Telescope Definition and 506 Threads

Suppose there is a set of twenty tiny radio sources that are distributed randomly in an area of 1 mm2. What is the best way to locate each of these sources - as in identify them and their locations? We can suppose that all of them are of the same frequency of 1 Mhz. Thus if the radio telescope...

... The other night my telescope buddy and I were discussing gravities vs time over a campfire and beverages. I mentioned that a clock on the moon should run faster than an identical clock on Earth because the gravity is weaker there. As an example, if we synchronized another rather large...

Hi. I'm at a very critical point in my life / education. In 3 months I have to apply to the university I will attend next summer. I'm torn between studying physics or biology - I have had biology for 6 months, physics only for 1 week in my whole life. But I've been interested in astronomy since...

I'm unable to see any stars or anything in general besides the moon when looking at the sky. This might be due to the light pollution as the actual pollution levels is very low. Is it worth buying a telescope here? Will I even be able to see anything in the sky like Mars or anything similiar...

Common sense really. Space is full of CBR (not to mention other radiation and matter). They keep being fed. The surrounding CBR is warmer than the Hawking temperature of the hole and in effect blocks the Hawking radiation process. Ellis et al even calculate far into the future when the CBR is...

Hello everybody. I'm Mike(Subchillin), I'm very new here and terrebly interested in ALL things Cryo. And I'd like to start by expressing gratitude to the creators of this amazing forum and all the active members, because simply knowing that there is an active online community of people who love...

What exactly does it take to figure out the orbital parameters or planets and what's the Math behind it? Can it be done using only a telescope or is it necessary to send a probe?

I'm asking this just out of curiosity on my part.<grin> When I first heard of cosmic inflation, a long time ago, I went to the local university library to look at papers that made estimates of the total number of e-folds from various models. I'm not an expert in any area of science but I found...

Hi, I am a recent high school graduate, and my whole life I have been interested in astronomy. I have always stared in marvel at the night skies and read various books about constellations, etc. When my parents bought a telescope, that only spiked my interest further! I have, also, gained an...

Hello, I have access to a pretty big telescope, at least when compared to others I've played with. I'm itching to set it up but the mirror is not in great shape. It has been in storage for a long time and there looks to be some corrosion. I was wondering if there is anything I need to be...

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Definition/Summary A conic section (or conic) is any curve which results from a plane slicing through an upright circular cone. If the slope of the plane is zero, it cuts only one half of the cone, and the conic is a circle (or a point, if the plane goes through the apex of the cone). If the...

Hi, I would be really grateful if someone could help me with two questions I have, both have puzzled me on and off for years. I have read what I can regarding these points, but a lot of it I don't understand (the maths specifically). I would love it is someone who understands this more than...

The IAU plans to name 305 exoplanets. Currently, organizations can make suggestions, in 2015 the public can vote on those suggestions. This is organized on nameexoworlds.org (IAU press release) While a proper name is certainly nicer than "HD 121504 b", it won't be an easy task to keep up...

If the satellites are spread out as a big baseline telescope? Or there are other problems that even that method can't solve when watching the ground?

I saw on Nova thst large telescope mirrors have aluminum reflective coatings. Wouldn't that rapidly become an aluminum oxide costing? Are the coatings coated to keep oxygen out?

Homework Statement A telescope consists of a mirror with radius of curvature 14.0 m and an eyepiece of focal length 19.0 cm. Approximately what is the value of its angular magnification I haven't yet been asked to find angular magnification given such little detail, my cyber-school program...

dear sir i want to know what happens in certain stars that helps it give out radio wave we detect by radio telescope. can we compare with inductor in electronic circuit?

Bill was a fellow Australian and prolific comet hunter and discoverer Quoted from the Ice In Space site He will be truly missed in the astronomical community :( Regards Dave

Homework Statement Hardware redundancy is important in many real-world engineering systems. Specifically, installing multiple sensors that measure the same quantity provides a level of safety in the event that one instrument fails during the mission lifetime. You do not want an expensive...

==from conclusions section on page 4 of Barrau Linsefors June paper== V. REBIRTH OF THE UNIVERSE AND TESTS OF THE MODEL In the far future, huge patches of our universe, with radii larger than the Hubble scale, will be completely empty. They will be pure dS spaces. If the model suggested in this...

Homework Statement Suppose that you wish to construct a telescope that can resolve features 7.0 km across on the Moon, 384,000 km away. You have a 2.2 m-focal-length objective lens whose diameter is 10.5 cm. What focal-length eyepiece is needed if your eye can resolve objects 0.10 mm apart...

Homework Statement Suppose that you wish to construct a telescope that can resolve features 7.0 km across on the Moon, 384,000 km away. You have a 2.2 m-focal-length objective lens whose diameter is 10.5 cm. What focal-length eyepiece is needed if your eye can resolve objects 0.10 mm apart...

For my science fair, I need to take measurments (to scale) on a telescope, for example, I need to be able to point it towards the moon, and measure its radius. Now, my problem there is how will I measure this? Since my eye will be in the way, I can't use a ruler to find a crude measurement, so I...

Today I was bored, so I went into my closet and found an old telescope of mine. I spent like a half hour star-gazing, but quickly became bored. I couldn't see very far with this telescope, since it was a cheap one I got for Christmas a few years ago (and funny thing is, around the time I got it...

