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"Did Life First Appear on Alien Worlds 12-13 Billion Years Ago?"

"Did Life First Appear on Alien Worlds 12-13 Billion Years Ago?"
This means that planets that could potentially have supported life may have formed eight, ten, maybe even twelve billion years ago. Surveys do detect a decrease in the number of planet-hosting stars with decreasing metallicity, but this drop is much shallower for terrestrial planets than it is for gas giants. Of course, the presence of some heavy elements during the planet-building phases is required, but the minimum level has not yet been determined. The raw materials for building terrestrial planets were available very soon after the Big Bang, raising the possibility that there could be life in the Universe far older than ours. Perhaps they reside around long-lived red dwarf stars, or have moved on from their home system after their star expired. Or, perhaps, we really are the first, which means that if life has happened just once throughout the entire history of the Universe, our existence must be a fluke and our planet very, very special indeed. Journal reference: Nature Related:  Planets15

"Humans May be the First Generation of Advanced Life in the Milky Way" and conduct commerce with them,” Sasselov said. “We don’t now have the technology to physically travel outside our solar system for such an exchange to take place, but we are like Columbus centuries ago, learning fast how to get somewhere few think possible.” Sasselov believes that life is probably common in the universe. He said that he believes life is a natural “planetary phenomenon” that occurs easily on planets with the right conditions. “It takes a long time to do this,” Sasselov said at a 2011 Harvard conference. “It may be that we are the first generation in this galaxy.” Though it may be hard to think of it this way, at roughly 14 billion years old, the universe is quite young, he said. If life did develop elsewhere, adds Andrew Knoll, the Fisher Professor of Natural History using the lessons of planet Earth to give an idea of what it might take to develop intelligence.

Giant System of Exo-Planets Discovered Orbiting a Young Star By measuring the density of dust in the densest part of the ring, the astronomers found that it is highly possible that Jupiter-like giant gaseous planets or Earth-like rocky planets are now being formed in that region. This region is far from the central star, about 5 times larger than the distance between the Sun and the Neptune. This is the first firm evidence of planet formation found so far from the central star in a protoplanetary disk. The research team plans further observations of HD142527 with ALMA for closer investigation, as well as other protoplanetary disks to have a comprehensive understanding of the planet formation in general. More than 1000 extrasolar planets have been discovered until now, and it is widely recognized that the Sun is not the only star which has planets. An infant star is surrounded by a ring of dust and gas, which would be the component material of planets. Spiral or gap structures are thought to be associated with hidden planets in the disk.

Brasileirão 2015 ao vivo, resultados Futebol Brasil - Resultados.com Seu navegador é muito antigo. Algumas partes do site podem não funcionar corretamente. Por favor atualize o seu navegador para garantir a exibição correta do site. Nós recomendamos: Chrome | Firefox | Explorer | Opera | Safari results fixtures Strange life signs found on meteorites WASHINGTON, D.C. - A NASA scientist reports detecting tiny fossilized bacteria on three meteorites, and maintains these microscopic life forms are not native to Earth. If confirmed, this research would suggest life in the universe is widespread and life on Earth may have come from elsewhere in the solar system, riding to our planet on space rocks like comets, moons and other astral bodies. The study, published online late Friday in The Journal of Cosmology, is considered so controversial it is accompanied by a statement from the journal's editor seeking other scientific comment, which is to be published starting on Monday. The central claim of the study by astrobiologist Richard Hoover is that there is evidence of microfossils similar to cyanobacteria — blue-green algae, also known as pond scum — on the freshly fractured inner surfaces of three meteorites. He is not the first to claim discovery of microscopic life from other worlds. Hoover's research may well meet the same fate. "Dr.

Best Photo Yet of An Exoplanet It's just a few small pixels, but the image above marks a giant leap for our capacity to explore worlds beyond the influence of the sun. Taken with the Gemini Planet Imager, recently fitted to the Gemini South telescope in Chile, the bright dot represents Beta Pictoris b, one of the most famous planets beyond the solar system. The larger circle, looking like the freeze frame of a drop of water after it has landed on a pond, is centred on the star Beta Pictoris itself, after its light was subtracted so that it would not overwhelm the planet itself. The Planet Imager was specifically designed for such work, with “Advanced adaptive optics, diffraction control, a near-infrared spectrograph, and an imaging polarimeter” according to the team that took this image. The twenty one institutions that came together to make the image possible hailed the photo as “an order of magnitude better than conventional adaptive optics imagers” . Future targets will be harder, however. Photo Gallery

