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An astronomy telescope is a scope that allows individuals to see the planets and stars in greater clarity than they can see them with the naked eye. It is not only fun to do, but it can be an activity that both adults and children can share in interest and enjoyment. But, how do you know which telescope to buy? There are so many different kinds, sizes, magnifications, and prices that it can be very intimidating to purchase your first astronomy telescope without some information and education first. Here are some basic guidelines that you can follow when making your choice:

Reflective, Refractive, or Compound? These terms refer to the types of lenses and the way that the images are collected. A reflective scope uses mirrors to collect light and focus the images while a refractive uses curved glass lenses, and the compound astronomy telescope uses a combination of the two.

The cost of a reflective telescope makes it an attractive choice. Mirrors are inexpensive and easy to replace. It is also good for deep space viewing. The disadvantage is that it the mirrors sometimes do not provide the clarity of the refractive scope and sometimes the mirrors are jostled loose.

The refractive astronomy telescope is good for viewing planets and stars. It has very clear images and is easy to maintain. The cost is the main prohibitive factor to most beginning astronomers.

The compound telescope is also on the pricier end of the astronomy telescope family. It is used most often by serious astronomers and those who make a career of astronomy because of the clarity of images and the ability to see images in deep space. This is probably not the best choice for novice star-watchers.

One of the main considerations that you should think about when you are purchasing an astronomy telescope is the aperture. This is a measurement of the ability of the telescope to let light in and also the ability to focus that light. This is a more important measure of the telescope?s abilities than the magnification. The bigger the aperture, the better the telescope will be.

Another important consideration is mounting and portability. If you are going to be moving your astronomy telescope from place to place or taking hiking or camping, you will want a smaller scope with an easy to manage mount. The alt-azimuth mount allows the astronomy telescope to move up and down vertically and side to side horizontally from a central axis-this is perfect for beginners. A more advanced astronomy telescope user might like an equatorial mount which not only allows vertical and horizontal movement, but also sliding from side to side on a perpendicular mount to follow the movement of stars and planets.

As you research your choices you will find a lot more information which can be helpful in deciding the best telescope for you and your family.

1. Formulas - Orbits - Kepler and Newton

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2. SF Reviews Brute Orbits by George Zebrowski

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3. Moon Phase Prediction Software & eBook.

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4. The Space Place :: Shoot a Cannonball into Orbit!

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5. The Geometry of Orbits: Ellipses, Parabolas, and Hyperbolas

The Geometry of Orbits: Ellipses, Parabolas, and Hyperbolas Orbits may have three distinct shapes Ellipses Closed orbits that have a period: eccentricity = 0 to 0.9999999. These are the most common ...
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7. Catalogue Of Cometary Orbits

Catalogue Of Cometary Orbits Smithsonian Astrophysical Observatory The availability of the 16th edition of the Catalogue of Cometary Orbits was announced on IAUC 8604 issued on 2005 Sept. 28. The 207 ...
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8. Session 7. Planets: Orbits and Tides

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10. Planet Orbits & Zone of Habitability

Planet Orbits & Zone of Habitability Zone of Habitability The orbits of planets could potentially help determine if life can develop and survive on a planet. For example, if a planet circles a star ...
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11. MSN Encarta - Multimedia - Elements of Orbits

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12. SPACE.com -- Last Titan Rocket Successfully Orbits Reconnaissance Satellite

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13. PlanetBlog » Blog Archive » A star orbits a black hole (video)

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16. Planet Orbits ScreenSaver

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17. Dictionary of Technical Terms for Aerospace Use - O

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20. Chapter 13 - Table of Contents

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23. Ergodicity and stability of orbits of unbounded semigroup representations

... 77 (2004), 209-232 Ergodicity and stability of orbits of unbounded semigroup representations Bolis ... ... In particular, we establish total ergodicity for the orbits of an (unbounded) strongly continuous ...
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The author, who writes under the pen-name HARUN YAHYA, was born in Ankara in 1956. He studied arts at Istanbul's Mimar Sinan University and philosophy at Istanbul University. Since the 1980s, the author has published many books on political, faith-related
2870 THE SCIENTIFIC MIRACLES OF THE QUR'AN

