On Saturday, Aug. 25, the world lost a true American hero. After learning of Neil Armstrong’s passing at the age of 82, millions of people — celebrities included — took to their Twitter accounts to honor and commemorate the first man ever to step foot on the moon. Ryan Seacrest: “Thanks Neil Armstrong for bringing the moon into our living rooms & curiosity into our minds. One giant loss for mankind.” Mitt Romney:"Neil Armstrong today takes his place in the hall of heroes. The moon will miss its first son of Earth." Alyssa Milano:"Rest in peace, Neil Armstrong. You are such an inspiration … " Seth Green: "RIP Neil Armstrong. Proof that humans can always push further." Ricky Martin:"RIP Neil Armstrong" Josh Duhamel:"One of our greatest heros [sic] died today. RIP Neil Armstrong” Ashley Judd:"How poetic that in the month of #NeilArmstrong passing, there will be a Blue Moon." Rob Lowe:"Neil Armstrong: One giant leap … to the arms of God. #OhioHero #Wapokonetta" Barack Obama:"Today, Neil’s spirit of discovery lives on."