Trying to snap a three-game losing streak, the Ravens flew to Dolphin Stadium for a Week 7 duel with the Miami Dolphins.  In the first quarter, Baltimore trailed early as Dolphins kicker Dan Carpenter got a 21-yard field goal.  The Ravens would respond with kicker Matt Stover getting a 47-yard field goal.  In the second quarter, Baltimore took the lead as LB Terrell Suggs returned an interception 44 yards for a touchdown.  Miami would answer with Carpenter making a 26-yard field goal, yet the Ravens replied with rookie quarterback Joe Flacco completing an 11-yard TD pass to WR Derrick Mason. In the third quarter, Baltimore increased its lead with Stover nailing a 28-yard field goal.  The Dolphins tried to rally as quarterback Chad Pennington completed a 7-yard TD pass to WR Davone Bess.  Fortunately for the Ravens, in the fourth quarter, the Ravens scored on a 5-yard TD run by RB Willis McGahee.
Question: How many yards was the longest field goal of the first half?
Answer: 47