Rearranging the letters of 'is there life in other galaxies' (Space) gives:
Aliens of high, rare elite exist?
(by Aronas Pinchas) (2011) (pending approval)
Alienate or sexiest high flier.
(by Tammy Silverman using Anagram Genius) (2008) (pending approval)
Other related anagrams without their own page:
"Is there intelligent life on Mars?" -> "Tell the aliens' Foreign Minister." (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Is there intelligent life on Mars?" -> "Little alien engineers form this." (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Is there intelligent life on Mars?" -> "Millions! Theatre lift engineers!" (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Is there intelligent life on Mars?" -> "Net literate green fish. Millions!" (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Is there intelligent life on Mars?" -> "It's little green alien men, or fish!" (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Life on other planets" -> "Let proof aliens, then!" (by Aronas Pinchas) (2011) (pending approval)
"Mars dome life applicant" -> "Plain pact, emailed forms." (by Jim Banholzer) (2018) (pending approval)
"Intelligent extraterrestrial beings" -> "Exist. Belligerent. Inaner star glitter." (by Maria Cecília by hand) (2007) (pending approval)
"Is There Life on Mars?" -> "Aliens? Mothers' rife!" (by Mick Tully using Anagram Genius) (2005)
"Is There Life on Mars?" -> "Monster flies, I hear." (by Mick Tully using Anagram Genius) (2007) (pending approval)
"Astronomers" -> "Morons stare." (by V.Rabin by hand) (2004)
"Astronomers" -> "A Moron rests." (by K. Smiles Mascarenhas using Anagram Genius) (2004)
"Astronomers" -> "Moon arrests!" (by Jean
Merges by hand) (2002)
"Astronomers" -> "No more stars." (by Jonathan Alwaye) (1995)
"Astronomers" -> "Moon Starers." (by Jonathan Alwaye) (1970)
"Astronomers" -> "On more Stars." (by K. Smiles Mascarenhas using Anagram Genius) (2012) (pending approval)
"Astronomers" -> "More Star, son." (by K. Smiles Mascarenhas using Anagram Genius) (2012) (pending approval)
"Astronomers" -> "O! Star sermon." (by K. Smiles Mascarenhas using Anagram Genius) (2012) (pending approval)
"Astronomers" -> "Moon rasters." (by K. Smiles Mascarenhas using Anagram Genius) (2012) (pending approval)
"Astronomers" -> "A snore storm." (by Lucas Venechuk by hand) (2007) (pending approval)
"Rational" -> "Not a liar." (by L. Lomasky using Anagram Genius) (2005)
"Planet found at perfect spot for life - in solar system with three suns" -> "Scientists: People, New Home to stay! Fresh, fruitful land! Apts for rent!" (by Aronas Pinchas ) (2011) (pending approval)