Assertion: mercury's atmosphere | /r/HasProperty | substantial
Facets:
Source sentences:
text: Mercury is the closest planet to the Sun in Earth’s solar system, but has no moons and no substantial atmosphere.
text: The existence of a Mercurian atmosphere had been contentious before 1974, although by that time a consensus had formed that Mercury, like the Moon, lacked any substantial atmosphere.
text: Mercury is very close to the Sun and has no substantial atmosphere.