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# Questions tagged [angular-resolution]

Questions about the ability of any image-forming device to distinguish small details of an object.

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### Just wondering if anybody knows how to do this question about angular resolution of the human eye?

Estimate the angular resolution of the human eye at the centre of the visible wavelength range during daylight. Using your answer, estimate the surface den- sity of rods (per mm2) on the retina, ...
• 37
1 vote
1 answer
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### Visible angular size

Is it true that given two celestial objects of the same size and at the same distance, the fainter one will appear smaller? Is there a calculation that can be made about how smaller? Is it the same ...
• 11
5 votes
1 answer
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### Would it be possible to use existing radio-telescopes to do spot measurements of CMB?

With CMB peaking at roughly 158GHz would it be possible to create a more precise map of CMB just by sampling 'points' using existing Earth-based radio telescopes? I understand that large dish ...
• 161
1 vote
0 answers
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### CMB maps analysis (Planck, ESA, FITS)

I wanted to analyze Planck mission FITS files and was wondering about the parameters. So the map uses color coding for temperature-based anisotropies right? So the maximum angular resolution is ...
• 161
1 vote
1 answer
516 views

### How to find the distance between stars

I wanted to calculate the distance between the end points of the Orion's belt (Alnitak and Mintaka). I searched in the internet and I found out their angular separation to be 2.736°. Then I searched ...
8 votes
1 answer
543 views

### Why not build a swarm of space telescopes?

James Webb Space Telescope (JWST) has not yet started doing science, yet its successor LUVOIR is being discussed already. However I am curious; some countries have invested billions of dollars in ...
• 183
2 votes
1 answer
231 views

### Do point spread functions from large single telescopes using adaptive optics still look like Airy functions for narrow-band filters?

this answer to Claim that 30-m class telescopes will have resolution far superior to Hubble: true? mentions ...the possibility of attaining near diffraction-limited images using adaptive optics. The ...
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5 votes
2 answers
244 views

8 votes
1 answer
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### Is there a cosmic, rather than technological, upper limit to what a telescope can resolve?

Space radio interferometers could have a baseline of millions of kilometers, but is there a point where a larger baseline doesn't improve the resolution anymore because the photons observed are ...
• 11.4k
6 votes
1 answer
454 views

### Why can't the surfaces of stars be observed?

If I'm correctly informed, only three stars: Sol, Betelgeuse and Altair have surfaces which have been resolved by telescopes. All other stars are only point sources of light, even in the greatest of ...
• 11.4k
81 votes
6 answers
12k views

### Is the Moon only 60x60 pixels?

In doing research on vision, I have learned that "20/20" vision corresponds to a visual acuity of being able to resolve details 1 arcminute in size, that most people have around 20/15 vision,...
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4 votes
1 answer
306 views

### Inability of Hubble to clearly resolve nearby celestial objects

The Hubble space telescope performs incredibly detailed and stunning imaging of celestial bodies that are many, many light years away, and yet when it attempts to image objects within our own Solar ...