Klassifikation der Library of Congress [LCC] (USA)QB461.5

21st century(7) African American(15) American(6) astrophysics(716) autobiography(24) biography(90) black history(7) black holes(14) chemistry(11) cosmology(167) cosmos(8) curiosity(5) dark matter(8) digital(8) earth(6) education(6) educational(8) essay(8) feminism(5) fusion(5) future(10) futurism(11) galaxies(22) general relativity(10) history(34) history of science(20) letters(9) light(8) Mars(7) math(14) natural science(15) nature(6) outer space(12) physique(5) picture book(11) planets(12) poc(5) popular science(37) professional(8) quantum mechanics(8) quantum physics(9) racism(11) reference(23) relativity(11) science(1,010) science and technology(9) science fiction(6) science nonfiction(5) scientists(17) social justice(7) solar system(15) space and time(11) space exploration(9) spacetime(5) stars(42) theoretical physics(7) time(9) universe(46) usa(9)