# Tag Info

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
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
Accepted

### How many stars can we resolve?

I tried to get a estimate for an upper-bound with currently deployed instruments. Assuming that, resolution-wise, the James Webb Space Telescope is the best telescope we have today, I looked into its ...
• 677
Accepted

### What are those stars that cross the galactic center?

Nice question and interesting data! Going through the references of the linked site, one gets a more verbose description of the video: After more than 1,000 nights of observations spread over 15 ...
• 11k
We can treat this as a Poisson point process: the probability that there are $N$ points inside a volume $V$ with point density is $\rho$ $$\Pr[N|V,\rho]=\frac{(\rho V)^N}{N!}e^{-\rho V}.$$ This ...