The Ultimate List of Free Content Creation Tools & Resources Creating content isn't always a walk in the park. (In fact, it can sometimes feel more like a sprint in a swamp.) While other parts of business and marketing are becoming increasingly automated, content creation is still a very manual job. That being said, there are plenty of tools out there to make creating content much easier. Click here to download our full collection of content creation templates for blog posts, ebooks, infographics, and more. Below, you'll find a list of 28 fantastic tools and resources to help you research, write, edit, and design content more easily. Let's get started. 28 Free Tools & Resources to Make Content Creation Easier For Researchers 1) Google Drive Research Tool Google recently added a tool to Drive that allows you to conduct Google searches without ever leaving your Drive window. 2) Site:search This is a handy Google hack I use every day. 3) Google Webmaster Tools Doing SEO and keyword research? 4) Percentage Change Calculator 5) Search in a Giphy For Writers

Astrophile: Rhythmic dance helps star lovers mature - space - 19 July 2013 Astrophile is our weekly column on curious cosmic objects, from the solar system to the far reaches of the multiverse Objects: Harmonious binary starsTemperaments: Mature beyond their years When two young stars get together, it is never clear how their relationship will play out. Should the pair fail to get along, anyone caught in their path is at risk from violent fallout. But if they are able to settle into a decent rhythm, the stars can grow old together in harmony – and maybe even foster new life. In fact, computer models suggest that pairs of stars that orbit each other, known as binaries, can be even more hospitable to life than solo stars like our sun, if their relationship helps them to mature quickly. Astronomers previously thought the complex gravitational forces around binaries would prevent them from even giving birth to planets. Spin cycle Young stars start out with volatile temperaments, which is bad news for nearby planets. Millions more More From New Scientist Recommended by

Transiting Exoplanet With Longest Year Discovered Astronomers have identified an exoplanet that has the longest year ever discovered outside of our solar system at 704 days. The research was lead by David Kipping of the Harvard-Smithsonian Center for Astrophysics and has been accepted for publication in The Astrophysical Journal. Kepler-421b is about 1,000 light-years away in the constellation Lyra. It is about the same size as Uranus and exists over 177 million km away from its orange K-type parent star, taking 704 days to complete a single orbit. Exoplanets are typically identified when they transit their parent star, blocking out some of the light. The planet was spotted with NASA’s Kepler telescope. "Finding Kepler-421b was a stroke of luck," Kipping explained in a press release. Kepler-421b’s position is also helping to explain some aspects of planetary formation. "The snow line is a crucial distance in planet formation theory.

HTG Explains: The Difference Between WEP, WPA, and WPA2 Wireless Encryption (and Why It Matters) Even if you know you need to secure your Wi-Fi network (and have already done so), you probably find all the encryption acronyms a little bit puzzling. Read on as we highlight the differences between encryption standards like WEP, WPA, and WPA2–and why it matters which acronym you slap on your home Wi-Fi network. What Does It Matter? You did what you were told to do, you logged into your router after you purchased it and plugged it in for the first time, and set a password. WEP, WPA, and WPA2: Wi-Fi Security Through the Ages Since the late 1990s, Wi-Fi security algorithms have undergone multiple upgrades with outright depreciation of older algorithms and significant revision to newer algorithms. Wired Equivalent Privacy (WEP) Wired Equivalent Privacy (WEP) is the most widely used Wi-Fi security algorithm in the world. WEP was ratified as a Wi-Fi security standard in September of 1999. Wi-Fi Protected Access (WPA) Wi-Fi Protected Access II (WPA2) Wi-Fi Security History Acquired; Now What?

Only the toughest would survive on Tatooine worlds - space - 07 January 2013 If creatures exist on planets with twin suns, they would have to be extremely adaptable. The most detailed look yet at the energy from stellar pairs shows there are more potentially habitable worlds in the galaxy than we thought. But the planets' denizens must be able to adapt quickly to wild temperature shifts and unpredictable seasons. Most stars in the galaxy come in pairs or more. Now that view has changed. "This means we cannot dismiss binary stars as being inhospitable," says William Welsh of San Diego State University. Early models assumed the brightest star in a binary pair was the only one that mattered for habitability, and no one modelled systems in which both stars were equally bright. Kane and Caltech colleague Natalie Hinkel modelled a variety of binary systems and calculated the combined light contributions at every point in the stars' vicinity. That creates challenges for land walkers, Kane says. Journal reference: The Astrophysical Journal, doi.org/j36 More from the web

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