Actually, depending on how the word is used, either can be correct.
"The heavens opened up and it rained for 3 days."
"I hope I get to see St. Peter when I arrive at Heaven's gate."
Both are grammatically correct.
The "sientific" name for the heavens would be... that there is no heavens.
there are seven heavens on the seventh there are the prophets, companions of them etc.
what rye of verb is "from the heavens"
the brightest star in the heavens is Vega
He was not in the heavens, he was in the sea.
Heavens - band - was created in 2006.
Heavens - band - ended in 2008.
Heavens to Betsy ended in 1994.
Stream from the Heavens was created in 1994.
Beware the Heavens was created in 1999.
The Mirrored Heavens was created in 2008.
Below the Heavens was created in 2006.