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.

7,250 Questions
History of Maritime
War and Military History
Telescopes
Pirates

What was the pirates telescope called?

A spyglass

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Astronomy
Telescopes
Hubble Space Telescope

Why does the Hubble Telescope work better in space than on the Earth's surface?

We have an atmosphere that gets in the way. Pockets of air at different temperatures and different volumes act as lenses, just like those in the telescope itself, that bend the light and can do so rapidly. In fact, this bending of light is the cause of most UFO sightings. Given the properties of light, this bending can cause a change in shape and color of the object being observed and so can cause a lot of problems with useful data. Placing the telescope above the atmosphere (or in its uppermost reaches) allows the observer to bypass these issues.

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Science
Telescopes

What are the three different ways of stating a hypothesis?

A hypothesis can be one-tailed to identify a function in one of directions, or it can be two-tailed to idenitfy the funciton with 2 directions.
Start out with "IF" then follow with "then"

If I jump up then I will come back down.

Start out with "I think" then follow with "then"

I think that if we add red to white it will then become a lighter pink.

Those are really only two decent ways to state a hypothesis.
Hypothesis statement are from Wikipedia under types of hypothesis:

A causes B

A is related to B

If A then B

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Science
Astronomy
Telescopes

How can astronomers study space beyond Earth?

Astronomers use telescopes and launch robotic instruments as probes.

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Astronomy
Space Travel and Exploration
Telescopes
Hubble Space Telescope

What does the hubble telescope look like?

Go to the related link to see a huge collection of photos of the HST from various angles, as well as photos of astronauts working on it.

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Planetary Science
Telescopes

How many light years away can we see?

The furthest object we have observed, is a destructing star (GRB 090423) at 13.1 billion light years away.

This answer is only partially correct because humans can only see that distance with improvements on their eyes. For example a telescope. But humans originally can only see 2,300,000 to 12,000,000 light years into space with perfect vision & nothing to enhance their sight.

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Astronomy
Telescopes

Why do astronomy telescopes not have prisms?

Ah, but they do; in the spectrometers. Most telescopes do not use prisms, because a prism splits the light into a spectrum; in most telescopes, we want to focus the light into an image. Spectroscopes are a special case, but the Hubble Space Telescope does have a spectroscope aboard.

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Telescopes

Where was the first optical telescope built?

The Englishman, Leonard Digges (1520-1559), from Bartham in Kent, UK, invented the Theodolite in 1551...The main component of a Theodolite is a small but powerful refracting telescope, so he was almost certainly the very first person in the world to invent the refracting telescope. However, it is known that he also invented the reflecting telescope shortly afterwards. In 1608, Hans Lippershey, a German born Dutch citizen invented a refracting telescope in Middelburg, Netherlands. Galileo's model a year later was a considerable improvement upon Lippersheys design but it came almost 60 years after Digges's invented his telescope. The Gregorian reflecting telescope was invented by Scottish mathematician and astronomer James Gregory and his design was first published in 1663. Isaac Newton invented the Newtonian reflecting telescope in 1668, 117 years after Digges invented his. The design of the Cassegrain telescope was first published on April 25th 1672 and its invention is attributed to Laurent Cassegrain (1629-1693), a Catholic priest from Chartres, France. There were no real major advances in telescope designs until the Schmidt telescope was invented, by German optician Bernhard Schmidt, in 1930. The Maksutov telescope was patented in 1941 by Russian optician Dmitri Maksutov.

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Physics
Telescopes

Do hand lens refract light?

Yes, hand lens reflect light.

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Telescopes
Astronomy

How does a telescope help you see the stars better?

It is like having bigger eyes... The bigger a telescope's main lens, or main mirror, the bigger will be (a) its light-gathering capacity, and (b) its resolution. For simplicity, just consider our eyes as a "small telescope", and compare the size.

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Planet Mercury
Telescopes

Is Mercury mostly gas or mostly rock?

Mercury is mostly rock

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Car Electronics and Lights
Postage and Shipping
Telescopes

Problems with infrared telescope technology?

There are a few problems with infrared telescope technology such as, infrared wavelengths are absorbed by water vapor in earth's atmosphere and infrared telescopes must be kept cool. Astronomers have to place infrared telescopes on high mountains above the clouds so that the wavelengths aren't absorbed by the water vapor. Since infrared energy is heat energy, it's hard to keep the telescopes cool. If an infrared telescope is not kept cool it may detect itself and won't pick up on weak infrared sources out in space.

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Telescopes
Radio

How is the VLA similar to an optical telescope?

well,both telescopes let you look into the ground into the inner core and you see deep in he atmosphere which is space.

