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Large telescopes are needed to collect the weak radiation, coming from faint or very distant sources. The larger the aperture, the brighter the final image will be.

The aperture also has to be much larger than the wave length of the radiation being observed otherwise diffraction will spread the star light out and the image will be blurred not sharp. Radio waves have a very large wave length, so these telescopes are enormous!

The resolving power of a telescope measures how well it can distinguish stars that appear close together. It depends on both the aperture size and the wavelength used.

Aperture=light-gathering area of the telescope.

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14y ago
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12y ago

The reason people build larger Telescopes is because smaller telescopes have a smaller power to them, which results in less detail the farther they look. Larger telescopes use much larger lenses to see much farth and with much more clarity.

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9y ago

There are basically two main reasons.

1) To gather more light - letting you see more faint objects, such as far-away stars.

2) To improve the telescope's resolution, letting you see more details.

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12y ago

Larger telescopes can see fainter objects in space, thus adding to astronomical knowledge.

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12y ago

Because they can capture more light and give a better view of things that they are looking at.

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13y ago

Yes in fact there are many

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Q: What is the the primary reason for making telescopes very large?
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Related questions

The primary reason for spreading many radio telescopes across a large area and combining the signals at a central station is?

To have better resolving power, and a much clearer image.


Why have no large refracting telescopes been built since 1900?

Refracting telescopes suffer from chromatic aberration, refracting telescopes have several surfaces to shape and polish, making large glass lenses without interior defects is very difficult, and large glass lenses are more difficult to support than large mirrors.


What is the main reason for positioning many radio telescopes across a large area?

To produce higher resolution images.


What and where are the largest optical telescopes in use today?

Ccd's and in large telescopes


What are three primary contributions to Astronomy?

Galileo's desktop telescope, Edwin Hubble's Galaxy Tracker, and Radio Telescopes -as in The Very Large Telescopic Array - the VLTA.


Reflecting telescopes differ from refracting telescopes in having what?

Two large objective lenses.


Why big telescopes?

Large telescopes have improved resolution over small telescopes and as such can gather clearer images of objects further away.


Are telescopes dangerous?

Telescopes are not dangerous in normal operation. A large telescope might hurt you if it fell on you.


Why are large telescopes made?

to see uranus


Why are large telescopes used to study distant galaxies and not small telescopes?

my guess is that larger telescopes are stronger than smaller ones. which means they can see farther. .


Large telescopes are often housed where?

On top of mountains.


What does a major factor mean?

A major factor is a primary cause, a large reason why something happens.