Most incredible article about NASA’s Kepler Mission Discovers Bigger, Older Cousin to Earth you'll ever read

NASA's Kepler mission has stated the first shut-Earth-measurement planet in the liveable zone when than citation to a solar-later famous person. This discovery and the graduation of eleven introduced auxiliary little habitable zone candidate planets mark option milestone within the experience to finding alternative Earth.

The newly discovered Kepler-452b is the smallest planet to date found out orbiting within the habitable zone -- the discipline round a celebrity the place liquid water would pool on the skin of an orbiting planet -- of a G2-type star, like our sun. The affirmation of Kepler-452b brings the complete number of validated planets to 1,030.

"On the 20 th anniversary yr of the invention that proved other suns host planets, the Kepler exoplanet explorer has learned a planet and superstar which most closely resemble the Earth and our solar," recounted John Grunsfeld, accomplice administrator of NASA’s Science Mission Directorate at the corporation’s headquarters in Washington. “This exciting results brings us one step within the course of discovering an Earth 2.zero."

Kepler-452b is 60 percent larger in diameter than Earth and is regarded a best-Earth-dimension planet. while its mass and composition are not but decided, prior study suggests that planets the size of Kepler-452b have a simply right risk of being rocky.

while Kepler-452b is larger than Earth, its 385-day orbit is handiest 5 percent longer. The planet is 5 percent farther from its mother or father star Kepler-452 than Earth is from the solar. Kepler-452 is 6 billion years historical, 1.5 billion years older than our sun, has the equal temperature, and is 20 percentage brighter and has a diameter 10 percent better.

“we're competent to believe of Kepler-452b as an older, larger cousin to Earth, supplying an possibility to comprehend and mirror upon Earth’s evolving environment," recounted Jon Jenkins, Kepler data analysis lead at NASA's Ames research center in Moffett discipline, California, who led the crew that found out Kepler-452b. "It’s awe-inspiring to do not forget that this planet has spent 6 billion years inside the liveable zone of its celebrity; longer than Earth. That’s big probability for existence to arise, will have to all the important add-ons and stipulations for lifestyles exist on this planet.”

To support verify the finding and better verify the properties of the Kepler-452 procedure, the workforce carried out floor-centered observations on the school of Texas at Austin's McDonald Observatory, the Fred Lawrence Whipple Observatory on Mt. Hopkins, Arizona, and the W. M. Keck Observatory atop Mauna Kea in Hawaii. These measurements had been key for the researchers to affirm the planetary nature of Kepler-452b, to refine the scale and brightness of its host megastar and to better pin down the size of the planet and its orbit.

The Kepler-452 system is placed 1,400 mild-years away in the constellation Cygnus. The study paper reporting this discovering has been authorised for newsletter within the Astronomical Journal.

in addition to confirming Kepler-452b, the Kepler group has elevated the number of latest exoplanet candidates by using 521 from their analysis of observations conducted from may 2009 to

may 2013, elevating the number of planet candidates detected through the Kepler mission to four,696. Candidates require follow-up observations and analysis to affirm they're genuine planets.

Twelve of the brand new planet candidates have diameters between one to two occasions that of Earth, and orbit in their famous person's liveable zone. of those, nine orbit stars which are similar to our sun in dimension and temperature.

“now we have been competent to entirely automate our procedure of identifying planet candidates, because of this we will eventually investigate each transit sign within the entire Kepler dataset rapidly and uniformly,” mentioned Jeff Coughlin, Kepler scientist at the SETI Institute in Mountain View, California, who led the evaluation of a brand new candidate catalog. “This gives astronomers a statistically sound population of planet candidates to safely assess the number of small, potentially rocky planets like Earth in our Milky approach galaxy.”

These findings, provided in the seventh Kepler Candidate Catalog, will probably be submitted for e-newsletter in the Astrophysical Journal. These findings are derived from knowledge publicly available on the NASA Exoplanet Archive

Scientists now are producing the last catalog situated on the normal Kepler mission’s 4-12 months information set. The final evaluation shall be performed making use of refined program that's more and more sensitive to the tiny telltale signatures of Earth-measurement planets.

