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You are preparing a presentation for the school science club, using this
article from a scientific website.
Reaching a Tipping Point: What to Do About the Problem of Space Junk?
For over fifty years, slowly at first, but with increasing intensity, we've
been sending objects up into orbit. Most of these items begin life as useful
使節を開始する有用な
devices, such as the thousands of satellites that bring us information and give
装置として
us our 21st century communication, but even these eventually fall out of use
結仕 使われなくなる
or break. These satellites, living or dead, share an increasingly crowded layer,
混雑した層
known as near-earth orbit, with rocket parts, tools, and pieces of metal from
objects that have already crashed together and broken into pieces.
粉々になる
??
This garbage poses a threat both (to working" satellites of which there
are thousands), and (to the earth itself.) For example, in 2009 a disused Russian
使われなくなった
module crashed into an active US satellite) destroying both and forcing the
International Space Station to change course to avoid the thousands of broken
ためらう
pieces. While most junk that falls back to earth burns up in the atmosphere.
大気圏上空で
larger chunks can occasionally hit the ground, posing a threat to people and
Pieces that do burn up] leave pollutants in the atmosphere, such as
Property
aluminum particles, which can destroy the ozone layer
アルミニウム 粒子
It's clear that removing space junk is vital if we are to maintain and
build upon our current satellite network. The problem has been discussed
continuously since the 1970s, when Donald Kessler, a senior scientist at NASA
継続的に
described a scenario (later known as Kessler syndrome) (where a runaway
制御不能の
others more and more likely. While the 2009 incident may be the first large
cycle of collisions begins, with each collision creating more debris, making
衝突のサイクル
near-earth collision, it is thought that Kessler syndrome has already begun
with smaller objects.
Since Kessler syndrome was first described, many solutions have been
proposed, from using lasers to robotic garbage collectors, but cost has been an
obstacle to most. In 2021, a Japan-based company named Astroscale launched
ELSA-d (short for "End-of-Life Services by Astroscale Demonstration") to show
