Barlow Lenses and Focal Reducers

Simply, it's a concave (negative) lens placed between a telescope objective and eyepiece to increase the magnification, usually by two or three times. The negative lens reduces the angle of convergence of the light cone, effectively making it appear to the eyepiece that the primary has a longer focal length. It was invented in the early1800s by English physicist Peter Barlow (1776–1872)

Crop Circles, History and Theories

Strange circles or unusual geometric designs have been discovered in cereal crops around the world, even in the rice paddies of Japan. The designs are often hundreds of feet in diameter and length and may cover many acres. While many people believe that crop circles are a comparatively recent UFO-related phenomenon that began in the late 1970s or early 1980s, the mystery of the crop circle is hardly new. Unexplained geometric designs occurred in the fields of wheat and corn in Scotland in 1678, and rural residents of England speak of the "corn fairies" that made similar designs in the fields in the late 1800s.

Eyepieces for Telescope

What is the Eyepiece

The eyepiece is the lens assembly at the focal point of the telescope that forms and magnifies the image. Most telescopes, even department store types, come with at least one for initial use. Sadly today many of the major manufacturers deliver their telescopes with just that one eyepiece. Today’s Celestar 8 and Nexstar 8 telescopes,the current editions of the legendary Celestron C8, come with only a single 25-mm Plossl eyepiece (though Celestron does offer a nice observing kit that adds five more eyepieces and a filter set for under $100).

Science for Kids: Things you didn't know about Light

What is "Light"

Light is a type of energy. It is a form of electromagnetic radiation of a wavelength which can

be detected by the human eye. In physics, the term light sometimes refers to electromagnetic

radiation of any wavelength, whether visible or not. Light exists in tiny packets called photons.

It shows properties of both waves and particles. The study of light, known as optics, is an important

research area in modern physics.

What are the types of galaxies

Galaxies are certainly among the most popular telescope targets for amateur astronomers. They show an incredibly wide range of size, shape, and internal structure has undoubtedly lead to their fascination among both amateurs and professional astronomers alike. they are vast groups of stars, dust, and gas ranging from a few thousand to nearly a million light-years in diameter. 

Their respective masses show a similarly broad range from less than a million to well over trillion solar masses. This variety of shape and form is far greater than in any other class of deep sky objects.

Inception Lucid Dreaming, The Easy Way

Inception was a major blockbuster movie introduced in summer 2010, indeed was a stunning movie yet mind blowing one, written and directed by Christopher Nolan (The Dark Knight, Memento) and starring an international cast (Leonardo DiCaprio, Ellen Page, Cillian Murphy, Joseph Gordon-Levvit and Michael Cain). It was held in the near future and it's main idea was about controlling and sharing dreams by a matrix-like system, also talks about sub-dreams or dreams within dreams, and inserting ideas to the subconscious using "dreams", So it's all about dreaming, although sub-dreams and dreams sharing are pure science fiction(so far), there is a method you can do to control your own dreams and make it vivid as possible using the massive engine in your head called the "subconscious", this method is known as "Lucid Dreaming", it is not easy to achieve and need a lot of training, but here i'm going to tell you how it's done easily with minimum practice.

Gamma Ray Burst Danger and Studies

For 25 years, cosmic gamma ray bursts (GRBs) have been one of the great mysteries of modern astronomy. GRBs have given us several clues as to what they might be. GRBs were seen to occur frequently and appeared to be spread evenly over the sky. Their distribution on the sky indicated that they were the result of events happening either very close or very far (in other galaxies). The events were not, for example, seen to be concentrated in the plane of our Galaxy.

What are Nazca Lines

The Nazca Lines, also known as Nazca figures, Nazca Pictures and Nazca Images, are an engima. No one know who had built them or indeed why. Since their discovery, the Nazca Lines have inspired fantastic explanations from ancient gods, a landing strip for returning aliens, a celestial calendar, used for rituals probably related to astronomy, to confirm the ayllus or clans who made up the population and to determine through ritual their economic functions held up by reciprocity and redistribution or, a map of underground water supplies.

When Giant Black Holes Collide

,,When giant black holes collide, the surrounding space-time trembles,,

The collision of two supermassive black holes in the aftermath of a galaxy merger is the ultimate cosmic cataclysm, throwing out more energy for about an hour than all the visible stars in the entire universe combined. Moreover, in order to form the billions of majestic galaxies scattered across the sky, astronomers think that such events must have happened frequently as the first galaxies consolidated and grew.

What happens when galaxies collide?

When two nearby galaxies attracted to each other by their gravitational force (a relatively common event in galaxy evolution), their gases collide violently. As gas and dust smash together at speeds of millions of miles an hour, they combine the raw materials for new born stars in an amazing hot and bright display, and eventually -in some cases- causes a super massive black hole from this collision.