What science fiction element was NOT part of Zeldovich's studies?
Time machines
Black holes
Expanding universe
Thermonuclear physics
Answer
Time machines were not part of Zeldovich's studies because he focused on astrophysics and cosmology, which deal with the study of the universe on a large scale, rather than time travel, which is a concept that deals with the manipulation of time.
The Extraordinary Legacy: Exploring Yakov Zeldovich's Contributions