Any missions hoping to go farther will need a means of acceleration that can get the spacecraft to the edge of explored space faster—before it has depleted its radioactive power source.

故而，任何更深空的宇宙探索都需要寻找技术途径来加速航天器，以便在放射性能源耗尽之前到达星系边缘。

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So, they generally run on highly radioactive power sources, which are dangerous even during launch.

所以，飞船的飞行通常依赖于高强度的辐射能源，这种能源甚至在发射时也是有危险的。

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In 2009, Esa funded a pilot project to examine the cost and practicality of establishing a European source of material for Radioactive Power Sources (RPS).

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Radioactive materials used in nuclear power generation must be isolated from human or environmental contact for thousands of years.

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Rokkasho has been seen as a facility that will allow Tokyo to reduce radioactive wastes from its nuclear power plants by reprocessing spent nuclear fuel.

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