Is Earth truly defenceless? NASA has revealed that over 15,000 'City-Killer' asteroids are currently undetected in our solar system. In this episode of Fiscal Point, we look at the science of planetary defense, the upcoming NEO Surveyor mission, and what it takes to stop a cosmic disaster. <br /><br />#NASA #Asteroid #SpaceNews #PlanetaryDefense #ScienceNews <br />
