然而，要到达26万亿英里之外的半人马座阿尔法星，携带和储存足够量的反物质难度极大，这种燃料不仅状态不稳定，而且耗资不菲。
However, getting enough antimatter for the 26 trillion-mile, one-way trip to Alpha Centauri and storing such a volatile fuel for long periods is prohibitively expensive and difficult.
这可归结于在一个时期内恒星活动不稳定与查姆帕拉星生命早期进化恰好同期所致。
This dated back to a period of solar instability coinciding with the early evolution of life on Champala.
出于脉冲星中粒子加速问题，讨论外电场中注入的正负电子对静电不稳定性。
Motivated by the particle acceleration problem in pulsars, it is numerically investigated for electrostatic instability of electron-positron pairs injected in an external electric field.
本文中我们利用盘不稳定模型和星爆模型的基本思想，模拟活动星系核在光学波段的光度和光谱斜率变化，并将模拟的结果和观测进行比较。
In this paper, using disk-instability model and starburst model, the AGN optical variability and spectral slope variability are simulated and confronted with observations.
因其色禁闭及小体积特点，低质量裸奇异星可以非常快地自转且几乎不受引力辐射不稳定性的约束。
Besides small thermal radii, low-mass quark stars could spin very fast, with a negligible effect of r-mode instability.
因其色禁闭及小体积特点，低质量裸奇异星可以非常快地自转且几乎不受引力辐射不稳定性的约束。
Besides small thermal radii, low-mass quark stars could spin very fast, with a negligible effect of r-mode instability.
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