Houve um erro com a conexão
PDOException: SQLSTATE[HY000] [2002] No route to host in /var/www/html/public_html/conexao.php:12 Stack trace: #0 /var/www/html/public_html/conexao.php(12): PDO->__construct('mysql:host=db.h...', 'estrelas', Object(SensitiveParameterValue)) #1 /var/www/html/public_html/index.php(2): include('/var/www/html/p...') #2 {main}