Deimos is one of Mars’ two moons, discovered by American astronomer Asaph Hall in 1877. The smaller outer moon orbits Mars every 30 hours, 11 minutes, and 9 seconds at a distance of 20,000 kilometers. Deimos has a diameter of 12 kilometers and is named after Ares’ son in Greek mythology. Deimos orbits Mars at…
Quasars are exceptionally luminous active galactic nuclei powered by supermassive black holes at galaxy cores. They emit massive amounts of electromagnetic radiation across the spectrum, outshining entire galaxies. Quasar light is visible from billions of light-years away, offering insights into early universe formation and black hole evolution. Most observed quasars have redshifts greater than 1,…
The Kuiper Belt is a circumstellar disc in the outer solar system, extending from Neptune’s orbit at 30 astronomical units (AU) to approximately 50 AU from the Sun. It contains numerous small, icy bodies and dwarf planets, including Pluto, Eris, Haumea, and Makemake. Kuiper Belt objects are primarily composed of frozen volatiles such as water,…
Exoplanets are planets orbiting stars outside our solar system. Astronomers discovered the first confirmed exoplanet in 1992. Thousands of exoplanets have been found since, ranging from rocky terrestrial worlds to massive gas giants. Some exoplanets exist in habitable zones of stars, potentially providing conditions suitable for life as we know it. Trillions of exoplanets are…
Dwarf planets are small celestial objects orbiting the Sun that meet specific criteria. The International Astronomical Union (IAU) defines dwarf planets as bodies that orbit the Sun, have sufficient mass for hydrostatic equilibrium, and fail to clear their orbital neighborhoods. Five officially recognized dwarf planets exist in our solar system: Ceres, Pluto, Haumea, Makemake, and…
TON 618 is a hyperluminous quasar located near the border of Canes Venatici and Coma Berenices constellations. Its comoving distance from Earth is 3.2 billion parsecs. TON 618’s luminosity is 40 billion times greater than the Sun’s. The supermassive black hole powering TON 618 has an estimated mass of 6.6 billion solar masses. TON 618’s…
J1407b is a massive exoplanet or brown dwarf located 430 light-years from Earth. J1407b orbits a young, sun-like star called J1407 in the constellation Scorpius. J1407b’s mass is estimated to be 10-40 times that of Jupiter. J1407b possesses an enormous ring system measuring approximately 90 million km in radius. The rings appear 200 times larger…
The Milky Way is a large barred spiral galaxy containing 200-400 billion stars. It spans approximately 100,000 light-years in diameter. Observers on Earth see it as a bright, hazy band of light across the night sky. The galaxy’s center is located 26,000 light-years away from Earth in the direction of the constellation Sagittarius. A supermassive…
A solar system is a collection of celestial bodies orbiting a central star. Our solar system contains eight planets, five dwarf planets, over 190 known moons, and numerous smaller objects. The Sun contains 99.8% of the solar system’s total mass. Solar system objects include planets, dwarf planets, moons, asteroids, comets, and Kuiper belt objects. Our…
Astronomers are scientists who study celestial objects and phenomena beyond Earth’s atmosphere. Their research encompasses stars, planets, galaxies, black holes, and cosmic origins. Astronomers observe and analyze data from telescopes, space probes, and other instruments to increase understanding of the universe. They develop theories and models to explain astronomical observations and phenomena. Becoming an astronomer…
Astronomy originated in ancient times, with evidence dating back to 40,000 BCE. Early astronomical observations were recorded in the Upper Paleolithic period. Mesopotamian civilizations made the earliest documented observations around 2500 BCE. Babylonians recorded celestial knowledge on clay tablets circa 2000 BCE. Ancient societies used astronomy for calendars, astrology, and understanding the universe. Greeks established…
Astronomy encompasses a vast array of fascinating terms and concepts. The field spans from celestial mechanics to astrophysics, covering phenomena both near and far in our universe. Astronomers use specialized terminology to describe cosmic objects, events, and processes. Understanding these terms provides insight into the workings of the cosmos. The 134 astronomy terms from A…
