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0 votes
0 answers
17 views

Comparing the mapping regions of sky surveys - southern hemisphere in particular

4 votes
1 answer
419 views

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

1 vote
2 answers
63 views

I've set up my NatGeo telescope but can't see anything from the main telescope lens after using the view finder to focus on an object

1 vote
1 answer
88 views

Is it plausible to use Sirius A for a proposed FOCAL mission in the future?

4 votes
1 answer
267 views

Can reflections of powerful gamma-ray bursts reveal normally undetectable distant objects in the solar system?

2 votes
3 answers
55 views

Celestron X-Cel Barlow 2x magnification or Celestron X-Cel LX eyepiece 5 mm for 250P Dobsonian Sky-Watcher Telescope

3 votes
0 answers
70 views

How to find the minimum range at which some imaging payload/instrument can produce a clear image?

5 votes
3 answers
653 views

Difference in field of view between JWST and Euclid

13 votes
4 answers
2k views

Vera C. Rubin's LSST's ginormous camera's shutter; why does it open/close 1000 times a night & is this typical for large-format survey telescopes?

1 vote
2 answers
181 views

Given our current level of a technology, how far could we send a signal that we could detect?

1 vote
1 answer
87 views

What was the first nebulae of the first class?

2 votes
1 answer
99 views

C8 Finder Rotates Freely

0 votes
0 answers
96 views

Largest Optical Telescope NOT at Higher Elevation

1 vote
0 answers
32 views

Published magnitude limits of surveys

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