docs: def _download_ned_source_metadata(
              self):
          """*Query NED using the names of the NED sources in our local database to retrieve extra metadata*
  
          *Usage:*
  
              .. code-block:: python
  
                  stream._download_ned_source_metadata()
          """
          self.log.debug('starting the ``_download_ned_source_metadata`` method')
  
          self.dbTableName = "tcs_cat_ned_stream"
  
          total, batches = self._count_ned_sources_in_database_requiring_metadata()
  
          self.log.info(
              "%(total)s galaxies require metadata. Need to send %(batches)s batch requests to NED." % locals())
  
          totalBatches = self.batches
          thisCount = 0
  
          # FOR EACH BATCH, GET THE GALAXY IDs, QUERY NED AND UPDATE THE DATABASE
          # THEN RECOUNT TO DETERMINE IF THERE ARE REMAINING SOURCES TO GRAB
          # METADATA FOR
          while self.total:
              thisCount += 1
              self._get_ned_sources_needing_metadata()
              self._do_ned_namesearch_queries_and_add_resulting_metadata_to_database(
                  thisCount)
              self._count_ned_sources_in_database_requiring_metadata()
  
          self.log.debug(
              'completed the ``_download_ned_source_metadata`` method')
          return None