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Telescopes
A telescope is a device used to form images of distant objects. There are two kinds: an optical telescope uses lenses and is known as a refracting telescope or a refractor, and a reflecting telescope, which uses a mirror and is known as a reflecting telescope or a reflector. The earliest telescope was a refractor built by the Dutch eyeglass maker Hans Lippershey. This category is for questions related to telescopes, including using them to view distant planets and objects in space.
1,887 Questions
Yes, that's correct. The longer wavelengths of radio waves mean that radio telescopes have poorer angular resolution compared to optical telescopes. This is because resolving power is inversely proportional to the wavelength of the electromagnetic waves being observed.
What does Galileo have to do with the telescope?
Galileo was the first person to use a telescope for astronomical purposes, making significant observations that supported the heliocentric model of the solar system. His astronomical discoveries, such as the moons of Jupiter and the phases of Venus, revolutionized our understanding of the universe.
Why does Pluto take so long to orbit the Sun?
Plutos Orbits length is unusually longer than other planets orbits.But its width is shorter than Neptunes orbit. So at one point in Plutos orbit it is closer to the sun than Neptune. Its estimated time to orbit is around 250 years
The earliest telescopes are called what telescopes?
I believe the name of the first telescope was called the "telescope." The word was created from the Greek tele = 'far' and skopein = 'to look or see'; teleskopos = 'far-seeing'.
To find use the following equation
object size = distance x (smallest angle/57.3°)
Since Arecibo is on Earth, to find the distance take the distance between the sun and Earth (in AU) and subtract the distance between the sun and Venus (in AU). Then multiply the AU by 1.5 x 108 (or the number of kilometers in 1 AU)
1 AU - 0.72 AU = 0.28 AU
0.28 AU x 1.5 x 108 = 4.2 x 107 km
For 1'
object size = 4.2 x 107 x (1/60°/57.3°)
object size = 12216.4 km
For 1"
object size = 4.2 x 107 x (1/3600°/57.3°)
object size = 203.6 km
What is the hubble telescope made out of?
How is a telescope made?
A telescope is a device used to form images of distant objects. The most familiar kind of telescope is an optical telescope, which uses a series of lens-1 or a curved mirror to focus visible light. An optical telescope which uses lenses is known as a refracting-telescope or a refractor; one which uses a mirror is known as a reflecting telescope or a reflector. Besides optical telescopes, astronomers also use telescopes that focus radio waves, X-rays, and other forms of electromagnetic radiation. Telescopes vary in size and sophistication from homemade spyglasses built from cardboard tubes to arrays of house-sized radio telescopes stretching over many miles.
The earliest known telescope was a refractor built by the Dutch eyeglass maker Hans Lippershey in 1608 after he accidentally viewed objects through two different eyeglass lenses held a distance apart. He called his invention a kijker, "looker" in Dutch, and intended it for military use. In 1609, the Italian scientist Galilei built his own telescopes and was the first person to make astronomical observations using them. These early telescopes consisted of two glass lenses set within a hollow tube and were rather small; Galileo's largest instrument was about 47 inches (120 cm) long and 2 inches (5 cm) in diameter. Astronomers such as Johannes Kepler in Germany and Christian Huygens in Holland built larger, more powerful telescopes throughout the 1600s. Soon these telescopes got too large to be easily controlled by hand and required permanent mounts. Some were more than 197 feet (60 m) long.
The ability to construct enormous telescopes outpaced the ability of glassmakers to manufacture appropriate lenses for them. In particular, the problems caused by chromatic-aberration (the tendency for a lens to focus each color of light at a different point, leading to a blurred-2 image) became acute for very large telescopes. Scientists of the time knew of no way to avoid this problem with lenses, so they designed telescopes using curved mirrors instead.
