1.You can still see the gas or nebulosity in big telescopes and the right filters.

1.用大望远镜和适度的滤色镜，你也可以看到状物。

2.Researchers had known the cluster was encountering a gas cloud, because off striking nebulosity that envelopes the cluster?

2.研究员知道团就是接触，由于冲击包裹了团？