telescope type For Your Reading PleasureTypes of telescopes What are the advantages of each
Refractors, Newtonian reflectors and Catadioptrics
are the three main types of telescopes. All these
different types have the same purpose, but each
telescope design does it differently. Collecting
light and bringing it to a point of focus so it can be
magnified and examined with an eyepiece is their
goal.
Of the different types of telescopes the refractor
is the telescope most people think of when they
think of astronomy. This type of astronomy telescope
is easy to use and reliable due to the simplicity
of design. It requires little or no maintenance. Its
great for looking at the different types of lunar,
planetary, and binary stars.
Newtonians are a type of telescope, which is also
known as catoptrics. This type is different from
the other telescopes because it has the lowest
per inch of aperture compared to refractors and
Catadioptrics, because lenses are more expensive
to produce than mirrors, especially in medium
to large apertures. Newtonians deliver very bright
images and are low in optical aberrations.
Catadoptric telescopes are the most popular type
of instrument, with the most modern design,
marketed throughout the world in 3 1/2 and larger
apertures. Its very good for looking at different
planetary, lunar, and binary stars. If you like to
take photos with your telescope this type of
instrument is excellent for deep sky observing
or astrophotography with fast films or CCD's.
About the author:
Jeremy Hier makes it easy and quick to decide which telescope
is best for you by going to
best-telescope-guide What's The Difference Between Distance Learning And American Public Schools? John TiptonBefore distance learning and elearning, students in rural
school districts were often at a great disadvantage when it
came to subjects being offered. A small school district
sometimes didn't have the resources to attract teachers
that were in high demand.
Math, science and foreign language classes were often
limited because of this shortage. Today, distance learning
and elearning have changed the way school districts
determine class schedules, making many more opportunities
available to students.
Public schools have changed dramatically over the past
century and a great number of those changes can be put down
to two factors - state and federal mandates governing the
classes that must be offered and requirements for
graduation, and (of course) the ever-increasing world of
technology.
Computers have made the world a global neighborhood in
which anyone can instantly communicate with those from
another country, even if that country is half way around
the world. Language and time differences are virtually the
only barriers. This means that distance learning and
elearning are a part of the curriculum of many schools.
As schools began to connect to the Internet, the immediate
concern in most cases was how to regulate the use. The next
was how to best use the technology to benefit school
districts and students. Distance learning and elearning
became the way to provide options, especially in those
rural districts that couldn't meet state mandates.
Consider the situation of many smaller, rural schools. If
the school is required to offer a foreign language but
can't recruit a teacher, what should happen to that school?
Forced consolidations have been common in some states.
Students lost the benefits of schools in their own towns
and faced long bus rides to new districts.
With distance learning and elearning, more schools can meet
the state and federal mandates to offer specific classes.
Consider yet another situation. A smaller district has four
students who show great promise in their math studies and
it's quickly apparent that they could go well beyond the
normal math classes offered in high school.
There's no one on the teaching staff capable of teaching
those advanced concepts and it's financially impossible to
hire someone for that task alone. Distance learning or e-
earning could provide those classes.
Special needs children are another group to greatly benefit
from distance learning and elearning. While many issues can
only be dealt with between teacher and student, face-to-
face, there are many things that can be taught and learned
online.
Whether the subject of distance learning or elearning is a
foreign language or sign language, and whether the class or
courses are being offered to one student or the entire
student body, distance learning and elearning have become
an important tool for many public schools.
===========================================================
Find out why distance learning lets anyone go back to
school. Discover what you need to look for in a distance
learning program, and what you should avoid. Click
distance-learning-exclusive/distance-learning-colleges.html
About the author:
John Tipton dropped out of school early, and worked boring
jobs for 20 years. Then he discovered 'distance learning'
and finally got the education he missed. After lots of
different courses at lots of different schools, Peter
shares his experience in this series of useful articles.
telescope type Items For ViewingWoodstock D3204 30" 16 lb. Capacity Telescoping Magnet
Woodstock D3204 30" 16 lb. Capacity Telescoping Magnet
Rated for 16 lbs. 30" overall length when fully extended. Oversized cushioned grip for extra comfort.
Galileo Gravitator w/ Amazing Floating Planets
Galileo Gravitator w/ Amazing Floating Planets
Validate Galileo's Gravitation Experiment in Your Own Home -- During the Apollo 15 mission, astronaut Dave Scott dropped two different sized objects and proved Galileo's 300 year old theory that objects in a vacuum will fall at the same rate. Duplicate the results of this famous experiment with the Galileo Gravitator Amazing Floating Planets. -- Spheres representing the Moon, Mars, Jupiter, and Saturn all levitate, rotate, and glow in the darkness using LED illuminators. Perfect as a night light or an intriguing conversational piece of home decor, this gravitator is sure to impress.
