was as fortunate as Earth’s, they might have evolved in the same way our own planet has. Water may signify the presence of biological life, thus the chances of finding planets similar to Earth might be slightly higher.  The theory cannot be considered definite proof, of course, but it does propose an interesting idea.

If planets within solar systems are formed from the same materials as the primordial protosolar nebula, and are capable of retaining water in a similar manner to Earth, the possibility of finding life closer to home is greatly increased. However, that doesn’t mean that we might be closer to intelligence. You might have heard theories about inferior forms of life being closer to us than we had ever thought – on Mars, for instance. In the future, we might discover primordial water on the Red Planet.

The volcanic rocks that the scientists base their theory on can now be considered as the first evidence of primordial water on Earth. If you want to get in on the science behind analyzing these unique volcanic rocks, you can read the full study in Science magazine. The discovery is significant and brings us one step closer to identifying the first planet, aside from Earth, harboring biological life.

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