Errr...

The Very Large Array is an array of radio-telescopes, i.e. it detects radio emissions from stars and similar.

An optical telescope as its name suggests, collects visible light.

The similarity is that increasing the aperture increases the radiation-gathering power by a square-law.

In an optical telescope this is achieved by a larger mirror (or lens but most large telescopes are reflecting.)

The VLA uses a "synthetic aperture" to gain the advantages of increasing its gathering area without the cost and complexity of building a single, very large dish.

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Astronomy
Telescopes
Radio

When multiple radio telescopes are used for interferometry resolving power is most improved by increasing?

Increasing the distance between the two most widely separated radio telescopes has an enormous effect on resolution.

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Telescopes
Isaac Newton

Why did Isaac Newton invent the reflecting telescope?

== == Newton did not invent the reflecting telescope. The first reflecting telescope is credited to Niccolò Zucchi in 1616. In 1668, Isaac Newton made significant improvements to the design resulting in a much improved reflecting telescope that still bears his name, the "Newtonian reflector." He did it because the refracting (lens) telescopes of the day suffered severe color aberration. (Different focal lengths of different colours of light resulting in a blurred image because all the colours can't be brought into focus at the same time.) Reflecting telescopes do not suffer from color aberation and Newton's improvements made them effective observing instruments. Although the colour aberration of refractors was partially solved by the invention of the achromatic lens in 1733 Newton's design remains in use to this day.

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Telescopes

Who was the first ancient astronomer to use the telescope?

Galileo was the first ancient astronomer to use a telescope.

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Astronomy
History of Science
Telescopes
Science Experiments

Why did Johannes Kepler change the world?

He didn't change the world. He DID discover that the orbits of the planets around the Sun are ellipses rather than circles, and went a fair way to discovering the nature of gravity. Without Kepler's work, Newton would probably not have been able to "discover" how gravity operates.

In reference to Kepler, Newton once wrote "If I have seen further than other men, it has been because I stand on the shoulders of giants."

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Astronomy
Telescopes

What wavelength does the Chandra telescope use to examine outer space?

The Chandra Telescope uses x-rays to examine outer space.

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Telescopes
Earth Sciences

Who discovered the Earth?

Nobody "discovered" earth, in the sense that European Explorers were said to have "discovered" The Americas and Australasia.

Planet Earth formed over 4 billion years ago and life first formed about 1 billion years later.

The first Human life as we understand it today originated about 200,000 years ago so it could be said that those early humans "discovered" the planet. Regrettably, there is no record of any of their names.
Every being discovers Earth in a manner unique to them. In particular, the Earth known to the Birds differs from that known to the Fish, and different again from that known to most Land Animals.

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Science
Astronomy
Telescopes

Why isn't necessary for radio telescopes surface to be as smooth as mirrors?

It doesn't because radio waves are longer than optical waves.

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Astronomy
Telescopes

How much more light gathering power would a telescope with a 50 cm objective lens have than a telescope with a 25cm objective lens?

"Light gathering power" is simply the result of the area of the lens, and the area

is proportional to the square of the diameter. So the one with twice the diameter

has 4 times the light gathering power.

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Planetary Science
Planet Jupiter
Telescopes

Which planet has the great red spot?

The answer is Jupiter.
That would be Jupiter. The spot is a hurricane, more than three times the size of Earth, which has been raging for at least 400 years.
Jupiter

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Astronomy
Telescopes

What is a computerized telescope?

It is a telescope with a mount that has a GoTo system in it. It is like a small computer that you put in what object you want to see (eg. The Orion nebula) and then the telescope points at the object

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Telescopes
Poptropica

How do you use the Telescope on Shrink Ray Island?

You put in x-coordinate 89 and y-coordinate 16.

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Astronomy
Telescopes

What are the uses for a reflector telescope?

A small reflector telescope usually is less useful than a small refractive telescope, especially when there is plenty of light, but when one needs a large telescope and there is not much light, then the reflector telescope can be made much lighter than the refractor and usually much larger. It also can gather more light which is very useful in astronomy.

It also does not have to pass its light through thick large lenses that absorb part of the light. What is more, it can reflect almost any kind of light, from microwave radio to ultraviolet, while it is difficult to make lenses for large refractor telescopes that do not absorb some kinds of light such as infrared and ultra violet.

There also are advantages when one wants to see in more than one wavelength (colour) of light. It is difficult to prevent the different colours from separating out when passing through a large lens, but a reflector telescope does not have this problem much.

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