Learn English with English, baby!

Join for FREE!

Social_nav_masthead_logged_in

English Forums

Use our English forums to learn English. The message boards are great for English questions and English answers. The more you contribute, the more all members can practice English!

:  

Life Talk!

do u believe in GOD?

funny_shadow

Morocco

in islam we believe in one GOD, ALLAH!!

12:59 AM Sep 20 2007 |

The iTEP® test

  • Schedule an iTEP® test and take the official English Practice Test.

    Take Now >

sousou88

sousou88

Algeria

yes of course I believe in GOD HE is ALLAH . WHO made us and we adore HIM and we dedicate to HIM all what we do .all praise to ALLAH because guided us and show to us the straight way  .OH my GOD guide all people who want to know you and who want to show the straight way .

07:28 PM May 12 2008 |

birgül1

Turkey

of course,the basement is fairly good place for one who want to bronze!!!!!!!!!Smile

07:57 PM May 12 2008 |

birgül1

Turkey

hi Dev.

you are like a ghost.you are sometimes here,sometimes absent.Smile

how is your relation between you and god recently.

08:02 PM May 12 2008 |

hekmer

hekmer

Saudi Arabia

OFFTHEWALL, DO NOT BE AS FOOL, MY FRIEND

 I MEAN KEEP YOUR LAST IDEA FOR YOUR SELF, I DON'T NEED ITYOU DESERVE IT NOT ME

AND IF YOU WANT TO TELL ME ABOUT ANY SOMEBODY LIKE ME AS EXAMPLE, DO NOT DO THAT…, ONLY TELL ME ABOUT YOURSELF ONLY IF YOU WANT

SALAMBABI

05:44 PM May 13 2008 |

birgül1

Turkey

http://www.allahexists.com/

American scientists have discovered the furthest planet from the Solar System, of which our Earth is a part. According to a report on the Internet space site, the planet, the same size as Jupiter, revolves in a narrow orbit around a star 5,000 light years away from the Milky Way. The scientists stated that the planet revolves around the star in as little as 29 hours, and recorded that its surface is very hot, several thousand degrees. Astronomers at the Harvard Smithsonian Center located the star as the result of minute variations emitted by the star around which it revolves. The astronomers revealed that the planet passed in front of the star every 29 hours, during which times there was a reduction in the amount of light emitted by the star. The variation in that light, they announced, was the equivalent of a mosquito passing in front of the headlight of a car 186 miles away. Astronomers have also so far determined more than 100 stars outside the Solar System by this method.

The above scientific discovery indicates a very important truth; the magnificent size of the universe!

Bearing in mind that light travels at approximately 186 411 mps, the distance it travels in 5,000 light years is beyond human comprehension. In addition, that distance is only very small in proportion to the size of the universe, within the Solar System of which we are a part.

Even more astounding dimensions emerge when we consider the size of the universe.

Let us now continue this examination in order to understand the size of the universe… The planet Earth is a part of the solar system. In this system there are nine major planets with fifty-four satellites, and an uncounted number of asteroids all revolving around a single star called "Sun", a middle-sized star compared with others in the universe. Earth is the third planet from the sun.

The diameter of the sun is 103 times that of the earth. To visualize this, the planet Earth has diameter of 7581 miles. If we scaled that down to the dimensions of a glass ball, the sun would be about the size of soccer ball. But the interesting thing is the distance between the two. Keeping to the same scale, the two balls should be 919 feet apart. Some of the objects representing the outer planets would have to be set several kilometers away.

Big though this might seem, the solar system is a quite miniscule in size compared with the Milky Way, the galaxy in which it is located. There are over 250 billion stars in the Milky Way-some similar to the sun, others bigger, others smaller. The star nearest to the sun is Alpha Centauri. If we wanted to add Alpha Centauri in our model system, it would have to be located 484, 669 miles away.

That's too big for almost anyone to grasp, so let's reduce the scale. We'll assume the earth to be as big as a dust-particle. That would make the sun as big as a walnut about three meters from the earth. On this scale, Alpha Centauri would have to be located 398 miles from the sun.

The Milky Way consists of about 250 billion stars with similarly mind-boggling distances between them. The sun is located closer to the edge of this spiral-shaped galaxy than it is to the justify.

