Nick Moskovitz of Lowell Observatory discusses planetary defense, asteroids and Dark Skies.  Was defending the earth from deadly asteroids as shown in the movie Armageddon with Bruce Willis so far fetched?  Is space junk such a threat as displayed in Gravity starring Sandra Bullock?  Mark Haughwout and Nick Moskovitz discuss the real science behind these movies. #planetarydefense #asteroids #darkskies