This research initiative includes the SERENDIP project, which obtains data by “piggybacking” off of whatever observation plan is already running. For 10 points each:
[10e] Name this research initiative that is known by a four-letter acronym. The lack of evidence obtained by this initiative is known as the Fermi paradox.
ANSWER: SETI [or search for extraterrestrial intelligence; prompt on search for extraterrestrial life; prompt on descriptions of looking for alien life]
[10h] While some SETI projects have observed at so-called “magic frequencies,” most SETI searches have focused on this spectral band between the 21-centimeter line and an 18-centimeter line corresponding to radiation from interstellar hydroxyl radicals.
ANSWER: water hole
[10m] This experimental technique has not been used by any major SETI project, despite its ability to screen out terrestrial interference. This technique constructs a visibility function by correlating the observations from multiple radio telescopes that are kilometers apart.
ANSWER: VLBI [or very-long-baseline interferometry; prompt on interferometry]
<ES, Other Science (Astronomy)>