An advanced remote sensing satellite designed to provide accurate data on the Earth environment, Envisat leaves the space community after 10 years of stunning images and continuous measurements that made possible more than 2500 scientific publications. Launched by the European Space Agency in 2002 to ensure the continuity of data measurements with the European Remote Sensing Satellites ERS-1 and 2, the satellite abruptly stopped communicating last April, soon after its 10th birthday.
However, the natural “death” of Envisat, with its 8 tons weight and the size of a schoolbus, does not only mean the loss of a useful tool for measurements, that will have to be soon replaced by the Sentinels of GMES, but also the birth of a new massive “space debris” and the consequent growth of the population of “space junk” polluting Low Earth Orbits.
Destined to remain in a very populated orbit for about 150 years, posing repeated conjunction and collision hazards to other spacecrafts, the Envisat case triggers a series of legal and political issues and is particularly interesting from a Space Law point of view, as the latter is called to provide unambiguous solutions to a problem that seems to be more and more pressing.
While the debris population grows and the “Kessler syndrome” depicts scenarios that will inevitably push towards a more “sustainable” use of space, a binding legal framework for debris mitigation is indeed still lacking. The adoption of collision avoidance maneuvers or end-of-life measures are until now not imposed by any binding Treaty and are accordingly left to the goodwill of States. In such a context, and especially since such maneuvers require carburant, thus reducing the lifespan of space objects and causing add-up expenditure, the right to access space itself for all spacefaring countries results as unsecured.
Several are the juridical issues that need to be promptly clarified: while a commonly agreed definition of what is a “space debris” should be a primeval step, a clear and binding legal framework on debris mitigation and the clear identification of liabilities in case of collision or damage has to be put in place. However, although none of the existing Space Treaties contains any explicit provisions on the issue, it is to be noted that several general obligations are already in place under the 1967 Outer Space Treaty and the 1972 Liability convention, while general international law already sets out a general principle of neminem laedere, recalled in several ICJ cases and widely considered as customary. Yet, general principles and mitigation “guidelines”, essentially voluntary, proved to be not enough to ensure proper conduct in the medium and long term.
Envisat marks a turning point in space debris management: faced to a quantity of space debris that poses a constant and significant threat to space navigation, the permanence in a logic of voluntary practice and goodwill actions is no more allowed, as the primary freedom of all countries to access space is at stake. All spacefaring nations have contributed to the pollution of space environment and all of them should as soon engage consultations in order to avoid collisions and ensure debris mitigation initiatives, but also support and boost the programs for debris “active” removal, otherwise not always economically viable. In order to guarantee a clear identification of the liable state, the general obligations under art. VII of the Outer Space Treaty and the Liability Convention should be unambiguously defined when dealing with space debris. Although it is clearly stated that the “launching State” will be financially liable in case of damage, the primary definition of manmade debris as space objects under art. 1 of the Liability Convention should be the first step of a process that should lead to a widely ratified treaty on “space debris liability”, much stronger than a code of conduct, and as binding as the Treaties that set the general framework of Space Law during the cold war. While in the present situation the “launching States” can still play on the absence of specific norms and the persistence of grey areas, this cannot be acceptable in the view of a urgent need to impose a conduct that can effectively reduce the risk that, in few decades, the space era itself might finally come to an end.
This article was originally published on Space Safety Magazine on 14 June 2012.
 International Court of Justice.
 Above all, principle 21 of the Stockholm declaration on human environment that imposes to not cause damage to “areas beyond the limits of natural jurisdiction”.
 See also R. Rosanelli, CleanSpace One: In Search of An Active Solution for Space Debris Mitigation, International Security Observer, 19/04/2012
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