Astronomy and astrology are two distinct fields that study celestial bodies. Astronomy is a scientific discipline focused on understanding the physical properties and behavior of celestial objects. Astrology is a pseudoscience claiming celestial bodies influence human affairs and earthly events. Astronomers use advanced telescopes and mathematical models to analyze celestial phenomena. Astrologers rely on horoscopes…
The universe contains an immense number of galaxies. Estimates range from 100 billion to 2 trillion galaxies in the observable universe. Recent astronomical surveys suggest hundreds of billions of galaxies exist in the visible cosmos. Researchers propose up to 2 trillion galaxies when accounting for “missed” galaxies due to current technological limitations. Approximately 100 billion…
Zeta Reticuli is a binary star system located 39.5 light-years from Earth. The system resides in the Reticulum constellation and consists of two Sun-like G-type stars, Zeta-1 and Zeta-2 Reticuli. Zeta Reticuli is visible to the naked eye from Earth’s southern hemisphere, appearing as a double star. Astrobiologists study the system for potential life-supporting planets…
Betelgeuse is a massive red supergiant star in the Orion constellation. It occupies the hunter’s shoulder position and is visible to the naked eye in the night sky. Betelgeuse ranks as the 10th brightest star, with its brightness fluctuating in a semi-regular pattern. Its diameter measures 700-900 times larger than our Sun, extending past Mars’…
UY Scuti is a red supergiant star in the constellation Scutum. It lies 9,500 light-years from Earth and has a radius 1,708-2,100 times that of the Sun. UY Scuti’s brightness fluctuates between magnitude 8.9 and 10.5, classifying it as a pulsating variable star. The star has a cool surface temperature of 3,300 Kelvin, giving it…
T Coronae Borealis is a recurrent nova located 3,000 light-years away in the Corona Borealis constellation. The binary star system consists of a white dwarf and a red giant companion, orbiting each other every 227.5 days. T Coronae Borealis experiences periodic explosive eruptions every 80-100 years, causing a 10,000-fold increase in luminosity. Astronomers predict T…
Radio telescopes are specialized astronomical instruments used to detect and study radio waves emitted by objects in space. These instruments consist of large antennas or curved dishes that collect and focus radio waves towards receivers. Radio telescopes operate by capturing electromagnetic waves across a wide range of wavelengths, from millimeters to meters. Parabolic dishes reflect…
The Galileo Galilei telescope, known as the Galilean refractor, is a pioneering instrument in astronomy. Galileo did not invent the telescope but significantly improved its design after hearing about the “Dutch perspective glasses” in 1609. Galileo Galilei telescope consisted of a main tube with separate housings for the objective and eyepiece lenses. Galilean telescope used…
Hans Lippershey, a German-Dutch spectacle-maker born around 1570, is generally credited with the invention of the telescope. Hans Lippershey applied for a patent for his telescope design in 1608, which used a pair of lenses to magnify objects three times larger than they appeared to the naked eye. Telescope invention revolutionized the way people viewed…
Lyman Spitzer was an American astrophysicist and theoretical physicist born on June 26, 1914. Lyman Spitzer earned his doctorate from Princeton University in 1938 and later became the chairman of the Astrophysical Sciences Department and director of the Princeton University Observatory. Spitzer’s most significant contribution to astronomy was his pioneering idea of a space telescope,…
Jacob Metius, born in Alkmaar around 1580, was a Dutch mathematician, optics expert, and instrument-maker. Jacob Metius’s work in lens grinding led to significant advancements in optical technology. Metius submitted a patent application for an optical telescope in 1608, just a few weeks after Hans Lippershey’s application for a similar device. Metius’s design combined a…
Zacharias Janssen, a Dutch spectacle-maker born between 1580 and 1588, is often considered the ‘father of microscopy’ for his pioneering work in creating the first compound microscope around 1590. Along with his father, Hans Janssen, they developed a microscope with two convex lenses placed within a tube, allowing for higher magnification and clearer observation of…
Tycho Brahe was a Danish astronomer born in 1546 who became famous for his accurate and comprehensive observations of celestial bodies, earning him the title of the greatest pre-telescopic astronomer. Tycho Brahe observed a new star in 1572, now known to be a supernova, which challenged the Aristotelian belief in the unchanging nature of the…
