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6
votes
4answers
105 views

Does the current light pollution set a fundamental limit for the range of Earth-based telescopes?

As far as I know, all deep-sky pictures are captured with the Hubble Space Telescope. If there would be no atmospheric distortion, could we make deeper pictures in the optical spectrum with ...
2
votes
2answers
178 views

Is it possible to block light pollution?

The old theory about seeing stars during the day if you stand i the bottom of a well or chimney is proven wrong because the atmosphere scatters the sunlight and makes it too bright to see the stars ...
1
vote
2answers
454 views

Light pollution calculation using camera

Is it possible to calculate light pollution values using camera (analyzing camera feed) integrated in new smartphones (8 Mpx camera) but with pretty decent accuracy? Or that is only possible with ...
1
vote
0answers
29 views

Light pollution and visibility of Milky way [closed]

Say, 1000 years ago, when there was (almost) no light pollution or air pollution, would the milky-way galaxy have been visible at night, anywhere on Earth?
1
vote
3answers
104 views

astronomy & light pollution [duplicate]

If you were staring to the sky in a big city and electricity is turned off in a big area around you, would you be seeing the sky with little light pollution instantly?
0
votes
1answer
2k views

Why do night sky appear red when it is cloudy?

Since childhood, I have seen that whenever at night, the sky is cloudy, the sky becomes red. But, clouds are grayish, so it is expected that the sky becomes more darker. But no, it is not! Why does ...
0
votes
1answer
33 views

Does scanning a lightsource affect the scan result?

I'm very much a layman on this kind of topic, so my logic may be wrong, but here goes: Sample situation A 'pass app' on your smartphone, allowing someone to scan your ticket on your device. My ...
0
votes
0answers
29 views

Is it possible to approximately know the wattage/luminosity of a lamp knowing distance and using a DSLR?

I'd like to know if it is possible to approximately know the wattage/luminosity of a lamp knowing distance and using a DSLR (digital single lens reflex camera) mounted on tripod. Maybe, when shooting ...
0
votes
0answers
29 views

How can air pollution contribute towards light pollution?

I was just wondering if air pollutants such as soot, could reflect light into the night sky, and thus be a potential source of light pollution. If that's true, can you please suggest any other air ...
0
votes
1answer
177 views

Why do clouds appear only and only red at night [duplicate]

I have till now in my life I have always seen clouds only white or black or grey in day but in night why they are always red I could never found it's reason. And also sometimes in day time I see ...