Telescope Definition and 517 Threads

I understand that a radio telescope can be tuned to receive radio waves generated by neutral hydrogen atoms present in galactic gas, for example, within the spirals of the milky way. I think I understand that the incoming radio waves will be a mixture of red- and blue-shifted photons depending...

Hi, I just managed to take my best picture up to this time of the Moon through my crappy $35 scope. Professionals would have cried if they looked at my setup :biggrin:: a Chinese $35 telescope a really (REALLY) unstable mount a mobile phone camera held up by hand in front of the eyepiece, set...

I've had a refractor telescope and I've managed to get some okay photos of them moon and jupiter. The only thing it lacked however was a tracking system. I would really like to buy a low maintence telescope that has a straightforward tracking system I can use to take pictures of things such as...

This paper; https://arxiv.org/abs/1806.02481, The Thirty Meter Telescope International Observatory facilitating transformative astrophysical science, provides an update on plans for the thirty meter telescope. This monstrosity is to be built next door to the Keck in Hawaii and is slated for...

I was studyng my exam of astrophysics laboratory, while treathing the optical aberration I've wondered: does radio telescope have aberration? Is a paraboloid antenna in a single dish affected by coma? and the radio telescope made by arrays of resonant structures? Maybe those are silly...

If I understand the phenomenon correctly; whenever we capture an image using a telescope, because the light that's emitted from a distance object acts like a wave, we notice a diffraction pattern in our image. Now, in the double slit experiment (I didn't create the image, excuse the "slot"...

Hi, I am going into the field of astrophysics and I am going to make my career a hobby, too. I want to buy a telescope that can measure the spectrum with CCD (astronomical spectroscopy) in a range of several hundreds of light years (like the Big Dipper). Does anyone know where can I get it...

Homework Statement The star Betelgeuse is 427 lightyears from earth. Betelgeuse has a diameter 800 times that of the sun, where the diameter of the sun equals ##1.39*10^6 km##. Given that Betelgeuse has an angular resolution given by the Rayleigh Criterion of 58 nRad, is it possible for the...

I just bought this it will be my first telescope. I won't post the link to the website but I'll post the name and description of the telescope :) INTEY Ultra-Clear Telescope Christmas Gift Portable Astronomy Telescope Entry-level Telescope for Astronomers and Children (with an Additional...

Is there a programmable telescope that will point to any spot on Earth from my location that I could simply plug in the latitude and longitude and it would point at the location anywhere on Earth. For instance, if I wanted it to point at the LHC (Large Hadron Collider), could I just plug in the...

I want to make my own scope dew heaters, I have 8 meters of nichrome band, with 1,82 ohm/meter resistance. How do I calculate the length for a specific temperature (around 8 Celsius over ambient) and how to wrap it i.e. in a coil or in a series of parallel 320° circles? The circumference of the...

I am currently working on writing an ML program that predicts star formation rate of a galaxy given the magnitude of filtered color bands (ugriz). I have a simulated data which contains these info to train on but if I want to use this on an observable galaxy, I'd need to physically obtain the...

How much more refined are the various variables of the Drake Equation in view of the recent findings by the Kepler Telescope? I imagine fp and ne would surely be better estimates. Is there a study on this anywhere?

I was wondering if it is possible to use only a stopwatch and a telescope to find the mass of a planet, such as Saturn. I've experimented with a couple of things but I keep running into problems. I previously asked this question in the homework section, but it does not involve numbers, is not...

My star pictures are improving and I am at the next stage of needing some money. My tracking seems to be limiting my exposure times to only a couple of minutes and there is a hint of star trails. So I need to do some auto guiding. I have been doing some homework. In the systems I have seen...

Greg Bernhardt submitted a new PF Insights post Getting Started with Solar System Imaging Continue reading the Original PF Insights Post.

Will a telescope work if its front lens (Objective lens) is replaced with a pinhole ? What if both lenses ( Objective and eyepiece) are replaced with pin holes ?

Hi there, I love physics and I'd like to begin a bit of astronomy. I want to invest in a beginners telescope but I haven't a clue about what to buy. Some that I'm looking at are linked here: https://www.amazon.com/dp/B00XQMLA7Q/?tag=pfamazon01-20...

Hello PF community! Quick introduction: I'm a fresh-out-university mechanical engineer working on a telescope altitude-azimuth mount hobby project. The mount will be designed using rotary platforms (powered by internal motors) to move the mount structure in the altitude and azimuth directions...

Hello, I made some photos of Vega..just by mobile camera through telescope 130 mm eyepiece 12,5 mm. Fig. "vega_cam" is made by usb camera eyepiece adapter but I did not manage to focus it properly..

Greetings to all stargazers! I am a happy owner of a Newtonian telescope 200/1200 on Dobson mount, more detailed specifications on this link (http://skywatcher.com/product/dob-8-traditional/). It has a 2” focuser with a 1.25” adapter. So far, I was using only the two included eyepieces, 1.25”...

Could this be a possibility at some point? Since entanglement is not affected by distance, could we send cameras out to extremely distant places and get instantaneous signals? Only the image sensor would have to be entangled. It would still take the same amount of time as usual to get the camera...

Hello, I just try to make photo (quite amateur) of Vega and Arcturus (by 76 mm scope Newtonian) If you like watch it ...

Hello, term quantum telescope is usually related to beating diffraction limit as described for example there. But my question is not related to it. Recently I have read paper about Counterfactual quantum communication. If this really works and someone is sending quantum engaged particles to our...

