Hillary Clinton campaign chairman John Podesta had dealings with two high-profile space enthusiasts seeking to get to the bottom of extraterrestrial life, according to newly-released emails, including one former astronaut who warned against a “war in space.”

The messages, sent by punk band member Tom DeLonge and the late Apollo 14 astronaut Edgar Mitchell, were included in a batch of more than 4,000 emails obtained from Podesta’s inbox and published by WikiLeaks over the last several days.