PHOBOS PDF, EPUB, EBOOK Eddie Robson, Paul McGann, Sheridan Smith | none | 30 May 2007 | Big Finish Productions Ltd | 9781844352593 | English | Maidenhead, United Kingdom Phobos on Steam There is certainly evidence that Phobos has suffered the occasional asteroid impact. Given that Phobos is so small, there is another potential source for impact debris on its surface. Such debris might actually be flung at Phobos from the surface of Mars, as the Red Planet is hit by asteroids from time to time. Some computations suggest about parts per million — or even more — of the unconsolidated rock debris on Phobos's surface came from Mars. Alternatively, the Phobos monolith might not have formed during an impact. It could be a rare chunk of the moon's solid bedrock, poking up through a surface that is otherwise mostly strewn with loose debris. This is an idea that was discussed several years ago by planetary scientists exploring the possibility of a mission to Phobos. If this hypothesis is true, it would mean the monolith could hold clues about the origins of Phobos itself. And that would make the monolith a surprisingly big deal. According to some planetary science, Phobos is just about the most mysterious body in the known Solar System. Phobos is one of two tiny moons orbiting Mars, the other being Deimos. It is not really clear how they got there. Both are small and irregular in shape, which makes them look a little like asteroids that fell into Mars's gravitational clutches long ago. But the moons orbit Mars in a way that is incompatible with this "snatched asteroid" idea. Eventually, the large moon and all but two of the small moons orbited so close to Mars that they disintegrated. An alternative is that they formed from the same material that Mars did when the planet coalesced billions of years ago. However, precise astronomical measurements reveal that Phobos has a much lower density than typical Martian rock. That leaves a third idea: Mars suffered a devastating impact with a large protoplanet long ago, which generated the two moons. A similar sort of collision is thought to be behind the creation of Earth's Moon. But our Moon is large, and Phobos and Deimos are tiny. A massive impact should have given Mars a much larger satellite. They both conclude that the third idea is correct. While one adds further evidence that the moons are not captured asteroids , the second sets out a detailed scenario that can explain how Mars ended up with two tiny moons. The massive impact did, apparently, generate a large moon. It was this large moon that encouraged the formation of Phobos and Deimos, and several other satellites, from the leftover debris. Eventually, the large moon and all but two of the small moons orbited so close to Mars that they disintegrated and returned to the Martian surface. Phobos and Deimos alone survive. Proposed expeditions to analyse the composition of Phobos , and its monolith, could test this idea. But the clock is ticking. By continuing to use the site you are agreeing to our use of cookies. OK Find out more about our cookie policy. Toggle navigation Toggle navigation. Toggle mission navigation. Missions Show All Missions. Asset Publisher Martian moons: Phobos. Martian moons: Phobos. Video is not supported. Images And Videos. Images And Videos Deimos. Mars- facing side of Phobos. Close-up of Phobos, acquired on 28 July Phobos and Deimos. Pioneering images of both Martian moons. Orbits of Mars Express and the Martian moons. Phobos Related Publications. Rosenblatt, P. Related Publications Rosenblatt, P. Related Links. See Also. Mars Express to make closest ever approach to Phobos. See Also Mars Express to make closest ever approach to Phobos. All rights reserved. Terms and Conditions. An image of the Mars-facing side of Phobos. Key parameters for Phobos. phobos - Перевод на русский - примеры английский | Reverso Context Measurements of the day and night sides of Phobos show such extreme temperature variations that the sunlit side of the moon rivals a pleasant winter day in Chicago, while only a few kilometers away, on the dark side of the moon, the climate is more harsh than a night in Antarctica. High temperatures for Phobos were measured at 25 degrees Fahrenheit -4 degrees Celsius and lows at degrees Fahrenheit degrees Celsius. This intense heat loss is likely a result of the fine dust on Phobos' surface, which is unable to retain heat. Phobos has no atmosphere. It may be a captured asteroid, but some scientists show evidence that contradicts this theory. Hall named Mars' moons for the mythological sons of Ares, the Greek counterpart of the Roman god, Mars. Phobos, whose name means fear is the brother of Deimos. Overview Phobos, gouged