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.
It only took Voyager 2 about 15 years to get to Neptune (and at the time I think Neptune was farther than Pluto). It will take New Horizons less than 10 years to make it to Pluto, arriving about a year from now. As the crow and the light beam fly the furthest planet is at most 4 light hours away. So that is the shortest possible trip time. Our best vehicles travel at. 1/40,000 the speed of light so the trip time is about 160,000 hours by the shortest route.