Long March 5b just missed the Maldives. Image: “Diamonds Thudufushi Beach and Water Villas, May 2017, Ari Atoll, Maldives.” by Martin Falbisoner, 2017. Wikimedia commons.
It was a long march and a splash entry. On 8 May, the Long March B5 fell from space into the Indian Ocean, thankfully missing the nearby 1, 192 islands of the Maldives. Long March 5B launched on 29 April 2021, conveying into orbit the hefty main module of the new space station that China is building, to open in 2022. Some questioned the decision not to fire the Long March 5B rocket engine after releasing its payload, therefore sending it into “uncontrolled reentry.”
“Long March 3B Launch,” by Aaxanderr, 2008, public domain creative commons.
Even if the odds were good, since 70% Earth happens to be water, dumping space debris in the ocean whether in controlled or uncontrolled reentry, may not the best practice. Just ask the marine life at 72.47 degrees East and 2.65 degrees North.
“It starts right here – in Maldives.” by Nattu, Male, Maldives, 2008. Image: Creative Commons 2.0, wikimedia.
Controlled reentry aims at a watery grave. Coordinates 48 degrees 52.6 minutes south latitude and 123 degrees 23.6 minutes west longitude mark Point Nemo, or the Oceanic Pole of Inaccessibility. It’s 1,450 nautical miles from anywhere, which is why it is the chosen splash-down spot for space detritus. Between 1971 and 2016, space agencies worldwide crashed 260 spacecraft into Point Nemo: there’s part of the MIR space station, a SpaceX rocket, and over 100 resupply vehicles. Over time we may regret that ditching strategy, no matter how much we believe Point Nemo or the Oceanic Pole of Inaccessibility poses no problems. As water rights develop, the International Seabed Authority (ISA) may rule on Point Nemo.
“Point Nemo or the Oceanic Pole of Inacessibility,” by Timwi 2007. Creative Commons Public Domain. Image: wikimedia.
But most space debris never gets to Point Nemo. There are an estimated 9,000 tones of material circling Earth. Many pieces like old satellites drop out of orbit and burn up before they hit the surface (that’s what happened to Sputnik, the first object in space in October 1957). But even such burning is cause for concern. Little has been done to assess effects on the upper atmosphere, especially consequences of alumina particles that remain trapped and can deplete the ozone layer. The protective layer that keeps Earth from ultraviolet radiation was the subject of the 1987 Montreal Protocol and 2016 Kigali Amendment.
“Image of Depleted Ozone Layer on South Pole Antarctica 2006.” Image credit: NASA. http://www.nasa.gov/vision/earth/lookingatearth/ozone_record.html
Space business is increasing faster than we can keep up in laws and treaties. For example, early laws and conventions spoke only of governments, on the assumption that space was just too expensive for private enterprise. Today, companies like SpaceX are rewriting that text. Space law’s founding documents include the 1967 Outer Space Treaty and the 1972 Space Liability Convention. The first regulates what people can do in space; the second considers how to assign responsibility for activities or objects that cause damage. With satellite constellations like SpaceX and OneWeb launching rapidly, the sky is suffering from traffic, some of it from dead satellites taking of space while waiting to drop, burn, or splash. And we’re putting more up there. As of August 2020, there were 2,787 satellites in orbit (1,364 of those are communication satellites used by business and government). In addition, there are 3,000 dead satellites (and 34,000 pieces of space junk bigger than 10 centimeters and who knows how many particles) still up there, and causing not only traffic but danger.
“Image of Space Debris and Human Spacecraft.” NASA.gov.
We’re only getting started. Since COMSAT began, we’ve sent more satellites, and spacecraft, each year. Estimates now predict 9,000 units by 2025. Some of those will burn, some will splash, and eventually some of them will be retrieved. It’s a new industry. Watch for more laws about what goes up and how it comes down, along with innovations in space sanitation.
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Myers, Steven Lee and Kenneth Chang. “China Says Debris From Its Rocket Landed Near Maldives.” 8 May 2021. The New York Times. https://www.nytimes.com/2021/05/08/science/china-rocket-reentry-falling-long-march-5b.html?referringSource=articleShare
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United Nations, Environment Programme, Ozone Secretariat. “The Montreal Protocol on Substances that Deplete the Ozone Layer.” https://ozone.unep.org/treaties/montreal-protocol-substances-depleete-ozone-layer/text
United Nations, Environment Programme, Ozone Secretariat. “The Kigali Amendment.” https://ozone.unep.org/treaties/montreal-protocol/amendments/kigali-amendment-2016-amendment-montreal-protocol-agreed
United Nations. Office for Outer Space Affairs. “Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies. https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introouterspacetreaty.html
United Nations, Office for Outer Space Affairs. “Convention on International Liability for Damage Caused by Space Objects.” https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introliability-convention.html
Building the World Blog by Kathleen Lusk Brooke and Zoe G. Quinn is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unp