Questions tagged [telescope]

Questions related to the physical instruments for astronomical observations.

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128 views

Why would astronomers want to eclipse the Sun?

I've heard that some astronomers are building an artifical solar-eclipse ship, that should help us to dim the diffraction of the Sun. Why don't we just wait till night? What is the function of the ...
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1answer
127 views

Identify this 2 axis motorized tripod

I am NOT an astronomy person, so this may be a dumb question, however I have recently found a tripod that appears to be for star tracking as far as I can guess. I would like to know the type of tripod ...
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How close would a Sunlike star have to be in order to be dangerous to look at it through a spyglass?

Alpha Centauri A which has an about 50% higher luminosity than the Sun is obviously undangerous to look at through a handheld telescope, at about 4.4 ly distance. How close would a yellow dwarf have ...
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101 views

Seeking advice regarding buying a telescope

I'd like to buy a telescope with a focal length of 700mm and an aperture of 60mm. Would I be able to use a telescope of this power to study the closer planets (for example Mars and Venus) and ...
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1answer
187 views

Which telescope should I buy? [closed]

I'm wondering which telescope I should buy, by the way, I'm new to astronomy and if you know any others that are under $100, It'd be appreciated. You don't need to take the price difference into ...
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108 views

Where do I find a better mirror? [closed]

I recently bought a telescope, but it doesn't have a very clear image. Where can I buy a better mirror?
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56 views

Safety while using a telescope to view a total solar eclipse

I have an 8-inch reflector telescope and a solar filter that goes on the front aperture to view the Sun (most recently to view the transit of Mercury). If I were to use this telescope during a total ...
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71 views

How can I determine if a typical low-end telescope is a refractor or reflector?

Is there a way to distinguish (with no manual, product info etc)?
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110 views

Does anybody recognize this kind of prism?

Supplemental to this answer to Did Edmund Scientific 4¼ inch Newtonians have 90° prisms as secondary mirrors in the 1970's? I was poking around a bit further and ran across this "1960's Edmund ...
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381 views

Type of telescope on Star Trek

In the first episode of Star Trek: Discovery, we learn that Captain Georgiou has an old-fashioned telescope in her ready room. Michael Burnham inherits it a bit later in the season. I wonder if anyone ...
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2answers
126 views

Need help with telescope mount; stars have tails

If I take a shot longer than 20 seconds, the stars get a tail. I have a Celestron Advanced GT mount with starshoot autoguide scope. I use a cannon can on a 9" Celestron scope. I can't get a picture ...
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86 views

Which telescope to choose and some general questions [duplicate]

I'm playing with the idea to buy a telescope for years now and finally decided to do so. There are two which I consider: The Celestron NexStar 127 SLT Mak and the Celestron NexStar 130 SLT I ...
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169 views

Possible to make a cheap reflective objective lens with a mirror?

Sounds kinda crazy and cheap but has anyone ever tried to take a flexible (plastic) mirror and attach a string to the back side then pull the string so it makes a concave surface? I realize it wouldn'...
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1answer
144 views

Missing piece in my telescope!

I purchased a National Geographic 76/700 EQ telescope and there was a piece missing. I'm wondering if it's needed or if I should return it, if you could also tell me what it does that'd be great. ...
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752 views

How do I align my finder scope National Geographic 76/700 EQ

Telescope : National Geographic 76/700 EQ I tried aiming my telescope at the moon but I just couldn't do it, it was so hard to do, my finder scope isn't helping at all and I watched a bunch of ...
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1answer
162 views

Counter weight rod

Someone gave me an Orion StarBlast 4.5 EQ, and with it everything but the counterweight shaft. Because of this, the telescope is hard to use. It flops around quite a bit making viewing of objects ...
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92 views

How should I find a telescope for research time?

