Chinese space scientists were not in control of their Tiangong-1 orbiting laboratory when it hurtled back to Earth and into a remote part of the Pacific Ocean on Monday. But if they had been, that’s where they would have tried to make it land.
By sheer fluke, anything that didn’t burn up in the atmosphere is expected to have plopped down somewhere near the forlorn spot that is amongst the most remote places on the planet.
Officially called an “oceanic pole of inaccessibility,” this watery graveyard for titanium fuel tanks and other high-tech space debris is better known to space junkies as Point Nemo, in honour of Jules Verne’s fictional submarine captain.
‘Nemo’ is also Latin for “no one”.
Point Nemo is further from land than any other dot on the globe: 2,688 km from the Pitcairn Islands to the north, one of the Easter Islands to the northwest, and Maher Island — part of Antarctica — to the South.
“Its most attractive feature for controlled re-entries is that nobody is living there,” said Stijn Lemmens, a space debris expert at the European Space Agency in Darmstadt, Germany.
“Coincidentally, it is also biologically not very diverse. So it gets used as a dumping ground — ‘space graveyard’ would be a more polite term — mainly for cargo spacecraft,” he said.
Some 250 to 300 spacecraft have been laid to rest there, he said.
By far the largest object descending from the heavens to splash down at Point Nemo, in 2001, was Russia’s MIR space lab, which weighed 120 tonnes.
“It is routinely used nowadays by the (Russian) Progress capsules, which go back-and-forth to the International Space Station (ISS),” said Lemmens.
The 420-tonne ISS also has a rendezvous with destiny at Point Nemo in 2024.
In future, most spacecraft will be “designed for demise” with materials that melt at lower temperatures, making them far less likely to survive re-entry and hit Earth’s surface.
Both Nasa and the ESA, for example, are switching from titanium to aluminium in the manufacture of fuel tanks.
China hoisted Tiangong-1, it’s first manned space lab, into space in 2011. It was slated for a controlled re-entry but ground engineers lost control of the craft in March 2016, which is when it began its descent towards a fiery end.
The lab’s demise has been the subject of much chatter among space watchers for months. Scientists, however, were sure it would most likely land in the ocean. — AFP
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