Why is space junk considered a problem?

为什么太空垃圾被认为是一个问题？

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Many scientists are also suggesting different ways to clean up space junk.

许多科学家也提出了清理太空垃圾的不同方法。

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According to BBC News, there are more than 22,000 pieces of space junk floating around the earth.

据 BBC 新闻报道，有超过22000块太空垃圾漂浮在地球周围。

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They include nets,giant collecting arms and powerful laser beams that would move or destroy space junk.

VOA: special.2009.04.01

They warn that the amount of junk in Earth's orbit is increasing and, as it does,the risks to satellites and space vehicles,also rise.

VOA: standard.2010.07.24

Dr.Craig Smith,the chief executive of Electro Optic Systems, says laser beams fired from the ground could protect astronauts and satellites by targeting space junk that travels at potentially devastating speeds.

VOA: standard.2010.07.24

The only emerging market nations to see downgrades or credit outlook changes to negative were in the junk bond space, and some corporates.

FORBES: "Third World" No More as Emerging Markets Upgraded, Developed Markets Downgraded

The harpoon is clearly aimed at capturing the larger objects but many other solutions have been proposed, including the use of lasers to nudge space junk out of the way, or using giant nets and space tugs.

CNN: Space harpoon plan to nail orbital garbage

Some fly by night piece of space junk that doesn't even have a name?

NPR: A Down-to-Earth View of the Planet Debate