Assertion: moon | /r/CapableOf | look blue
Facets:
value: for nearly two years
type: TEMPORAL
Source sentences:
text: If the Moon looks blue, it's because of dust in the atmosphere.
text: The Moon, full or any other phase, can appear blue when the atmosphere is filled with dust or smoke particles of a certain size: slightly wider than 900 nm.
text: Dust particles can make the Moon look blue.
text: Eruptions like the ones on Mt. Krakatoa in Indonesia (1883), El Chichon in Mexico (1983), on Mt. St. Helens in the US (1980), and Mount Pinatubo in the Philippines (1991) are all known to have made the moon look blue.
text: The Full Moon can look red if other sizes of dust particles fill the atmosphere or during Total Lunar Eclipses, which are much more common than Moons that look blue.
text: The particles scatter the red light, making the Moon appear blue.
text: The effect can be caused by smoke or dust particles in the atmosphere, as has happened after forest fires in Sweden and Canada in 1950 and 1951, and after the eruption of Krakatoa in 1883, which caused the moon to appear blue for nearly two years.