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。
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。
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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