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The adverb “Tellingly” (second paragraph) could be...
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In May 2021, a hole was found in a robotic arm aboard the International Space Station (ISS). The suspected culprit was a piece of rogue space junk. While thankfully no astronauts were injured, it has re-focussed attention on the growing problem of orbital debris.
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How did we get here?
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It’s easy to forget that just seven decades ago the Moon
was the only thing orbiting the Earth. On 1 January 2021 there
were 6,542 satellites in orbit. Tellingly, only just over half of
them were active. That’s a lot of useless metal careering around
the planet at 28,000 kph — ten times faster than a bullet.
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How bad is the problem?
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Very bad and getting worse. Estimates suggest there are
currently half a million pieces of debris the size of a marble or
larger and 100 million pieces of debris above one millimeter
across. Yet only 27,000 pieces are actively tracked by the US
Department of Defense.
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What is Kessler syndrome?
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It’s a catastrophic chain of events in which a satellite is
shattered by a piece of space junk (or a collision with another
satellite) and the resulting debris destroys more satellites creating
more junk and so on in a never-ending cascade. It’s a domino
effect – one piece falls and then takes the rest with it – and is
named after NASA scientist Donald Kessler, who outlined the
dangers back in 1978.
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What can we do about it?
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Better regulation of new launches would help, as right
now it’s a bit of a free-for-all. There are existing regulations in
place to try and mitigate the dangers, such as a 25-year de-orbit
rule for missions in low-Earth orbit. However, ESA’s Space
Debris Environment Report says that less than 60 per cent of
those flying in low-Earth orbit currently stick to the rules.
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Colin Stuart. Space Junk: Is it a disaster waiting to happen?
Internet: <www.sciencefocus.com> (adapted).
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Considering the text above, judge the following items.
The adverb “Tellingly” (second paragraph) could be correctly replaced with convincingly, without changing the meaning of the text.
C
Certo
E
Errado