As a terrestrial planet, Earth is located within the Inner Solar System between between Venus and Mars which are also terrestrial planets. But the most remarkable thing about our planet is its diversity. Not only are there an endless array of plants, animals, avians, insects and mammals, but they exist in every terrestrial environment. So how exactly did Earth come to be the fertile, life-giving place we all know and love? Size, Mass, and Orbit: With a mean radius of km and a mass of 5. And with a mean density of 5. In terms of its orbit, Earth has a very minor eccentricity approx. This works out to an average distance aka. Wikipedia Commons The Earth has an orbital period of
Determining the age of surfaces on Mars
Early history[ edit ] In Ancient Greece , Aristotle BCE observed that fossils of seashells in rocks resembled those found on beaches — he inferred that the fossils in rocks were formed by living animals, and he reasoned that the positions of land and sea had changed over long periods of time. Leonardo da Vinci — concurred with Aristotle’s interpretation that fossils represented the remains of ancient life.
Steno argued that rock layers or strata were laid down in succession, and that each represents a “slice” of time.
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February 27, By dating the rocks in the ever-changing crust, as well as neighbors such as the moon and visiting meteorites, scientists have calculated that Earth is 4. How old are your rocks? Several attempts to scientifically date the planet have occurred over the past years. Scientists attempted to predict the age based on changing sea levels, the time it took for Earth or the sun to cool to present temperatures, and the salinity of the ocean. As science progressed, these methods were proven to be unreliable; for instance, the rise and fall of the ocean was shown to be an ever-changing process rather than a gradually declining one.
In an effort to calculate the age of the planet, scientists turned to the rocks that cover its surface.
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Reference to a case where the given method did not work This is perhaps the most common objection of all. Creationists point to instances where a given method produced a result that is clearly wrong, and then argue that therefore all such dates may be ignored. Such an argument fails on two counts: First, an instance where a method fails to work does not imply that it does not ever work.
The question is not whether there are “undatable” objects, but rather whether or not all objects cannot be dated by a given method. The fact that one wristwatch has failed to keep time properly cannot be used as a justification for discarding all watches.
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The strange object was spotted in images beamed back to Earth by Nasa’s Curiosity Rover, which has been trundling around on Mars since YouTube alien hunter Paranormal Crucible spotted what they claim is an alien skull lying on the surface of Mars. It is a form of apophenia, when people see patterns in random, unconnected data.
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Scientists find link between comet and asteroid showers and mass extinctions October 20, Mass extinctions occurring over the past million years were likely caused by comet and asteroid showers, scientists conclude in a new study published in Monthly Notices of the Royal Astronomical Society. Claims about new planets that turned out to be wrong—and why ‘Planet Nine’ may be different January 25, There’s a real buzz among planetary scientists after a new study suggested that an unseen planet, dubbed “Planet Nine”, of about ten times the Earth’s mass could be lurking in the Kuiper belt, a band of icy objects beyond Brown of Caltech announced that they had found evidence that hinted at the existence of a massive planet at the edge of the Solar System.
Giant comets may threaten Earth: Search narrows for Planet Nine February 23, US astronomers announced last month they may have found a ninth planet beyond Neptune, but conceded they had no idea where on an estimated 10, , year orbit it might be. Recommended for you A new ‘atmospheric disequilibrium’ could help detect life on other planets January 24, As NASA’s James Webb Space Telescope and other new giant telescopes come online they will need novel strategies to look for evidence of life on other planets.
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At the time that Darwin’s On the Origin of Species was published, the earth was “scientifically” determined to be million years old. By , it was found to be 1. In , science firmly established that the earth was 3. Finally in , it was discovered that the earth is “really” 4.
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Humans first witnessed Earth as a complete orb floating in the inky blackness of space in December when Apollo 8 carried astronauts around the Moon. Robotic space probes on their way to destinations beyond Earth, such as the Galileo and the Near Earth Asteroid Rendezvous NEAR spacecraft in the s, also looked back with their cameras to provide other unique portraits of the planet. Viewed from another planet in the solar system, Earth would appear bright and bluish in colour. Easiest to see through a large telescope would be its atmospheric features, chiefly the swirling white cloud patterns of midlatitude and tropical storms , ranged in roughly latitudinal belts around the planet.
The polar regions also would appear a brilliant white, because of the clouds above and the snow and ice below. Beneath the changing patterns of clouds would appear the much darker blue-black oceans, interrupted by occasional tawny patches of desert lands. The green landscapes that harbour most human life would not be easily seen from space. Over the course of the seasons, some changes in the storm patterns and cloud belts on Earth would be observed.
