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Just half a dozen holiday-makers have reached orbit since then, for similarly astronomical price tags.
出自-2015年12月阅读原文
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As an organization of volunteers, AMSAT was putting "amateur" satellites in orbit decades before the current Cube Sat craze.
2019年6月六级真题（第三套）阅读 Section B
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Because they're so small and light, it costs much less to get a Cube Sat into Earth's orbit than a traditional communications or GPS satellite.
2019年6月六级真题（第三套）阅读 Section B
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For instance, a research group here at Arizona State University recently claimed their developmental small CubeSats could cost as little as $3, 000 to put in orbit.
2019年6月六级真题（第三套）阅读 Section B
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Having your personal satellite launched into orbit might sound like an idea straight out of science fiction.
2019年6月六级真题（第三套）阅读 Section B
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However, as the cost of getting your own satellite in orbit drops sharply, the risks of irresponsible use grow.
2019年6月六级真题（第三套）阅读 Section B
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It includes accounting for any piece of debris they plan to release over 5mm that might stay in orbit for 25 years or more.
2019年6月六级真题（第二套）阅读 Section C
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It might seem surprising to think about an item staying in space for that long, but the oldest satellite still in orbit—Vanguard 1—turned 60 in 2018.
2019年6月六级真题（第二套）阅读 Section C
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The greatest concern the authors raise is space debris一pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
2019年6月六级真题（第三套）阅读 Section B