His conclusion is based on estimates that suggest that 10,000 objects a quarter mile [0.5 km] or more in diameter move on Earth - intersecting orbits.
Savos spriedumos viņš balstās uz novērojumiem, ka 10 000 objektu, kuru diametrs ir vismaz puskilometrs, kustas pa orbītām, kas šķērso Zemes orbītu.