Hello! I want to buy a telescope so I can get into astronomy but I have no idea what to look for. I done a bit of research but none of it has been very helpful :(. My budget is a maximum of £100. Does anyone know some good beginner telescopes I could get? I'm also interested in astro-photography...

Hello, I am writing a (mock) proposal for gaining some observation time on a telescope. One part that I am having a hard time with is, what considerations are made when deciding how large a field to survey? Are astronomers primarily constrained by the amount of time they are likely to be...

I purchased a 6" mirror reflector telescope, but no matter how much I tried to get good photos all came out blurry, I'm guessing the mirror was low quality, also the tracking system made absolutely no sense and could not even find the Moon. Not just that but it wasn't stable either. So...

I've read that Hubble is in geosynchronous orbit, but precisely what point on Earth does it remain in orbit over?

Hello, I am currently considering on buying a telescope to do some of my own research and for sight seeing. Any recommendations? I would prefer to have a telescope that requires me to use code or at least a computer so I can familiarize myself with the mechanics.

Homework Statement I am asked to draw the ray diagram for an incident plane wave whose rays are at an angle α with respect to the optical axis of the telescope. I have done this, but I need to find an expression for the angle between the outgoing rays and the optical axis, in terms of f1, f2...

So, my SPS group is building an optical and a radio telescope (using a typical TV dish). The trouble is, these are merely for showing kids and sometimes for us to just see the sky. Because of their small size, we won't be able to do a lot of research. What I need is a telescope like the...

https://en.m.wikipedia.org/wiki/File:Moon_egret.jpg Can we use better telescopes of this type (ground based gamma rays telescopes) to image the surface and subsurface of a planet with a lot of resolution?

The Physics group at my university is building an optical telescope (it will have a dome the size of an 8mX4m room and the mirror will have a diameter of about 65cm.) and we might also build a radio telescope or an array of telescopes which will work as one giant telescope. Also, I heard that we...

I'm confused about the theory of the telescope I am making. My questions are: 1. Magnification - according to my image we should see magnification because the image we see is the image formed by the continuation of the dotted lines. Is that true? 2. Why do we need lenses with different size? If...

Astronomers are viewing a single point in space (.1 arcseconds), using the Kepler space telescope but to view a planet 4.2 light years from the Earth that would require a planet with a diameter of more than ten times the diameter of our solar system.

I happened to find this site looking for a telescope. I am a newbie to telescopes. I had a cheap department store telescope about 30 years ago.I am looking for a telescope I can connect to a PC and displays on the screen for the purpose of making it easier for me and my 6 and 7 year old...

I am currently in the middle of constructing a Newtonian reflecting telescope and I had a question. The focal length for my primary mirror is 1500mm and 3mm for my eyepiece. My question relates to the path of the light inside the tube of a telescope. I understand that in a Newtonian reflector...

Hello PF, I was wondering if there is any good guide to build a radio telescope that can give me an image not just a graph. I am just a starter so any advice or tips are relly appreciated.

its commonly stated that no particle accelerator will ever be built that can probe the Planck scale. what about an can an event horizon telescope observe quantum gravity effects near a black hole, such as Sagittarius A* do the various candidates of QG such as string theory LQG asf gravity...

Hello all, First of all thanks for taking the time to look at my post, and thanks ahead of time to those willing to answer my question. I've always loved Astronomy and have done quite a bit of self-study over the years. I have a pair of binoculars but want to get a telescope. I'll start by...

A recent short-lived member got me thinking about the issue of telescope vs binoculars for a first stargazing device again after a few years of the issue sitting dormant. I hadn't participated in the particular necroresurrected thread, so it didn't have my take on the issue. Here it is: It...

World's largest radiotelescope just completed. http://news.xinhuanet.com/english/2016-07/03/c_135485643.htm

Hi! :) I have this question regarding delayed choice quantum eraser - If my understanding is correct then interference pattern will form/not form based on whether there is erasing mirror in path of entangled particle - regardless of time when particle arrive at mirror. Should not it be...

Time-lapse video of two dozen engineers and technicians successfully installing the package of science instruments of the James Webb Space Telescope into the telescope structure.

I came to know that the PACS instrument of HERSHEL has a resolution of 5" at a scan speed of 20''/sec whereas it's 10'' at 60''/sec. The resolution has almost doubled with the scan speed. Can you please tell me why it's so?

I bough a Newtonian reflector a while back, after it was assembled I couldn't see anything through the eyepiece. The viewfinder works perfectly fine, but when I look through the eyepiece it is just pitch black. Any suggestions?

A telescopes sensitivity, or how much detail it can see is directly related to the size of the mirror area that collects light from the objects being observed. So a bigger mirror means higher resolution so you can see more detail at greater distances right? does it also mean it can collect more...

I'm not talking about the well known, miss-grinding of the main mirror which was corrected long ago . This picture illustrates well , my beef with the current images ... Every image of every star has four streaks of light , this is not so noticeable in pictures of galaxies where the stars...

Hi everyone, I am working on a project on my final project in Product design. The project is about translating digital concept into the analogue world. In my project I am especially interested in the digital “Windows” and am trying to apply the functions and possibilities of digital on to...

Homework Statement A telescope has a focal ratio of f/7.5. You wish to use it with a spectrometer that requires a f/10 beam as its input. Compute the focal length of a 50mm diameter lens that, when inserted into the beam 150mm in front of the unmodified focal plane, produces the required beam...