Galileo Galilei, born in 1564, was a prominent Italian scientist who significantly influenced physics, mathematics, and astronomy. Galileo is often referred to as the “father of modern science” due to his commitment to the experimental scientific method. Galileo improved the telescope, which he used for groundbreaking astronomical observations. He discovered mountains and craters on the…
Sky-Watcher is a telescope company that was founded in 1999. Sky-Watcher was established in Taoyuan, Taiwan by David Shen. Since its inception, the company has grown to be one of the largest and most innovative telescope brands in the world. Sky-Watcher prioritizes the balance between quality and affordability. Over the years, they have expanded their…
Vivitar is a consumer electronic company that produces telescopes. The company was founded in Santa Monica, California in 1938 under the name “Ponder and Best”. Vivitar has since grown to be one of the largest optic producers around the globe. Vivitar telescopes are a common choice for beginner astronomers due to their simple designs, low…
Gskyer is a German telescope company founded in July 1992. The company went out of business and was purchased by Yuyoa Bojing Optical Instrument Factory on July 6, 2011. Since its inception, Gskyer has established a wide user base and a strong reputation for entry-level telescope production. Gskyer’s business activity has shifted greatly due to…
Tasco is an optics company that produces telescopes. Tasco was established in 1954 by George Rosenfield in Miami, Florida. Over the years, Tasco has grown to be a significant player in the optics industry, with a team that spans internationally. Tasco is recognized for its telescopes, but the brand produces various optical devices. These optical…
Meade is a telescope manufacturer that was established in 1972 in Irvine, California. The Meade company was founded by John Diebel. Today, Meade has grown into one of the largest telescope manufacturers around the globe. Throughout Meade’s operation, the CEO has changed multiple times. Steve Murdock is currently the CEO, continuing Meade’s legacy of innovation….
Orion is a telescope company that has provided high-quality optics since 1975. In 1975, Orion Telescopes & Binoculars was founded in a garage in Santa Cruz, California by Tim Gieseler. Orion’s initial models focused on functionality and user-friendliness, setting the stage for the more intricate designs that followed. Over the past 48 years, Orion has…
Celestron is a telescope brand distinguished by its innovation and quality in telescope design and manufacturing. Celestron was founded in May of 1964 in Torrance, California by Tom Johnson, an American electronic engineer. Celestron has since grown into one of the largest and most reputable telescope companies. Tom Johnson founded the parent company of Celestron,…
Telescopes require regular cleaning to maintain optimal performance. Proper cleaning techniques preserve delicate optics and prevent damage. Exterior surfaces and eyepieces are cleaned with soft dry tissues. Lenses are gently wiped in circular motions using moistened lens cleaning tissues. Specialized solutions are used for cleaning mirrors. Cleaning should be performed every 6-12 months to maintain…
Knowing how to properly focus a telescope is crucial to obtaining clear and detailed astronomical observations. Different brands have unique mechanisms or nuances, but the fundamental principle of focusing remains consistent. In general, telescopes are focused by adjusting an external knob or mechanism that changes the distance between the eyepiece and the telescope’s primary lens…
Taking pictures of the moon with a camera and a telescope requires careful planning of the moon phases, timing, location, and equipment setup. It is important to understand the moon phases to know when the moon will be in the desired phase for photography. Planning the time to photograph the moon involves checking moonrise and…
Yes, telescopes can produce both real and virtual images. The type of image produced by a telescope depends on the type of telescope and the configuration of its optical components.Refracting telescopes, which use lenses, typically produce real images because the final image is formed by the convergence of actual light rays at the focal plane….
An observatory is a telescope building that provides a permanent and secure space for a telescope to be used for long-term astronomical observations and research. They are typically designed with features such as a dome that can be opened and closed to protect the telescope and control the amount of light entering the viewing area….
