What is a Comet?

!9#: What is a Comet?

Comets are small Solar System bodies that are caught in the Sun's orbit. When a comet is close to the sun they exhibit a visible coma, otherwise known as a tail, which effects the solar radiation from the comet's nucleus. Comet nuclei are made up of loose collections of ice, dust, and small rocky particles.

The orbit of a comet ranges from a few years to hundreds of thousands of years. Some comets flow through the Solar System once before being thrown out into interstellar space. Short period comets are thought to be created in the Kuiper belt (which is associated with the scattered disc) while long period comets originate at a great distance from the sun, perhaps in the Oort cloud. These comets are thought to be made of debris left over from the condensation of the solar nebula. Comets are thrown into the inner solar system by the gravitational push of other stars.

The trail of debris following comets is what shows as a comet's path crosses the earth's path. A meteor shower occurs every year between August ninth and thirteenth when the Earth passes through the orbit of the comet Swift-Tuttle. Halley's Comet causes the Orionid shower in October.

Comets are easily distinguished from asteroids by the presence of the comet tail, also known as a coma. However, very old comets may have lost all of their volatile materials that cause a coma and may eventually resemble asteroids. Asteroids are suspected to form in the inner Solar System, rather than the outer Solar system.

As of June 2008 there were 3475 known comets reported. Several hundred of these comets appear to be short period comets. However, the number of comets appear to be steadily increasing. This number does represent a small amount of the total potential comet population.

What is a Comet?

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Vikram Virulkar proud owner of a Celestron Osba telescope

!9#: Vikram Virulkar proud owner of a Celestron Osba telescope

For most of the viewers, watching total solar eclipse would mean traveling to places that would offer 100 per cent view. But for 21-year-old, Vikram S Virulkar an astrographer by profession watching the century's longest solar eclipse would mean just walking up towards the building terrace, where he will be setting up the telescope which he especially bought from US which is worth Rs 2lakh. In order to make sure that he doesnt miss the eclipse, which may be viewed 123 years later. Story & Video By - Urvashi Seth, MiD-DAY

Vikram Virulkar proud owner of a Celestron Osba telescope

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Space - Which is the Reference Point For Our Universe?

!9#: Space - Which is the Reference Point For Our Universe?

Think of your home. If someone was to ask you where is your home, you would give landmarks, street number and other details to point out the location of your home. Same thing applies to your state, your country. Where is the USA? You will answer- north of Mexico and south of Canada. Are you getting the drift of my discussion? We have reference points for all locations on the earth. Similarly we have reference points of stars in the universe. When we think of the sun as stationary with reference to space, we can locate other stars. Sun is the reference point for locating then. But what about reference point of the universe itself?

If you were to assume that the universe was not infinite but finite and with a shape then you need to get a reference point for that. This provided you think that there are other universes in the space. Where does the boundary of our universe end? What is beyond that? If our universe is part of larger space, then only space must be beyond our universe. Then there should be another universes somewhere else. This brings us to the question- Are we alone in the larger Universe? Is our universe the only one in the larger universe or there are other universes. No clear answer is yet available for this.

Universe is a great mystery. We look at stars and forget to think that there are stars beyond, and more beyond, at distances that defy human comprehension. What are these stars doing there? What lies beyond? It is all a big mystery. The existence itself is a big mystery. A small atom has a nuclei that has protons- all positive charged together, and we have stars that match the forces so very well that everything looks just perfect. Difficult to understand - Go ahead and think.

Space - Which is the Reference Point For Our Universe?

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!9#: Celestron 21061 AstroMaster 70 AZ Refractor Telescope

Brand : Celestron | Rate : | Price : $127.99
Post Date : Jan 04, 2012 13:54:12 | Usually ships in 2-3 business days

Celestron 21061 AstroMaster 70 AZ Refractor Telescope

• Quick and easy no-tool setup
• Permanently mounted StarPointer
• Erect image optics - Ideal for terrestrial and astronomical use
• Quick release dovetail attachment - no tool setup
• Pan handle Alt-Az control with clutch - for smooth and accurate pointing

More Specification..!!

Celestron 21061 AstroMaster 70 AZ Refractor Telescope

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Celestron 21036 PowerSeeker 70AZ Telescope (Black)

!9#:Celestron 21036 PowerSeeker 70AZ Telescope (Black)

Brand : Celestron
Rate :
Price : $89.99
Post Date : Dec 26, 2011 05:31:53
Usually ships in 2-3 business days

Celestron PowerSeeker telescopes are a great way to open up the wonders of the Universe to the aspiring astronomer. The PowerSeeker series is designed to give the first-time telescope user the perfect combination of quality, value, features and power. Amateur astronomy is a great family hobby that can be enjoyed year round, and Celestron’s PowerSeekers are the ideal choice for families looking for an affordable and high quality telescope that will provide many hours of enjoyment for children and adults alike.

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Buy a Cheap Orion Telescope

!9#: Buy a Cheap Orion Telescope

It won't be hard to find a cheap Orion telescope. This is because Orion is a very popular manufacturer of telescopes and they often provide models at discounted rates for amateur astronomers. Along with the percentage off, they also sell equipment and accessories for the cheap Orion telescopes.

This kind of service operates in a lot of stores in California. One can also get cheap Orion telescopes in online store. In fact, some manufacturers offer discounts for their customers if they sign up for the product on their homepage.

Orion Telescopes was founded in 1975 by Tim Gieseler. During the mid 90s to 2005, Orion sold binoculars, telescopes, and accessories under the brand that they are known for - which is "Orion", obviously.

However, since the company was acquired by Imaginova, Orion had to sell non-Orion products such as eyepieces from Televue and accessories for Celestron telescope.

The whole point of a cheap Orion telescope is to make a sale to the customers. They can lure in the amateur astronomers and make them interested in the star-gazing hobby. It is also important to note that there are experienced astronomers who still go for a cheap Orion telescope because they get to save money. They know that as long as they get the features that they are looking for in a telescope, they're set. That's what's important anyway.

Another thing that makes Orion telescopes different from the other brands of telescopes is that they group their telescopes in levels. These are "beginner", "intermediate", and "advanced." The level of the cheap Orion telescope determines which is the right model for the astronomer.

With the levels, he can also determine whether the telescope is what he needs in order to view what he want to see.

There are different mounts to choose from as well. The mounts allow the astronomer to see the scenery better. It may be cheaper, but they still keep up with their reputation of high performance. Orion has two element apochromatic refractors.

These are manufactured in China. The user can adjust the low dispertion of the objective lenses. In doing so, what he is seeing is clearer and he can appreciate it better.

A cheap Orion telescope for terrestrial and astronomical observation are currently sold in the market. The microscopes and the monocular spotting perfumed by the telescope is the best method to use when bird watching.

The resolution of this telescope can be adjusted to reach the stars or just right across the field.

Buy a Cheap Orion Telescope

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Planet Jupiter through telescope Celestron nexstar 130 SLT

!9# Planet Jupiter through telescope Celestron nexstar 130 SLT

Jupiter viewed in January 24 2011, through celestron nexstar 130 slt

Planet Jupiter through telescope Celestron nexstar 130 SLT

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