Ask Ethan: Why does space appear black?
Ethan Siegel

Another interesting thing is that even though space appears black to us it is actually a very deep dark sapphire blue. The reason why it appears black is because it predominately contains hydrogen throughout, which makes it appear black to us. The same phenomenon can be observed in the Black Sea which appears black because of its high concentration of a hydrogen compound.

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.