INTRODUCTION
Fourteen centuries ago, God sent down the Qur'an to mankind as a book of guidance. He called upon people to be guided to the truth by adhering to this book. From the day of its revelation to the day of judgement, this last divine book will remain the sole guide for humanity.
The matchless style of the Qur'an and the superior wisdom in it are definite evidence that it is the word of God. In addition, the Qur'an has many miraculous attributes proving that it is a revelation from God. One of these attributes is the fact that a number of scientific truths that we have only been able to uncover by the technology of the 20th century were stated in the Qur'an 1,400 years ago.
Of course the Qur'an is not a book of science. However, many scientific facts that are expressed in an extremely concise and profound manner in its verses have only been discovered with the technology of the 20th century. These facts could not have been known at the time of the Qur'an's revelation, and this is still more proof that the Qur'an is the word of God.
In order to understand the scientific miracle of the Qur'an, we must first take a look at the level of science at the time when this holy book was revealed.
In the 7th century, when the Qur'an was revealed, Arab society had many superstitious and groundless beliefs where scientific issues were concerned. Lacking the technology to examine the universe and nature, these early Arabs believed in legends inherited from past generations. They supposed, for example, that mountains supported the sky above. They believed that the earth was flat and that there were high mountains at its both ends. It was thought that these mountains were pillars that kept the vault of heaven high above.
However all these superstitious beliefs of Arab society were eliminated with the Qur'an. In Sura Sad, verse 2, it was said: God is He who raised up the heavens without any support... (The Qur'an, 13:2). This verse invalidated the belief that the sky remains above because of the mountains. In many other subjects, important facts were revealed at a time when no one could have known them. The Qur'an, which was revealed at a time when people knew very little about astronomy, physics, or biology, contains key facts on a variety of subjects such as the creation of the universe, the creation of the human being, the structure of the atmosphere, and the delicate balances that make life on earth possible.
Now, let us look at some of these scientific miracles revealed in the Qur'an together.

THE COMING OF THE UNIVERSE INTO EXISTENCE
The origin of the universe is described in the Qur'an in the following verse:
He is the Originator of the heavens and the earth. (The Qur'an, 6:101)
This information given in the Qur'an is in full agreement with the findings of contemporary science. The conclusion that astrophysics has reached today is that the entire universe, together with the dimensions of matter and time, came into existence as a result of a great explosion that occurred in no time. This event, known as The Big Bang proved that the universe was created from nothingness as the result of the explosion of a single point. Modern scientific circles are in agreement that the Big Bang is the only rational and provable explanation of the beginning of the universe and of how the universe came into being.
Before the Big Bang, there was no such thing as matter. From a condition of non-existence in which neither matter, nor energy, nor even time existed, and which can only be described metaphysically, matter, energy, and time were all created. This fact, only recently discovered by modern physics, was announced to us in the Qur'an 1,400 years ago.

THE EXPANSION OF THE UNIVERSE
In the Qur'an, which was revealed 14 centuries ago at a time when the science of astronomy was still primitive, the expansion of the universe was described like this:
And it is We who have constructed the heaven with might, and verily, it is We who are steadily expanding it. (The Qur'an, 51:47)
The word heaven, as stated in this verse, is used in various places in the Qur'an with the meaning of space and universe. Here again, the word is used with this meaning. In other words, in the Qur'an it is revealed that the universe expands. And this is the very conclusion that science has reached today.
Until the dawn of the 20th century, the only view prevailing in the world of science was that the universe has a constant nature and it has existed since infinite time. The research, observations, and calculations carried out by means of modern technology, however, have revealed that the universe in fact had a beginning, and that it constantly expands.
At the beginning of the 20th century, the Russian physicist Alexander Friedmann and the Belgian cosmologist Georges Lemaitre theoretically calculated that the universe is in constant motion and that it is expanding.
This fact was proved also by observational data in 1929. While observing the sky with a telescope, Edwin Hubble, the American astronomer, discovered that the stars and galaxies were constantly moving away from each other. A universe where everything constantly moves away from everything else implied a constantly expanding universe. The observations carried out in the following years verified that the universe is constantly expanding. This fact was explained in the Qur'an when that was still unknown to anyone. This is because the Qur'an is the word of God, the Creator, and the Ruler of the entire universe.

