Alaska Gov. Sean Parnell, Sarah Palin's successor, appeared stumped by a question about the age of the earth Thursday, choosing not to answer a multiple choice question regarding the matter during a gubernatorial debate."Only God knows," Parnell responded, when asked if the earth was more accurately described as "6,000" or "six billion" years old.Democratic candidate Ethan Berkowitz wasted no time, telling the moderator, "I'll go with six billion."Read More... More on Elections 2010