Yes, most of modern telescope eyepieces are universal, however older eyepieces are not universally interchangeable. The interchangeability of telescope eyepieces depends on the telescope’s design and the focal length of the eyepiece. Telescopes that use a 1.25-inch or 2-inch diameter barrel system can accept eyepieces of those sizes. However, some telescopes, particularly older or entry-level…
If you have inherited a telescope, there are several steps you can take to determine its condition and usability. First, carefully inspect the telescope for any visible damage or wear, such as dents, scratches, or misalignments in the components. Check the optics, such as the lenses or mirrors, for any cracks or chips. Next, assess…
For planet viewing, refractor telescopes are the best telescopes for beginners because they have excellent contrast and resolution for viewing the Moon and planets up close. They are also the easiest telescope type to use and require the least maintenance. However, for more advanced planet viewing, especially if you are interested in astrophotography, you will…
Thinking about buying a dobsonian? It’s a big decision and one that’s not made lightly. I have laid out a lot of information here that will help you. -The Telescope Nerd If you are considering the purchase of a Dobsonian telescope you are making a great decision. This type of telescope offers you remarkable light…
Barlow lenses are diverging optical devices used to increase magnification in telescopes and microscopes. These negative lenses extend the effective focal length of optical systems, doubling or tripling magnification without replacing existing components. Barlow lenses are available in 2x or 3x magnification powers and come in achromatic or apochromatic versions. Common specifications include 10-30 mm…
The Optical Tube Assembly (OTA), also called the optical tube, is a part of the telescope that houses the optical components, such as the primary and secondary mirrors. Knowing the design and function of the OTA is crucial as it determines the operational capabilities, resolution, and sensitivity. The primary function of the optical tube assembly…
A telescope focuser is a part of the telescope that adjusts the eyepiece’s distance from the primary optical component to ensure sharp images. Knowing which type of focuser to use allows astronomers to improve the precision and clarity of an image. The primary function of the focuser is to adjust the position of the eyepiece…
A telescope filter is a part of a telescope that modifies wavelengths of light to enhance the visibility of celestial objects. Telescope filters function by selectively transmitting certain wavelengths of light. This selectivity enhances contrast and detail while protecting the eyes from excessively bright objects. Knowing which telescope filter to use for a specific observation…
A catadioptric telescope, or compound telescope, is a type of telescope that combines the principles of both reflection and refraction by using mirrors and lenses. Knowing how the mirrors and lenses work together is crucial to taking advantage of the full potential of catadioptric telescopes. A catadioptric telescope captures and focuses light from distant objects…
The first documented telescope was created in the Netherlands in 1608, when Hans Lippershey, an eyeglass maker, filed for the first patent for this optical device. While it wasn’t initially invented for astronomy, this design opened the door to an entirely new field of study. When Was the First Telescope Invented? The first telescope was…
The McDonald Observatory, otherwise known as the Hobby-Eberly Telescope, is located in Fort Worth, Texas, in the United States. During my trip around the United States, I spent a day visiting the observatory and it had a lot of events and scheduled things to do. From tours to other events, it seems like there is…
I take a lot of photographs of the night sky. These photos are usually less than 30 seconds in exposure length. But sometimes I catch a meteor! But, I also get airplanes in my photographs. So, how do you tell the difference? I managed to get this one photograph that has both a meteor and…
I took a trip to Arizona specifically to see the Grand Canyon. But while doing my research on what else to see in the state I realized that I could also visit this wonderful observatory with a long history (Which includes the discovery of Pluto). It is right inside Flagstaff Arizona which is only an…
An 8-inch telescope is an excellent option for those looking for an affordable spy glass that can see some impressive details. This binoculars can provide stunning views. This type of spy glass can see a lot. It can see objects up to 2,000 times fainter than the human eye. This makes it perfect for viewing faint objects…
Are you interested in astronomy? Do you want to view the stars and planets up close? If so, then you need to buy a telescope. Telescopes allow you to see things that are far away in incredible detail. We will teach you how to buy a perfect telescope for your needs. We will discuss the different types…
“A Universe from Nothing” by Lawrence Krauss presents the argument that the universe emerged from a quantum vacuum, a state of “nothing” filled with virtual particles and antiparticles constantly appearing and disappearing. Krauss asserts that the laws of physics can explain the origins of the universe without the need for a divine creator. In “Packing…
The picture below shows a picture I took of the constellation Sagittarius. The bright object is Jupiter. This was done with a 30 second exposure and 800 speed 35 mm film. At The Bottom of this page I have a video Tutorial of this if you prefer to watch a video. Some basic tips for…
How to take Moon Pictures with a DSLR and a telescope (How to connect your digital camera to a telescope) This is a first tutorial – There is a whole lot more you can do with this but we will start by talking about how easy it is to take pictures of the moon using…
The Telescope has a four hundred year history and in this time there have been a lot of astronomers and telescope makers who have built telescopes, made discoveries and advanced astronomy in remarkable ways. These links are to articles written on this website about many of these famous people. This is a list that is…
One of the most respected manufacturers of telescopes If you are looking for quality and a company with a very long track record of making top of the line telescopes then you are looking for a Celestron telescope. Here is a selection of some of their telescopes that you can purchase through amazon.com. They run…
100 Year old refractor still in perfect condition The Ladd Observatory is part of the physics department at Brown University in Providence, RI. The observatory opened in 1891 and it houses a variety of instruments including a gorgeous 12″ refractor telescope made by John A. Brashear. They have one night a week (tuesday) open to…
I have three separate lists that all come from the official amazon number and this list is updated hourly by amazon.
