Answer: arewealone

AnswerCrossword Clue
AREWEALONE"Is it safe to talk?"
AREWEALONEFurtive question
AREWEALONECentral question in the search for extraterrestrial life
AREWEALONEConspirator's cautious conversation starter
AREWEALONEExobiologist's query
AREWEALONESpy's query at the start of a meeting
AREWEALONEWhat cosmologists wonder
AREWEALONE"Can anybody hear us?"
AREWEALONE'Is anyone else here?'
AREWEALONEQuestion for SETI
AREWEALONEQuestion of humanity that has never been answered
AREWEALONEWhat many stargazers wonder
AREWEALONEA question of cosmology