Even the Milky Way is dwarfed by the vast size of the whole universe. It is just one of many galaxies-nearly 300 billion of them according to recent calculations. And the distances between galaxies are millions of times greater than that between the sun and Alpha Centauri.

George Greenstein, in The Symbiotic Universe, comments on this unimaginable vastness:

Had the stars been somewhat closer, astrophysics would not have been so very different. The fundamental physical processes occurring within stars, nebulas, and the like would have proceeded unchanged. The appearance of our galaxy as seen from some far-distant vantage point would have been the same. About the only difference would have been the view of the night time sky from the grass on which I lie, which would have been yet richer with stars. And oh, yes-one more small change: There would have been no me to do the viewing…All that waster space! On the other hand, in this very waste lies our safety. (George Greenstein, The Symbiotic Universe, p. 21)

Greenstein also explains the reason for this. In his view, the huge distances in space makes it possible for certain physical variables to be arranged so as to be exactly suitable for human life. He also notes the importance of this huge space in allowing Earth to exist while minimizing the risk of collision with other stars. (For more details, see Harun Yahya's The Creation of the Universe, Al-Attique Publishers Inc., Canada: 2000)

Doubtlessly, the design of the universe is evidence of God's power to establish. The precise balances and all the human beings and other creatures are the evidence of God's supreme power and act of creation. This result discovered by modern science is just a reworking of a truth revealed fourteen centuries ago in the Qur'an:

Your Lord is God, Who created the heavens and the Earth in six days and then settled Himself firmly on the Throne. He covers the day with the night and, each pursuing the other urgently; and the Sun and Moon and stars are subservient to His command. Both creation and command belong to Him. Blessed be God, the Lord of all worlds. (Qur'an, 7:54

09:04 PM May 13 2008 |

gkisseberth

Germany

Bearing in mind that light travels at approximately 186 411 mps, the distance it travels in 5,000 light years is beyond human comprehension.

 

a light-year is not a measurement of time, so light cannot travel some distance in 5.000 light-years.

 

I wonder if the author of this piece learned about astronomy from George Lucas.  

09:53 PM May 13 2008 |

birgül1

Turkey

Light-yearFrom Wikipedia, the free encyclopedia• Ten things you may not know about Wikipedia •Jump to: navigation, search<!- start content ->For other uses, see Light year (disambiguation).1 light-year =SI units9.4607×1012 km9.4607×1015 mAstronomical units63.241×103 AU0.3066 pcUS customary / Imperial units5.8786×1012 mi31.039×1015 ft

A light-year or light year (symbol: ly) is a unit of measurement of length. As defined by the International Astronomical Union (which is the body which has the jurisdictional authority to promulgate the definition), a light year is the distance that light travels in a vacuum in one Julian year.[1]

Contents[hide]

[edit] Numerical value

A light-year is equal to:

The figures above are based on a Julian year (not Gregorian year) of exactly 365.25 days (each of exactly 86,400 SI seconds, totalling 31,557,600 seconds) as defined by the IAU[2].

The light-year is often used to measure distances to stars. In astronomy, the preferred unit of measurement for such distances is the parsec, which is defined as the distance at which an object will appear to move one arcsecond of parallax when the observer moves one astronomical unit perpendicular to the line of sight to the observer. This is equal to approximately 3.26 light-years. The parsec is preferred because it can be more easily derived from, and compared with, observational data. However, outside scientific circles, the term light-year is more widely used.

[edit] Definitions on the web

Internet search engines base their light-years on the 1900.0 mean tropical year, specified in the definition of the ephemeris second as 31,556,925.9747 s[3] (12 significant digits), but round the number of metres to fewer significant digits. Microsoft's Live Search rounds to ten digits, Google and AOL round to eight digits, Ask.com rounds to seven digits, while Yahoo rounds to only five digits. All of these are smaller than the IAU definition.

[edit] Distances in light-years

Distances measured in fractions of a light-year usually involve objects within a star system. Distances measured in light-years include distances between nearby stars, such as those in the same spiral arm or globular cluster.

One kilolight-year, abbreviated "kly", is one thousand light-years, or about 307 parsecs. Kilolight-years are typically used to measure distances between parts of a galaxy.