I'm an undergrad in physics and astronomy deciding to look into applying for time on a research telescope, and I'm not sure how to proceed with locating/finding telescopes that I can apply for time on....
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828 views

Cannot calibrate “upgraded starpointer finderscope” for Celestron AstroMaster 114EQ

My wife just bought me an AstroMaster 114EQ which came with an "upgraded starpointer finderscope" -- it looks different than the one depicted in that link. I have tried following the instructions in ...
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974 views

Question about mars polar caps

I want to see Mars polar caps by myself. Is it feasible to make a picture of mars like this at home or to achive this very expensive telescope is required? P.S. Maybe someone can give me a link, ...
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1answer
210 views

How do I see Deep Sky Objects in my telescope? [duplicate]

I just bought a new telescope. I tried it out, and I even woke up at 3am when the moon set so there was light pollution. I have an 8 inch dobsonian telescope with a focal length of 1200 mm. For some ...
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44 views

Which one is better for both the beginner dad and the 7-yr old? Sky-Watcher 130P or Celestron StarSense Explorer 114AZ

I am looking for a beginner scope for myself and my 7-yr old. She has been asking for a telescope for some time but I don't know how immersed she would be, once bought. So, I want something which can ...
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26 views

How exactly does NEOSTEL's fly's eye telescope's secondary mirror array split the primary beam among sixteen cameras?

Wikipedia's NEOSTEL says: The Near Earth Object Survey TELescope (NEOSTEL - also known as "Flyeye") is an astronomical survey and early-warning system for detecting near-Earth objects sized ...
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Database capable of determining or predicting tumble of space debris

The tumble of space debris will need to be understood before large scale, active debris removal missions can be carried out. Tumble is really hard to precisely determine because most debris has lost ...
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Celestron Inspire 80az

I am new to stargazing, so I am unsure of what I am doing. I have an Inspire 80az telescope and 20mm and 10mm lens. I can view the moon really well but would like to view more planets, so I want to ...
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148 views

How to make a 65 cm lens with a 20 cm hole in it for a Hamiltonian telescope?

This answer to What (the heck) is a Hamiltonian telescope? Is this one? confirms that the telescope in the question linked there is indeed as described and that the first lens is a full 65 cm aperture ...
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1answer
52 views

mirror image of the earth in the past [duplicate]

For example, if there was an object somewhere in the room, say 100 light years away, which would have to be very large and have the surface of a mirror, you could theoretically point the telescope at ...
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68 views

What to observe with a remote telescope close to sunrise time?

I have an access to a remote telescope at 05.15-05.45 am at Hawaii time. The sun rises at 06.15 am. I will use this telescope for educational purposes for high school students. I wonder 30 mins is ...
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400 views

Planets not visible

I have recently purchased an Orion AstroView 90mm Equatorial Refractor telescope, also this is my first time having a telescope. The telescope came with a 25mm and a 10mm eyepiece, I also bought a ...
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1answer
122 views

Communicating with distant planet with life possibility

So, telescopes are like time machines. If we get an image and data for analysis from a planet say 1000 light years away, we are essentially looking 1000 years back in time. Now, if we notice presence ...
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1answer
1k views

I am beginner here.Could any one please suggest telescope on AliExpress [closed]

I am beginner and eager to buy telescope for viewing planets and deep sky objects. I have gone though several posts here and found that only magnification is not so important but along magnification ...
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159 views

Looking at ourselves with a powerful telescope?

Could a small curved mirror and/or lens in Earth's orbit be aimed at a different hemisphere from where you are be be viewed with a powerful telescope to see the ground through the mirror? Would a more ...
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1answer
121 views

About bigger resolution of telescopes [closed]

Any idea about the design of new better telescope having small length of diameter and having more resolving power.
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618 views

What is the magnification of the Keck telescopes in Hawaii? [closed]

What is the powers the telescope is used at?
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131 views

Telescope/s functioning from underground mines

Theoretically and Practically, Can a Telescope function for the astronomer observed from underground mines? By "telescope" I mean the instrument used by astronomers to observe stars, planets ...
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Why does the Southern hemisphere seem to be short of radio telescopes? [closed]

In northern hemisphere, we have GBT, Arecibo, Parkes, Jodrell and VLA, while in southern hemisphere, only Australia has big radio telescopes. ALMA is in Chile, but it is in sub-mm. Is not ...

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