Ames manages the Kepler and K2 missions for NASA’s Science Mission Directorate. NASA's Jet Propulsion Laboratory in Pasadena, California, managed Kepler mission progress. Ball Aerospace & applied sciences brand operates the flight process with support from the Laboratory for Atmospheric and subject Physics on the coaching of Colorado in Boulder.

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Remaning part of part 2 of chapter 1

The Copernican model got rid of Ptolemy’s celestial spheres, and with them, the idea that the universe had a
natural boundary. Since “fixed stars” did not appear to change their positions apart from a rotation across the
sky caused by the earth spinning on its axis, it became natural to suppose that the fixed stars were objects like our sun but very much farther away. Newton realized that, according to his theory of gravity, the stars should attract each other, so it seemed they could not remain essentially motionless. Would they not all fall together at some point? In a letter in 1691 to Richard Bentley, another leading thinker of his day, Newton argued that this would indeed happen if there were only a finite number of stars distributed over a finite region of space. But he reasoned that if, on the other hand,there were an infinite number of stars, distributed more or less uniformly over infinite space, this would nothappen, because there would not be any central point for them to fall to.


This argument is an instance of the pitfalls that you can encounter in talking about infinity. In an infinite
universe, every point can be regarded as the center, because every point has an infinite number of stars on
each side of it. The correct approach, it was realized only much later, is to consider the finite situation, in which the stars all fall in on each other, and then to ask how things change if one adds more stars roughly uniformly distributed outside this region. According to Newton’s law, the extra stars would make no difference at all to the original ones on average, so the stars would fall in just as fast. We can add as many stars as we like, but they will still always collapse in on themselves. We now know it is impossible to have an infinite static model of the universe in which gravity is always attractive.

To be cont.......

part 2 of chapter 1

I welcome you once again let guys and girls see that what next given by Stephen Hawking in Brief History of Time



The planets themselves moved on smaller circles attached to their respective spheres in order to account for
their rather complicated observed paths in the sky. The outermost sphere carried the so-called fixed stars,
which always stay in the same positions relative to each other but which rotate together across the sky. What
lay beyond the last sphere was never made very clear, but it certainly was not part of mankind’s observable
universe. Ptolemy’s model provided a reasonably accurate system for predicting the positions of heavenly bodies in thesky. But in order to predict these positions correctly, Ptolemy had to make an assumption that the moon followed a path that sometimes brought it twice as close to the earth as at other times. And that meant that the moon ought sometimes to appear twice as big as at other times! Ptolemy recognized this flaw, but nevertheless his model was generally, although not universally, accepted. It was adopted by the Christian church as the picture of the universe that was in accordance with Scripture, for it had the great advantage that it left lots of room outside the sphere of fixed stars for heaven and hell.
A simpler model, however, was proposed in 1514 by a Polish priest, Nicholas Copernicus. (At first, perhaps for fear of being branded a heretic by his church, Copernicus circulated his model anonymously.) His idea was that the sun was stationary at the center and that the earth and the planets moved in circular orbits around the sun. Nearly a century passed before this idea was taken seriously. Then two astronomers – the German, Johannes Kepler, and the Italian, Galileo Galilei – started publicly to support the Copernican theory, despite the fact that the orbits it predicted did not quite match the ones observed. The death blow to the Aristotelian/Ptolemaic theory came in 1609. In that year, Galileo started observing the night sky with a telescope, which had just beeni nvented. When he looked at the planet Jupiter, Galileo found that it was accompanied by several small satellites or moons that orbited around it. This implied that everything did not have to orbit directly around the earth, as Aristotle and Ptolemy had thought. (It was, of course, still possible to believe that the earth was stationary at the center of the universe and that the moons of Jupiter moved on extremely complicated paths around the earth, giving the appearance that they orbited Jupiter. However, Copernicus’s theory was much simpler.) At the same time, Johannes Kepler had modified Copernicus’s theory, suggesting that the planets moved not in circles but in ellipses (an ellipse is an elongated circle). The predictions now finally matched the observations.

