兆秒

zhè zhǒng jǐn kōng jiān de mù qián chǐ dù gū jì yuē wéi liù bǎi zhào miǎo chā jù de liàng jí

这种紧空间的目前尺度估计约为六百兆秒差距的量级。

The present size of such compact space is estimated as the order of 600 Mpc.