There is considerable debate over how we should react if we detect a signal from an alien civilisation.
considerable
/kənˈsɪdərəbl/
fairly large, especially large enough to have an effect or be important
debate
/dɪˈbeɪt/
discussion of a particular subject that often continues for a long time and in which people express different opinions
debatable
/dɪˈbeɪtəbl/
things that are debatable are not certain because people have different opinions about them
detect
/dɪˈtekt/
to notice or discover something, especially something that is not easy to see, hear etc
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