and nearly shattered by a giant impact crater and beaten by thousands of meteorite impacts, is on a collision course with Mars. A 3D model of Phobos, on of two moons of Mars. In Depth. The symbols, mottos, and small objects added to the agency's newest Mars rover serve a variety of purposes, from functional to decorative. NASA's Perseverance rover carries a device to convert Martian air into oxygen that one day could be used not just for breathing, but also for fuel. The first rover to be rigged with microphones, Perseverance picked up sounds of its inner workings during flight. Plumes of water vapor that may be venting into space from Jupiter's moon Europa could come from within the icy crust itself, according to new research. This latest is from a location named "Mary Anning," after a 19th-century English paleontologist. Mark your calendars: NASA's latest rover has only about days to go before it touches down on the Red Planet, becoming history's next Mars car. New experiments re-create the environment of Europa and find that the icy moon shines, even on its nightside. The effect is more than just a cool visual. The next full Moon will be on the morning of Halloween, Saturday, Oct. Perseverance has about million miles million kilometers left to reach its destination. This illustration shows Jezero Crater — the landing site of the Mars Perseverance rover — as it may have looked billions of years ago. Remarkable linear grooves, typically metres feet wide and 20 metres 65 feet deep, cover much of the surface. There is strong evidence that they are associated with the formation of the largest crater on Phobos. This structure, known as Stickney , measures about 10 km 6 miles across. If such is the case, it will collide with Mars in the very distant future. Phobos Article Media Additional Info. Home Science Astronomy. Print Cite. Facebook Twitter. Give Feedback External Websites. Let us know if you have suggestions to improve this article requires login. External Websites. NASA - Phobos. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History. Video of Phobos's rotation as assembled from still photographs taken by the European Space Agency's Mars Express orbiter. Britannica Quiz. But how much do you know about the moons of other planets? BBC - Earth - There is a huge 'monolith' on Phobos, one of Mars's moons Science News. An image taken on February 25, , shows Phobos while in eclipse, where Mars' shadow completely blocked sunlight from reaching the moon's surface. This event resulted in some of the coldest temperatures measured on Phobos to date, with the coldest being about degrees Fahrenheit degrees Celsius. On March 27, , Phobos was observed exiting an eclipse, when its surface was still warming up. Related Multimedia : Images capture the Mars moon Phobos during different phases -- waxing, waning and full. ScienceDaily, 3 June Northern Arizona University. Origin of Martian moon Phobos. Retrieved December 14, from www. This dark aspect inspired the hypothesis that the close- orbiting moon may be a captured asteroid, but its Who put that there? These are the words of Buzz Aldrin, the second man to walk on the Moon, in He was talking about a peculiar and solitary large rock, a monolith, that sits on the surface of the Martian moon Phobos. Aldrin was right: many people are vexed by the Phobos monolith. It has inspired all manner of alien-based conspiracy theories and this fascinating discussion on Reddit. The monolith appears to be a large boulder, variously described as building-sized or 90m tall. It stands in a desolate, featureless region of Phobos, which probably makes the monolith seem even more impressive. Other spooky features, like the infamous face on Mars, do not seem quite so unusual when you take a closer look. It is not alone. Mars boasts a monolith of its own. However, the scientific community does not see such monoliths as evidence of advanced alien civilisations. The Martian monolith is almost certainly no more than a roughly straight-edged chunk of rock that tumbled down from a nearby cliff. Perfectly natural erosional forces can also explain why Mars seems to be home to a levitating spoon and an Egyptian-style pyramid. Other spooky features, like the infamous face on Mars , do not seem quite so unusual when you take a closer look or view them from a different angle. It is possibly simply a shard formed during an impact event. There is certainly evidence that Phobos has suffered the occasional asteroid impact. Given that Phobos is so small, there is another potential source for impact debris on its surface. Such debris might actually be flung at Phobos from the surface of Mars, as the Red Planet is hit by asteroids from time to time.