As far as Kepler was concerned, elliptical orbits were merely an ad hoc hypothesis, and a rather repugnant one at that, because ellipses were clearly less perfect than circles. Having discovered almost by accident that
elliptical orbits fit the observations well, he could not reconcile them with his idea that the planets were made to orbit the sun by magnetic forces. An explanation was provided only much later, in 1687, when Sir Isaac Newton published his Philosophiae Naturalis Principia Mathematica, probably the most important single work ever published in the physical sciences. In it Newton not only put forward a theory of how bodies move in space and time, but he also developed the complicated mathematics needed to analyze those motions. In addition, Newton postulated a law of universal gravitation according to which each body in the universe was attracted toward every other body by a force that was stronger the more massive the bodies and the closer they were to each other. It was this same force that caused objects to fall to the ground. (The story that Newton was inspired by an apple hitting his head is almost certainly apocryphal. All Newton himself ever said was that the idea of gravity came to him as he sat “in a contemplative mood” and “was occasioned by the fall of an apple.”) Newton went on to show that, according to his law, gravity causes the moon to move in an elliptical orbit around the earth and causes the earth and the planets to follow elliptical paths around the sun.



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part 1 of chapter 1

fig 1.

Now I am going to write some thing about stephen Hawking theory. These are so long so I write them in parts like chapter. So don't miss that and read them it is precious treasure for you.

A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: “What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.” The scientist gave a superior smile before replying, “What is the tortoise standing on.” “You’re very clever, young man, very clever,” said the old lady. “But it’s turtles all the way down!”

Most people would find the picture of our universe as an infinite tower of tortoises rather ridiculous, but why dowe think we know better? What do we know about the universe, and how do we know it? Where did theuniverse come from, and where is it going? Did the universe have a beginning, and if so, what happened beforethen? What is the nature of time? Will it ever come to an end? Can we go back in time? Recent breakthroughsin physics, made possible in part by fantastic new technologies, suggest answers to some of theselongstanding questions. Someday these answers may seem as obvious to us as the earth orbiting the sun – or

perhaps as ridiculous as a tower of tortoises. Only time (whatever that may be) will tell.

As long ago as 340 BC the Greek philosopher Aristotle, in his book On the Heavens, was able to put forward

two good arguments for believing that the earth was a round sphere rather than a Hat plate. First, he realized that eclipses of the moon were caused by the earth coming between the sun and the moon. The earth’s shadow on the moon was always round, which would be true only if the earth was spherical. If the earth had been a flat disk, the shadow would have been elongated and elliptical, unless the eclipse always occurred at a time when the sun was directly under the center of the disk. Second, the Greeks knew from their travels that the North Star appeared lower in the sky when viewed in the south than it did in more northerly regions. (Since

the North Star lies over the North Pole, it appears to be directly above an observer at the North Pole, but tosomeone looking from the equator, it appears to lie just at the horizon. From the difference in the apparent position of the North Star in Egypt and Greece, Aristotle even quoted an estimate that the distance around the earth was 400,000 stadia. It is not known exactly what length a stadium was, but it may have been about 200 yards, which would make Aristotle’s estimate about twice the currently accepted figure. The Greeks even had a third argument that the earth must be round, for why else does one first see the sails of a ship coming over the horizon, and only later see the hull?

Aristotle thought the earth was stationary and that the sun, the moon, the planets, and the stars moved in circular orbits about the earth. He believed this because he felt, for mystical reasons, that the earth was the center of the universe, and that circular motion was the most perfect. This idea was elaborated by Ptolemy in

the second century AD into a complete cosmological model. The earth stood at the center, surrounded by eight

spheres that carried the moon, the sun, the stars, and the five planets known at the time, Mercury, Venus,

Mars, Jupiter, and Saturn.

see fig. 1

to be cont.......