In 1663, the Scottish mathematician James Gregory designed the first reflecting telescope. Alternate designs for reflectors were invented by the English scientist Isaac Newton in 1668 and the French scientist N. Cassegrain in 1672. All three designs are still in use today. In the 1600s, there was no good way to coat glass with a thin reflective film, as is done today to make mirrors, so these early reflectors used mirrors made out of polished metal. Newton used a mixture of copper, tin, and arsenic to produce a mirror which could only reflect 16% of the light it received; today's mirrors reflect nearly 100% of the light that hits them.
It had been known as early as 1730 that chromatic aberration could be minimized by replacing the main lens of the telescope with two properly shaped lenses made from two different kinds of glass, but it was not until the early 1800s that the science of glassmaking was advanced enough to make this technique practical. By the end of the 19th century, refract telescopes with lenses up to a meter in diameter were constructed, and these are still the largest refracting telescopes in operation.
Reflectors once again dominated refractors in the 20th century, when techniques for constructing very large, very accurate mirrors were developed. The world's largest optical telescopes are all reflectors, with mirrors up to 19 feet (6 m) in diameter
Why was the hubble space telescope sent to space?
The Hubble Space Telescope (HST) was launched into space to allow it to view the heavens without the distortion of images caused by looking through the atmosphere itself, the degradation of images caused by the dust in the atmosphere, and the interference caused by ambient light on the surface of the earth. All those problems can be partially overcome by a careful selection of a location for a telescope on earth, but putting the telescope in space completely eliminates all of them, except space dust.
The improvement of the image quality allowed astronomers to look at small objects relatively close to Hubble, or huge objects much farther away.
For example Hubble was used to study the dwarf planets in our solar system Pluto and Eris.
Hubble was also used to study galaxies BILLIONS of light years away. A light year is a measure of distance. It is the distance light travels in one year. Light travels 5,860,000,000,000 miles in one year, so Hubble can see galaxy sized objects billions of times a light year away.
The distance, however, is not the important part of that statement. The important part of the statement "billions of light years away" is "billions of years". Because Hubble can see so far it is, in fact, showing something NOW that happened billions of years ago. That is because the light had to travel for billions of years to reach Hubble. It is allowing astronomers and scientists to observe the universe as it was billions of years ago. This is producing a multitude of theories and scientific papers.
that pretty much covered everything i said except that hubble was last luanched to get to the begginning of time, it's a big gamble for sientists...
i don't even have to write more now :P
How much money is spent each year on the Hubble Space Telescope?
When the Spitzer Space Telescope was first designed, it was going to cost over two billion dollars. Due to some clever design and orbit changes the total cost has dropped to $720 million, which includes all costs from 1996 through launch and initial checkout, including early concept and feasibility studies.
Please visit the related link below for more.
What property of an optical telescope is associated with sharper images?
The sharpness of images in an optical telescope is often associated with its resolving power, which is determined by the size of the telescope's objective lens or mirror. A larger objective size allows the telescope to collect more light and resolve finer details in the observed objects.
What is the name for the pieces of shaped glass used to bend light in telescopes?
Those pieces of shaped glass are called lenses. Lenses are designed to refract or bend light in specific ways so that objects appear magnified or clearer in telescopes.
What is the approximate azimuth and elevation of Venus just before it sets?
Azimuth about 270 degrees. That's due West.
Elevation (or altitude) about 5 degrees. That's just above the horizon.
Venus is always fairly near the Sun in the sky. The Sun sets roughly in the West.
Amongst other things, the actual azimuth would depend on time of year and different latitude, of course.
I've used the convention for azimuth of North 0 or 360 degrees, West 270 degrees, South 180 degrees, East 90 degrees.
There are other conventions.
Where do most x-ray and uv telescopes work best?
Most ultraviolet rays, x-rays, and even gamma rays are absorbed by the Earth's atmosphere, inhibiting the use of telescopes in these wavelength regimes from the ground or even at high altitudes. Therefore space telescopes are generally used to study light at these wavelengths. The telescopes can be in circular Earth-orbit or even further out at the Earth/Sun lagrangian points where the telescope can stay relatively still for high resolution images. Some examples include the Chandra x-ray observatory, the Compton gamma ray observatory, the hubble space telescope (visible, infrared, and UV instruments), and the Spitzer space telescope (infrared).
