home / medterms medical dictionary a-z list / ethmoid sinus definition Medical Definition of Ethmoid sinus Ethmoid sinus: A collection of air cells within the ethmoid bone, a spongy bone which makes up the front of the floor of the skull and the roof of the nose. From the Greek ethmos, sieve + eidos, resemblance = like a sieve.
Confidence votes 84.8K. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit.
Neptune is so far from the sun that high noon on the big blue planet would seem like dim twilight to us. The warm light we see here on our home planet is roughly 900 times as bright as sunlight on Neptune. Long Time Did you know that one year on Neptune is equal to about 165 Earth years? This fact makes Neptune the planet with the longest year. 165 Earth years is a long time, especially when we consider that the planet in second place for this title (Uranus) takes only about 84 Earth years to complete its year. The Invisible World Want to go outside and view the planets without a telescope? You can, but you won't see Neptune.