This article was initially revealed at The Conversation. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights.Gareth Dorrian, Postdoctoral Research Fellow in Space Science, University of BirminghamA latest research claims to have discovered proof for mushroom-like life kinds on the floor of Mars. As it occurs, these explicit options are well-known and had been found by cameras aboard NASA’s Mars Exploration Rover Opportunity, shortly after it landed in 2004.They aren’t, in actual fact, dwelling organisms in any respect, however “hematite concretions” — small sphere-shaped items of the mineral hematite, and their actual origin continues to be debated by scientists. Hematite is a compound of iron and oxygen and is commercially essential on Earth. The spherical rocks on Mars could have been created by the gradual accumulation of the fabric in slowly evaporating liquid water environments. They might even have been produced by volcanic exercise.Either approach, mushrooms they aren’t. The space round Opportunity’s touchdown website is suffering from them they are often seen all around the floor and had been additionally discovered buried beneath the soil and even embedded inside rocks.Related: The weirdest Mars discoveries by NASA’s Opportunity and Spirit roversFossilized wormsThese house “mushrooms” weren’t the primary declare of alien life. On August 7, 1996, the then US president Bill Clinton stood on the White House garden and introduced the chance that scientists had found the traditional, fossilized stays of micro-organisms in a meteorite that had been recovered from Antarctica in 1984.The meteorite, ALH 84001, is one in all a handful of rocks now we have from Mars. These had been blasted off the floor of the planet by volcanic eruptions or meteorite impacts, drifted by way of house most likely for hundreds of thousands of years, earlier than ending up on Earth.High-resolution scanning electron microscope picture of the constructions. (Image credit score: NASA)The tiny constructions found inside, utilizing highly effective microscopes, resemble microscopic worm-like organisms and are more likely to be billions of years outdated. Debate over the true origins of those constructions continues right now — many scientists have identified that well-known inorganic processes are fairly able to producing constructions that resemble dwelling organisms. In different phrases, just because one thing would possibly look a bit like life (mushrooms or in any other case), that doesn’t imply it’s.Mystery gasesIn the 1970s NASA’s Viking robotic landers carried a sequence of experiments designed to check the Martian soil for the presence of microorganisms.The experiments chemically handled small samples of Martian soil in response chambers on board the landers. In one in all them, vitamins containing radioactive carbon-14 had been added to the soil samples. In principle, this must be absorbed by any rising and multiplying microbes. The carbon-14 would then more and more be “breathed out” over time, exhibiting a gentle enhance in focus inside the response chamber.After the chemical analyses, every soil pattern was steadily heated to a whole bunch of levels to destroy any microbes, with the intention of seeing whether or not any such reactions within the soil ceased. Intriguingly, this explicit experiment did present a gentle enhance in carbon-14 over time which was certainly terminated after heating to above the boiling level of water. Several inorganic chemical reactions have been proposed as a proof. These outcomes due to this fact stay inconclusive and are nonetheless debated right now.More lately, minute portions of methane have been discovered within the Martian ambiance. This can also be intriguing as dwelling organisms on Earth are recognized to launch methane. Once once more, nonetheless, it have to be harassed that this not conclusive proof of life. Methane may also be produced by a number of inorganic processes, together with by heated rocks.Wow!In 1977, the Big Ear radio telescope within the US detected an uncommon radio sign whereas scanning the sky. The sign lasted for simply a few minutes, was very high-powered and was detected over a slim vary of frequencies. These elements make it fairly tough to envisage a pure trigger, as most pure radio sources could be detected throughout a variety of frequencies.The actual sign has not been detected once more since, regardless of frequent radio surveys of the identical a part of the sky. The sign was so exceptional on the time that the astronomer on obligation, Jerry Ehman, circled the printout of the sign with a pink pen and wrote “Wow!” subsequent to it.Various explanations have been proposed through the years together with, lately, that the sign was generated by a passing comet, or transmissions from an Earth-orbiting satellite tv for pc. The actual origin of the Wow! sign continues to be not absolutely agreed upon right now and stays an intriguing thriller.Tabby’s StarA key software of planet-hunting is the dimming technique — observing mild from a star to see if it periodically dips in an everyday style as an orbiting planet passes in entrance of it. In 2015, skilled astronomers working with citizen scientists from the Planet Hunters venture introduced the invention of a close-by star displaying unusually robust and constant dimming over time.Tabby’s Star is known as after astronomer Tabitha Boyajian who was the lead creator on the paper asserting the invention. Data from the Kepler Space Telescope confirmed not only a common dimming, as one would possibly count on from a planetary orbit, however extremely irregular dips within the mild and, apparently, a constant lower in mild output over a number of years.Related: The Puzzle of ‘Tabby’s Star’: 9 explanations for star’s odd dimmingThis extremely uncommon conduct prompted quite a few theories to elucidate the observations, together with cometary mud or particles from a large affect progressively spreading out to cowl the face of the star. Some additionally speculated that these had been signatures of a sophisticated alien species constructing a construction across the star. But additional observations have discovered no corroborating proof to help this risk. For instance, radio telescopes have did not detect any uncommon radio emissions from the star. Today, the scientists behind the invention consider that the weird dips in mild are attributable to clouds of cosmic mud passing throughout the face of the star.As thrilling as they’re, you will need to deal with claims of alien life with a wholesome dose of skepticism, and that is certainly what scientists do. No conclusive proof that extraterrestrial life exists has been discovered … but.This article is republished from The Conversation below a Creative Commons license. Read the unique article.Follow all the Expert Voices points and debates — and grow to be a part of the dialogue — on Facebook and Twitter. The views expressed are these of the creator and don’t essentially replicate the views of the writer. This model of the article was initially revealed on Live Science.