The 10 Best Telescopes
Bringing Perspective A Little Closer
If humans had given up on curiosity, then it's possible everyone would still believe the Earth is flat.
One of the most important aspects of a telescope is its aperture through which light will travel.
Humans have always been curious about the world around them. Though just the first step, this very curiosity has allowed technology to evolve along with it. By itself, curiosity does not provide all the answers, but it does encourage imagination, the desire to hone one's thoughts, the desire to grow, and to experiment with technology that will serve that curiosity. I will never say that human curiosity is fully satisfied. In fact, the more scientific breakthroughs that occur, the less inclined I'd be to believe human curiosity is ever satisfied.
If humans had given up on curiosity, then it's possible everyone would still believe the Earth is flat. Without an awareness of what's around you and how things appear, you wouldn't begin to suspect that perhaps the Earth was round due to the observation of moon phases over time and the spherical shape of the Earth's shadow that is cast on the moon's surface. On the same parallel, with the invention of a unique tool like the telescope, our definition of what it means to think outside the box changes dramatically.
By definition, a telescope is an optical instrument with a primary purpose of making distant objects appear close and easy to see. This is accomplished through the use of either an arrangement of lenses or, as worded in the Oxford English Dictionary, an arrangement of both curved mirrors and lenses, by which rays of light are collected, focused, and the resulting image is magnified. A majority of telescopes focus on detecting electromagnetic radiation.
One of the most important aspects of a telescope is its aperture through which light will travel. The aperture determines the degree of brightness and sharpness you see through a telescope. The diameter of a telescope's aperture is directly proportional to the level of detail you see when you look through it. As an example, a telescope with a ten-inch aperture will make distant objects appear sharper than one with only a five or six-inch aperture.
A telescope's power is another important piece of the puzzle for determining the degree of mangification it will offer. This is an integral consideration for the budding astronomer who wants to see outer space and the surrounding planets as closely and as clearly as possible.
Telescopes are classified into refracting, reflecting, and catadioptric types. They all share the same purpose of collecting light and bringing it to a point of focus so that it can be magnified with an eyepiece, but each type accomplishes this in its own way.
Refracting telescopes are the most common and usually take the form of long, thin tubes that allow light to pass in a straight line from the front objective lens right to their eyepieces. The reflecting telescope leverages a large and concave parabolic mirror to collect and focus light to a flat secondary mirror. The secondary mirror then reflects the image out of the opening at the side of the main tube. Catadioptric telescopes use both lenses and mirrors to fold optics and form an image.
A Brief History Of The Telescope
The earliest known telescopes date back to the beginning of the seventeenth century and are credited to Middelburg spectacle makers Hans Lippershey, Zacharias Janssen, and Dutch instrument maker Jacob Metius of Alkmaar. By the year 1609, Galileo Galilei used and improved upon the design of the Dutch telescope.
Radio astronomy interest continued to grow beyond the time of World War Two as dishes were leveraged in larger sizes.
Galileo also became the first person to use a telescope for observing celestial objects in the sky, which has become one of the most common uses for many of the cutting-edge telescopes today. In 1668, Sir Isaac Newton invented the first practical reflector telescope, also referred to as the Newtonian reflector.
Thanks to the invention of the achromatic lens, color aberrations in objective lenses were reduced, while telescopes could be made shorter and more functional in design. These began to appear by the middle of the eighteenth century.
By 1931, new telescopes that produced images using wavelengths other than visible light helped to evolve a new type of observational astronomy, thanks to Karl Jansky's discovery that the Milky Way was a source of radio emissions. This further spawned the development of wavelength-specific telescopes that included the infrared, ultra-violet, X-ray, and gamma-ray telescopes.
Building on Jansky's ideas, Grote Reber built a sophisticated radio telescope in 1937 that included a thirty-one-foot dish, which made it possible to discover unexplained radio sources in the sky. Radio astronomy interest continued to grow beyond the time of World War Two as dishes were leveraged in larger sizes. Dishes are still used today to study naturally-occurring radio light from the stars.
Finding The Best View Of The Night's Sky
One of the first things to consider when purchasing a telescope is what you plan to use it for. For a majority of people, looking to the stars and examining the world around them are definitely reasons to go for the most highly-developed optics.
Depending on where you plan to set up your telescope, definitely make sure it comes with a sturdy stand or tripod that allows for easy mobility. Some telescopes are also designed as tabletop models, which comes in particularly handy when your bedroom desk is close to a large window.
For that person who's into technology, one must find a telescope designed with built-in Global Positioning System (GPS) functionality, which can capture data from satellite imagery.