The space environment (at least where the Earth’s orbits are concerned) is increasingly congested. As a natural result, collisions between space objects are becoming more likely and much more disastrous.
"Calling Space Traffic Control,"
ILSA Journal of International & Comparative Law: Vol. 23
, Article 6.
Available at: http://nsuworks.nova.edu/ilsajournal/vol23/iss2/6