Assertion: surface | /r/HasProperty | safe
Facets:
value: for extravehicular activity
type: PURPOSE
Source sentences:
text: Although previous robotic missions, such as the Surveyor landers, were designed to study the lunar surface as a prelude to planning later Apollo missions, it wasn’t until Armstrong’s “one small step” crunched into the grey powder that NASA was sure the surface was safe for extravehicular activity (EVA).