One of the world's leading astronomical research facilities is right here in the Bay Area, but scientists there say they're worried that a growing local trend will make it difficult to continue doing their job.
Nebula
A nebula is a huge, diffuse cloud of gas and dust in intergalactic space. The gas in nebulae (the plural of nebula) is mostly hydrogen gas (H2). The plural of nebula is nebulae or nebulas.