Statements (4)
| Predicate | Object |
|---|---|
| gptkbp:bfsLayer |
4
|
| gptkbp:bfsParent |
gptkb:First_human_exploration_of_the_Moon
|
| https://www.w3.org/2000/01/rdf-schema#label |
Engineering challenges
|
| gptkbp:includes |
overcoming sonic barriers
|