47
votes
Accepted
Why is the summer solstice night shorter than the winter solstice day?
Why is the summer solstice night shorter than the winter solstice day?
Aside: If you use your sunrise / sunset calculator you will see that day and night are not equal at the equinoxes. The reason ...
- 28.1k
4
votes
Can we measure planetary Love number of exoplanets?
In short, the answer is: yes.
This paper provides an example of direct measurement of the tidal deformation of the close-in Jupiter WASP-103b whose quadrupole Love number turned out to be close to ...
- 346
3
votes
Accepted
How do I phase fold the light curve for a variable star?
"Phase folding" is just a procedure whereby you replace the time-axis values by t % P, where P is the period and % is the modulo operator that returns the remainder of t/P.
There are are a ...
- 115k
3
votes
Accepted
redshift puzzle
But $\Delta \lambda$ does depend on $\lambda_0$. The wavelength redshift is not a uniform value.
In order to (correctly) do the redshift estimation by cross-correlation, your spectra should have been ...
- 115k
3
votes
What exactly causes "color twinkling" and why does it seem that any color might be furthest refracted for a moment?
This is more a hypothesis rather than a definitive answer. Below is a photo of a prism with the camera in the path of the separated colors. Only a small part of the spectrum actually falls on the ...
- 1,139
3
votes
following several unknown phenomena detected at the edge of the solar system, is there a 5th force which acts at the edge of the solar system?
I've reviewed your sources, but I don't think they make the claims you say they do. The first relates to interactions between solar wind electrons and cosmic rays. This interaction is complex and ...
- 88.7k
3
votes
Accepted
Does "Angular Diameter Turnaround Point" solve the Great Wall Problem?
Expansion of the Universe, not of small structures
It is true that large "structures", such as unvirialized clusters, and voids, scale with the expansion of the Universe, but smaller ...
- 32.1k
3
votes
Is there any specific way to record observations on any celestial object while looking through a telescope?
There are several observational astronomy tasks that have traditionally had active amateur participation. The important things to note will vary depending on the task, but will include the precise ...
- 2,691
2
votes
Accepted
Method to get data from NED IPAC and NVSS, without manually giving RA/dec input
Unfortunately although a lot of astronomy image/catalog services allow uploading a file of object names or coordinates to query, it seems the NVSS postage stamp server is not one of them. The only way ...
- 7,170
2
votes
In terms of results, how similar is a bunch of telescopes across the globe to an Earth-sized telescope?
Aside from trying to phase-sync optical scopes across such large distances, the problem is one of spatial frequency filtering. If you look thru any decent book on optics (I highly recommend Smith's ...
- 3,578
2
votes
In terms of results, how similar is a bunch of telescopes across the globe to an Earth-sized telescope?
In regards of resolution a virtual telescope acts identical to a normal telescope: size matters:
More accurately, the optic's diameter $D$ and the wavelength $\lambda$ determine the resolution or ...
- 11k
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