Assertion: mercury's atmosphere | /r/HasProperty | replenished by a variety of sources
Facets:
value: constantly
type: TEMPORAL
Source sentences:
text: Astronomers think this current atmosphere is constantly being replenished by a variety of sources: particles of the Sun’s solar wind, volcanic outgassing, radioactive decay of elements on Mercury’s surface and the dust and debris kicked up by micrometeorites constantly buffeting its surface.