William Herschel was a British astronomer, telescope maker, and musician known for discovering the planet Uranus in 1781. He made significant contributions to the field of astronomy and telescope technology as an observational astronomer, telescope maker, and scientist. Herschel discovered Uranus through a combination of luck, persistence, and dedication to astronomy. He happened to be…
The Maksutov-Cassegrain (Mak) telescope is a type of catadioptric telescope that employs both mirrors and lenses to produce an image. Its design incorporates a thick meniscus corrector lens and a spherical primary mirror, efficiently reducing optical aberrations. The Maksutov is recognized for delivering high contrast, particularly in planetary observation, and has become a preferred choice…
The Cassegrain reflector is a type of telescope that uses a combination of a concave primary mirror and a convex secondary mirror to gather and refocus light, producing magnified images of distant celestial objects. Knowing the interplay between these mirrors is vital to optimizing observations with the Cassegrain design. The Cassegrain telescope’s ability to provide…
The Schmidt-Cassegrain Telescope (SCT) is a compound telescope that combines mirrors and lenses to create an image. The SCT uses a spherical primary mirror, a secondary mirror, and a corrector plate to correct spherical aberration, resulting in a compact and adaptable instrument. The SCT is known for its portability and versatility among both amateur astronomers…
Telescope mounts are mechanical structures that support and control telescopes. Mounts consist of a base, support system, and mounting head, enabling precise positioning and tracking of celestial objects. The base provides stability, the support system allows smooth motion, and the mounting head secures the telescope. Telescope mounts come in various types, each designed for specific…
Telescopes are designed, manufactured and distributed by a wide variety of companies. Each brand distinguishes itself through unique specializations, ranging from advanced technology and premium optics to affordability and user-friendliness. This diversity allows astronomers to determine the optimal telescope for a specific observation. Knowing a specific telescope brand’s manufacturers provides observers with deep insight into…
The eyepiece, often called the ocular lens or telescope eye lens, plays a critical role in determining magnification, field of view and overall clarity of celestial observations. The eyepiece is a part of the telescope through which an observer looks. The primary function of the eyepiece is to magnify the image rendered by the telescope’s…
The objective lens is a part of a refracting telescope that collects and focuses light from distant objects. Knowing the design and material of an objective lens is crucial as it influences the telescope’s field of view, magnification, and overall performance. The shape of the objective lens is convex, meaning it bulges outward. This design…
Knowing the anatomy of a telescope is fundamental to determining the telescope types, functions and abilities. Recognizing the main parts and how they work together allows astronomers to customize their setup based on their observational goals. Telescope parts refer to the components that allow telescopes to collect, focus and magnify light for observation. Each component…
A Newtonian telescope, invented by Sir Isaac Newton, is a type of reflecting telescope. Newtonian telescope uses a concave primary mirror and a flat secondary mirror to gather and focus light from distant celestial objects. Newtonian telescope is known for its simple and efficient design, making it popular among amateur astronomers. It provides wide field…