What is the average cost of an X-ray telescope?
The average cost of an X-ray telescope can vary greatly depending on its size, complexity, and mission objectives. However, they typically range from tens of millions to hundreds of millions of dollars. For example, NASA's Chandra X-ray Observatory, launched in 1999, cost approximately $1.65 billion.
Which of the following greatly improves the angular resolution of radio maps?
Increasing the size of the radio telescope greatly improves the angular resolution of radio maps. This is due to the relationship between the size of the telescope and the wavelengths of the radio waves being observed.
When can you see the hubble space telesope from earth?
Yes. It's visible during the first couple of hours after sunset, and the first couple of hours before sunrise,
IF you know exactly when and where to look.
If you see it, it looks like a star moving quite slowly.
Take a look on < Heavens-Above.com > .
You put in your location, and the site tells you where and when several objects will be visible from your location.
The shortest on this list is gamma rays.
The list is stated almost but not quite in the correct order, from longest to shortest wavelength. It should read:
Radio
Infra-red
Ultraviolet
X-rays
Gamma rays
Where did Zacharias Jansen get his education?
Zacharias Jansen is believed to have received his education in the Netherlands. However, there is limited historical evidence available on his educational background.
Is Polaris almost at plus 90 degrees?
Yes, Polaris is very close to being at the celestial pole, which is approximately plus 90 degrees declination in the sky. It is used as a navigational aid for celestial navigation and is a good guide for finding true north in the Northern Hemisphere.
What is the origin of telescope?
The telescope was first invented in the Netherlands in the early 1600s, with Hans Lippershey often credited as the original inventor. However, there were also claims from other inventors like Zacharias Janssen and Jacob Metius around the same time. The telescope played a pivotal role in advancing astronomy and our understanding of the universe.
What is more important a microscope or a telescope?
according to me both are equally important. in science, smallest of the things hold a great importance. space science has always fasinated man and thus telescope is a wonderful discovery till today because scientists get to know more and more about this unknown world. microscopes are of great importance too, because we get to see the structures too small to be seen through naked eyes and we get to know about the complexity of our own body structure. so both are at equal post and both are equally important.
Which of the 88 constellations of stars will you never see viewing from 40 degrees N latitude?
One is The Southern Cross "Crux" which is the smallest of the constellations.
Why do astronomers send telescopes and probes into space?
people want to know the unknown things in the space like coloumbus's
exploration through the sea. they want to know about the aliens, who are belived to be living in some other planets,as our human behaviour is, featuring to know about the neighbours,and to the facilities and wealth of them ,this same feature made them to explore space.
Humankind has always been fascinated by what is beyond our world, but the satisfaction of this curiosity was only feasible when our technology was sufficiently advanced breach the hold of gravity, circa 1960. The deciding factor in this realization of said curiosity was the Cold War funding pumped into space programs by the United States and the Soviet Union in what was ultimately a pissing match between the two to prove who was superior.
The Submillimeter Array (SMA) is a radio interferometer located atop Maunakea in Hawaii. It consists of eight radio dishes that work together to observe celestial objects at submillimeter wavelengths. The SMA is used for studying a wide range of astronomical phenomena such as star formation, planet formation, and the chemical composition of interstellar space.
There were many inventors that had ideas and even drawn out ideas on building a telescopes that used mirrors instead of lenses, but here are a few:
- Galileo, Giovanni, and Francesco Sagredo (with others, talked about this idea)
- Cesare Caravaggi (reported to have built one)
- Niccolò Zucchi (again reported to have built one)
- James Gregory (most notable, but had no working models)
- Robert Hooke (built a working model)
- Isaac Newton (generally credited with constructing the first practical reflecting telescope)
Hence, most would credit Isaac Newton for building the first practical reflecting telescope.
How do you get the telescope off the rail on Club Penguin?
All you have to do is press the X button on the top right corner.