Also prominent would be the growth and recession of the winter snowcap across land areas of the Northern Hemisphere. Scientists have applied the full battery of modern instrumentation to studying Earth in ways that have not yet been possible for the other planets; thus, much more is known about its structure and composition.
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It is simply the habit of calling Earth “Terra” in Sci Fi. The word is adopted from the Latin word for, well, earth. It is used to make the planet Earth follow the Roman naming systems for the planets of the Solar System and also as a more respectable description for the inhabitants of the planet rather than ” Earthling “. Latin-derived languages with less speakers. And it provides a convenient standardisation in that Earth is otherwise the only planet in the Solar system that is not named for a Roman deity.
This is often accompanied by reference to Earth’s sun as “Sol”, and the moon as “Luna”, to differentiate them from other suns or moons.
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Date set for Planet Rock and Absolute 80s move. A looped message will replace full programming on D1 from 6pm Monday 18th April informing listeners of the change. The move has not gone un-noticed by over people who have joined in a petition to keep the stations available in more places. A page on the Planet Rock website advising listeners to retune has no mention of the drop in coverage the station will have after the move. In justifying the move, Digital One says research shows listeners to radio are increasingly consuming brands over a range of platforms.
In the multiplex change request, D1 said:
Planet Rock is the UK’s number 1 rock radio station. We play the best music of the past 40 years from Zeppelin to the Foo Fighters; from Sabbath to Muse. Views: K.
The companion planet is small, at less than 40, miles wide — about five times the diameter of Earth. But it is so close to the pulsar that if it were any bigger it would be ripped apart by the gravitational force of the star, which rotates more than 10, times per minute and has a mass of about 1. The international research team found the diamond planet in our Milky Way above after first detecting an unusual star, called a pulsar.
They think the planet is all that remains of the original star, most of whose matter was siphoned off towards the pulsar Research team member Dr Michael Keith said: The pulsar, dubbed PSR J , and its planet are part of the Milky Way’s plane of stars and lie 4, light-years away in the constellation of Serpens – the Snake. The modulations in the radio pulses told astronomers a number of things about the planet. It orbits the pulsar in just two hours and ten minutes, and the distance between the two objects is about , miles – a little less than the radius of our sun.
Despite its small size, the planet has slightly more mass than Jupiter. About 70 per cent of millisecond pulsars have companions of some kind. Astronomers think it is the companion that, in its star form, transforms an old, dead pulsar into a millisecond pulsar by transferring matter and spinning it up to a very high speed. The result is a fast-spinning millisecond pulsar with a shrunken companion – most often a so-called white dwarf.
The find is reported in the journal Science. Share or comment on this article: Is this the biggest rock ever?
How Old is Earth?
Determining the age of surfaces on Mars Mike Caplinger, Malin Space Science Systems February A fundamental problem in planetary science is determining how the surface of a planet has changed over time. This tells us something about the dynamics of planetary interiors for example, how often volcanoes erupt or how often earthquakes occur and also something about the processes that affect planets from without for example, how likely it is that a giant asteroid might hit the Earth and change it radically.
The simplest way of describing how a surface has changed over time is to describe the age of each part of that surface.
Although they also posed new questions, the thousands of satellite photographs brought back from the Moon have permitted us to map its surface with greater accuracy than Earth could be mapped a few decades ago. We now have over kg of rocks from nine places on the Moon, rocks that have been analyzed by hundreds of scientists from many different countries.
Data from a variety of experiments have revealed much about the Moon’s deep interior. As it turns out, the Moon is truly a whole new world, with rocks and surface features that provide a record of events that occurred during the first billion years of the solar system. This record is not preserved on Earth because all rocks formed during the first million years of Earth’s history were recycled back into the interior.
The importance of the Moon in studying the principles of geology is that it provides an insight into the basic mechanics of planetary evolution and events that occurred early in the solar system. Much of the knowledge we have of how planets are born and of the events that transpired during the early part of their histories has been gained from studies of the Moon. At the outset, it is important to note that we assume that the physical and chemical laws that govern nature are constant.
For example, we use observations about how chemical reactions occur today, such as the combination of oxygen and hydrogen at specific temperatures and pressures to produce water, and infer that similar conditions produced the same results in the past. This is the basic assumption of all sciences. Moreover, much of what we “know” about the planets, as in all science, is a mixture of observation and theory a mixture that is always subject to change.