THE SPLITTING ASUNDER OF THE HEAVENS AND THE EARTH
Another verse about the creation of the heavens is as follows:
Do not the Unbelievers see that the heavens and the earth were joined together (as one unit of creation), before We clove them asunder, and We made from water every living thing. Will they not then believe? (The Qur'an, 21:30)
The word ratq translated as sewn to means mixed in each, blended in Arabic dictionaries. It is used to refer to two different substances that make up a whole. The phrase we unstitched is the verb fataqa in Arabic and implies that something comes into being by tearing apart or destroying the structure of ratq. The sprouting of a seed from the soil is one of the actions to which this verb is applied.
Let us take a look at the verse again with this knowledge in mind. In the verse, sky and earth are at first subject to the status of ratq. They are separated (fataqa) with one coming out of the other. Intriguingly, when we remember the first moments of the Big Bang, we see that a single point included all the matter in the universe. In other words, everything, including the heavens and earth which were not created yet, were included in this point in a condition of ratq. This point exploded violently, causing its matter to fataqa and in the process created the structure of the whole universe.
When we compare the expressions in the verse with scientific findings, we see that they are in perfect agreement with each other. Interestingly enough, these findings were not arrived at until the 20th century.
ORBITS
While referring to the Sun and the Moon in the Qur'an, it is emphasized that each moves in a definite orbit.
It is He Who created the night and the day, and the sun and the moon. They swim along, each in an orbit. (The Qur'an, 21:33)
It is mentioned in another verse, too, that the Sun is not static but moves in a definite orbit:
And the sun runs to its resting place. That is the decree of the Almighty, the All-Knowing. (The Qur'an, 36:38)
These facts communicated in the Qur'an have been discovered by astronomical observations in our age. According to the calculations of experts on astronomy, the Sun is traveling at the enormous speed of 720,000 kilometers an hour in the direction of the star Vega in a particular orbit called the Solar Apex. This means that the sun travels roughly 17,280,000 kilometers a day. Along with the Sun, and all planets and satellites within the gravitational system of the Sun also travel the same distance. In addition, all the stars in the universe are in a similar planned motion.
That the entire universe is full of paths and orbits such as this one, is written in the Qur'an as follows:
By the sky full of paths and orbits. (The Qur'an, 51:7)
There are about 200 billion galaxies in the universe, consisting of nearly 200 billion stars in each. Most of these stars have planets, and most of those planets have satellites. All of these heavenly bodies move in very precisely computed orbits. For millions of years, each has been swimming along in its own orbit in perfect harmony and order with all the others. Moreover, many comets also move along in the orbits determined for them.
The orbits in the universe do not only belong to celestial bodies. The galaxies also travel at enormous speeds in computed, planned orbits. During these movements, none of these celestial bodies cuts across another's path, or collides with another.
Surely at the time the Qur'an was revealed, mankind did not possess today's telescopes or advanced observation technologies to observe millions of kilometres of space, nor the modern knowledge of physics or astronomy. Therefore, at that time, it was not possible to determine scientifically that space is full of paths and orbits as stated in the verse. However, this was openly declared to us in the Qur'an that was revealed at that time:–because the Qur'an is the word of God.


About the Author

The author, who writes under the pen-name HARUN YAHYA, was born in Ankara in 1956. He studied arts at Istanbul's Mimar Sinan University and philosophy at Istanbul University. Since the 1980s, the author has published many books on political, faith-related and scientific issues. http://www.harunyahya.com

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