One megalight-year, abbreviated "Mly", is one million light-years, or about 306,600 parsecs. Megalight-years are typically used to measure distances between neighboring galaxies and galaxy clusters.

One gigalight-year, abbreviation "Gly", is one billion light-years — one of the largest distance measures used. One gigalight-year is about 306.6 million parsecs. Gigalight-years are typically used to measure distances to supergalactic structures, including quasars and the Great Wall.

List of orders of magnitude for lengthFactor (ly)ValueItem10-940.4×10-9 lyReflected sunlight from the Moon's surface takes 1.2-1.3 seconds to travel the distance to the Earth's surface. (The surface of the moon is roughly 376300 kilometers from the surface of the Earth, on average. 376300 km ÷ 300000 km/s (roughly the speed of light) ≈ 1.25 seconds)10-615.8×10-6 lyOne astronomical unit (the distance from the Sun to the Earth). It takes approximately 499 seconds (8.32 minutes) for light to travel this distance.[4]10-33.2×10-3 lyThe most distant space probe, Voyager 1, was about 14 light-hours away from Earth in the week ending March 9, 2007. It took that space probe 30 years to cover that distance.[5]1002×100 lyThe Oort cloud is approximately two light-years in diameter. Its inner boundary is speculated to be at 50,000 AU, with its outer edge at 100,000 AU1.8×100 lyMaximum extent of the Sun's gravitational pull (hill sphere/roche sphere, 125,000 AU). Beyond this is true interstellar space4.21×100 lyThe nearest known star (other than the Sun), Proxima Centauri, is about 4.22 light-years away.[6] [7]10326×103 lyThe center of our galaxy, the Milky Way, is about 8 kiloparsecs away.[8] [9]100×103 lyThe Milky Way is about 100,000 light-years across.1062.5×106 lyThe Andromeda Galaxy is approximately 2.5 megalight-years away.3.14×106 lyThe Triangulum Galaxy (M33), at 3.14 megalight-years away, is the most distant object visible to the naked eye.59×106 lyThe nearest large galaxy cluster, the Virgo Cluster, is about 59 megalight-years away.150×106 – 250×106 lyThe Great Attractor lies at a distance of somewhere between 150 and 250 megalight-years (the latter being the most recent estimate).1091.2×109 lyThe Sloan Great Wall (not to be confused with the Great Wall) has been measured to be approximately one gigalight-year distant.46.5×109 lyThe comoving distance from the Earth to the edge of the visible universe is about 46.5 gigalight-years in any direction; this is the comoving radius of the observable universe. This is larger than the age of the universe dictated by the cosmic background radiation.

[edit] References

The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c.[1] It is the speed of all electromagnetic radiation, including visible light, in free space. It is the speed of anything having zero rest mass.[2] In SI units, the speed of light in vacuum is defined to be exactly 299,792,458 metres per second (1,079,252,849 km/h).[3] The speed of light can be assigned a definite numerical value because the fundamental SI unit of length, the metre, has been defined since October 21, 1983, as the distance light travels in a vacuum in 1/299,792,458 of a second; in other words, any increase in the measurement precision of the speed of light would refine the definition of the metre, but not alter the numerical value of c. The approximate value of 3×108 m/s is commonly used in rough estimates (the error is 0.07%). In imperial units, the speed of light is about 670,616,629.4 miles per hour or 983,571,056.4 feet per second (roughly one foot per nanosecond), which is about 186,282.397 miles per second.

11:05 PM May 13 2008 |

birgül1

Turkey

of course light travels,gkiss.

this is the one of the basic rules in science,as you know.

it travels 299,792,458meters in 1 second.

I cant remember exactly but I remember that the light of the sun arrives to the earth in 3-4 minutes.

11:11 PM May 13 2008 |

gkisseberth

Germany

Well, very good information for people who didn't know what a light-year is. 

 

My point was that the author of the article you pasted used the term as a measurement of time, not distance.

 

It would be like asking "how far can a cheetah run in 400 yards?"

 

If the author doesn't even understand a simple thing like that, why should we put any stock in whatever else they are saying? 

 

 

02:09 AM May 14 2008 |

ratham

China

Whether you believe it or not, do what you should do.

06:31 AM May 14 2008 |