The longest palindrome has infinite length. Start with any palindrome, e.g. "radar". You can make a new palindrome: "radar, sides reversed, is radar". Tha

The longest palindrome has infinite length. Start with any palindrome, e.g. "radar". You can make a new palindrome: "radar, sides reversed, is radar". That can then be used to create the palindrome "radar, sides reversed, is radar, sides reversed, is radar, sides reversed, is radar". You can repeat this indefinitely.