Homework Statement You have been tasked with the design of a new far-field, high resolution imaging system to be placed on the Hubble Space Telescope. This system will be used for taking deep space astronomical images with an exposure adjustable between 10 minutes and 24 hours based on the...

:biggrin: I need a telescope for my astronomy class next semester :biggrin::biggrin::biggrin: and a $700 budget...having a difficult time deciding which one to get :-/

Hello everyone! I bought a Spectra Optics telescope 1400X150 (reflector) for 260 Euro a few days ago and I had quite big expectations on it. The including oculars was on 25mm and 6.5 mm. But when I was going to look at Jupiter recently, then I didn't get a more visible view than a little dot and...

The telescope magnification is given by the measure of the resolution power of the eye divided by the resolution power of the objetive lens. I just want to know why a magnification can be defined as the ratio of these two kinds of resolution, I need a...

Does anybody know of a good reference for determining the required diameter of an Earth observing telescope's primary mirror? I am trying to find determine a rough estimate for a design I am working on. So far I have found the equation Sin\theta = 1.220 \lambda/D for angular resolution and...

Homework Statement A telescope contains 3 large mirrors. The time (in years) until a single mirror fails has been investigated and we know that the probability that a mirror is still fully functional after t years is e^(-(t/10)^5 ) a) All mirrors must be working to take the most detailed...

https://www.youtube.com/watch?v=wFpeM3fxJoQ VLT (Very Large Telescope) [/Color]

Any suggestions on vendors for good, well-designed reflecting telescope mirror holding cells, in the ~ 8" diameter range? I've had enough grief from the very poorly-designed cell that holds the primary in my 7" Mak-Newtonian, and am looking to toss it and replace it with something better. Tube...

Hi, I'm pretty new at this amateur astronomy thing, and I saw something through my telescope that I could not focus clearly enough on (as to be expected from a telescope I picked up from craigslist for $10). I would like help identifying it. Latitude: 40° 15' 36" N Longitude: 74° 16' 27" W...

can anyone please give me any resource for building a reflecting telescope (and also the underlying principles) (sorry if it's not the right place to ask)

Hi everyone. I am a research undergrad student at the University of Washington and I have been given a conceptual problem to figure out for my astrophysics group... My professor would like us to explain to how how one would find the point spread function of a Newtonian telescope. Here's...

Hey, not sure if this is the correct forum but it seems physics will ultimately bring down the telescope. Why can't we leave the Hubble in space until it doesn't work anymore? It doesn't have any space crew to kill, it would break up on re-entree harming no-one and would continue to inspire our...

For some years I have had an orion skyquest 4.5 inch reflecting telescope that I received as a gift some years ago. I have recently gotten back into astronomy and have discovered that my current telescope isn't quite as powerful as I would like. Does anyone know what size mirror would be...

Or it might as well be, the result would be the same. Dennis Overbye in the NY Times: [SIZE="4"]http://www.nytimes.com/2011/07/07/science/07webb.html" According to this article (found on http://en.wikipedia.org/wiki/James_Webb_Space_Telescope" ), the project cost ballooned from $1.6 billion to...

i just had an argument with a friend regarding the working of a telescope.Could you please help me out with it. ok the thing is that i say that the light of an object reaches the telescope then we r able to see that object which means that if we r lookin to an object which is 100 light years...

While making a projection of the sun on a paper with a Newton telescope, I’m able to see a white ball or to make burning holes in paper. My idea however is to be able to see something more spectacular , like sunspots or protuberances. Does someone has an ideas how to do this practically...

I have a question about the colored filters used for the telescopes. Here I will give an example for the filters of the big telescopes, but I assume that it applies also to the smaller personal telescopes. The range of the visible light goes from about 400nm to about 750 nm. Where the "blue"...

Hi, In research, if you want to observe a certain galaxy or cluster, how do you decide to which big telescope to apply (in terms of aperture), how do you know what aperture you need for a certain project? Thanks!

Homework Statement A convex lens forms an image 8.96 mm on a screen. Keeping the screenand the object fixed, the lens is moved through a distance of 15.4 cm and a sharp image of the object is again observed on the screen. If the length of the second image is 3.54 cm, calculate the focal length...

hi I am an astronomy nooby and i am trying to find saturn in my telescope, i don't know what seasons it is visible in, can someone help :D?

I"m wondering what is the advantage of a binocular as opposed to a single mirror telescope. I know that the advantage is supposed to be in terms of angular resolution, but I don't understand what that means and how to use this. If I look at the Wikipedia page on Astronomical interferometer, I...

the energy output of a star is such at the surface of the Earth it provides 5x10^-19 WM^-2 in the visible part of the spectrum... how many photons are collected per second by a 500mm diameter telescope? i don't know if there's any definite formula to drive the answer...but i tried this way...

Homework Statement A person uses a re-flecting telescope of dia= 20 cm and f=170 cm to observe light of λ = 600 nm from a star. (a) find minimum angular resolution can he get? ° (b) find the diameter of the Airy disk? µm (c) find the minimum separation distance of two objects on...

OK - Here's a challenge. Our school has a theodolite; its telescope worked in the past. Now it suddenly won't focus beyond 7', though it gives a great image of objects between roughly 3'-7' away. The focus knob seems to move freely. My thought is that the eyepiece optics somehow got...

What do you suppose would be the limiting resolving power of this telescope system? Assume it's built on Earth or nearby with money no object. Could it, for instance, detect a butterfly flitting about on a planet 100 LY from us? If not, what are the limiting factors? Thanks!