The Perfect Machine: Building the Palomar Telescope
The Perfect Machine: Building the Palomar Telescope
Almost a half-century after is completion, the 200-inch Palomar telescope remains an unparalleled combination of vast scale and microscope detail. As huge as the Pantheon of Rome and as heavy as the Statue of Liberty, this magnificent instrument is so precisely built that its seventeen-foot mirror was hand-polished to a tolerance of 2/1,000,000 of an inch. The telescope's construction drove some to the brink of madness, made others fearful that mortals might glimpse heaven, and transfixed an entire nation. Ronald Florence weaves into his account of the creation of "the perfect machine" a stirring chronicle of the birth of Big Science and a poignant rendering of an America mired in the depression yet reaching for the stars.
Gendler Horsehead Nebula Photo
Gendler Horsehead Nebula Photo
Earthly dust may seem insignificant and trivial but the cosmic kind is an all important constituent of matter in the universe and is essential to the star making process. The famous Horsehead Nebula (Barnard 33) represents a dark cloud of dust and non-luminous gas which obscures and silhouettes the emitted light of IC 434 behind it. IC 434 has in turn received all its energy from the bright star Sigma Orionis. Protruding from its parental cloud, the horsehead is really a dynamic structure and a fascinating laboratory of complex physics. As it expands into the surrounding environment areas of the cloud sustain stresses which trigger the formation of low mass stars. One infant star is visible as a partly shrouded glow in horse's brow. Small reddish objects glowing through the dust represent Herbig-Haro objects, light emission of material ejected from invisible protostars.
The surrounding region also contains a multitude of different objects all unique in their own right. The bright emission nebula in the lower left is NGC 2024 (the flame nebula). Infrared studies have revealed a huge cluster of infant stars hidden behind the dust and gas of NGC 2024. The bright blue reflection nebula to the lower left of the Horsehead is NGC 2023. Interstellar dust reveals its presence by blocking light emitted from stars or nebulae behind it. Dust is composed mostly of carbon, silicon, oxygen and some heavier elements. Even organic compounds have been detected.
Distance: 1500 Light Years
Right Ascension: 05 : 41.6 (hours : minutes)
Declination: -02 : 14 (degrees : minutes)
NGC 2023 is one of the brightest reflection nebulae in the sky and is located just east of the Horsehead nebula forming a thin blister at the edge of the molecular cloud L1630. The B type star HD37903, with a surface temperature of 22,000 degrees, is responsible for most of the excitation of gas and dust within NGC 2023 and lies in front of the molecular cloud. A unique feature of NGC 2
Vega 600 Telescope (GeoVision Precision Optics)
Vega 600 Telescope (GeoVision Precision Optics)
Both inquisitive young scientist and adults will enjoy investigating the universe through the precision optics of the Vega 600. With magnifications from 30x to 150x and rack and pinion focusing, stargazers and nature watchers are rewarded with bright, clear images. Plus it's lightweight and simple to use. All glass optics, 50mm objective lens, 2 eyepieces, 2x image erector, 5 x 24mm finder scope, 50" full-height adjustable tripod, and 2-element achromatic objective lens. Ages 8+.
Advanced Telescope Making Techniques
Advanced Telescope Making Techniques
Celestron 52230 12 - 36 x 50mm Mini Zoom Waterproof Straight Spotting Scope
Celestron 52230 12 - 36 x 50mm Mini Zoom Waterproof Straight Spotting Scope
Celestron®'s Mini Zoom Refractor 50-mm Straight View spotting scope packs a lot of performance in a small package. This is an extremely versatile optical instrument that is designed to perform exceptionally well in a wide range of viewing situations. This fully waterproof scope is perfect for bird watching, observing nature, long distance spotting, and enjoying outdoor scenery. The smooth focus and zoom controls are exceptionally easy to use.
Current telescope type NewsHot picks: 'Wicked' Idina Menzel, David Byrne, Louis C.K. (Pittsburgh Tribune-Review)Thu, 06 Nov 2008 05:17:00 GMT
With his high-domed forehead, biker's goatee and belligerent scowl, comedian Louis C.K. might not look like a guy who finds anything in life remotely funny.