Albert Einstein was one of the most influential physicists of the 20th century, and his work revolutionized our understanding of space, time, gravity, and the universe.

Here's why we can say he knew about space:

* Theory of Relativity: Einstein's theories of special and general relativity fundamentally changed our understanding of space and time. He showed that space and time are not absolute but are relative to the observer's motion.

* Gravity: His theory of general relativity explained gravity as a curvature of spacetime caused by massive objects, like stars and planets.

* Black Holes: While Einstein didn't directly predict black holes, his theory of general relativity laid the theoretical groundwork for their existence.

* Expansion of the Universe: Einstein's equations were used by astronomers to understand the expansion of the universe.

So, yes, Albert Einstein knew a great deal about space, and his work has had a lasting impact on how we view the universe.