Assertion: mercury's atmosphere | /r/HasProperty | tenuous
Facets:
value: very
type: DEGREE
Source sentences:
text: It has a tenuous atmosphere made up of hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor.
text: Mercury has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10−14 bar (1 nPa).
text: It does have a tenuous atmosphere, but ground and space-based observations see just the gray rocky color of Mercury.