While is mostly concerned with studying the contents of the universe via whatever means are available, directly pertains to the data-gathering methods themselves.

Use this tag for questions pertaining to how we can observe astronomical objects, as well as for what physical limitations are encountered. This can include, for example, questions about

  • How large a telescope is needed to observe a particular object;
  • How the atmosphere interferes with astronomical observations;
  • Which phenomena can be detected in radio waves, or gamma rays; or
  • The particulars of photometry, spectroscopy, or interferometry as employed in astronomy

are suitable for this tag.

On the other hand, questions only concerned with the data itself, rather than the acquisition of that data, should probably be tagged and not . Similarly, if one is only concerned about underlying physical theories, would be more appropriate than .

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