Assertion: mercury's transit | /r/HasProperty | observed
Facets:
value: from a celestial body besides earth
type: OTHER
Source sentences:
text: He suggested that no transits had been observed either because planets such as Mercury were too small to see, or because the transits were too infrequent.
text: For both Mercury and Venus, he suggested that no transits had been observed because the planet was either too small to see or because the transits are too infrequent.
text: On June 3, 2014, the Mars rover Curiosity observed the planet Mercury transiting the Sun, marking the first time a planetary transit has been observed from a celestial body besides Earth.