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's 2.7 billion miles to Neptune, or 4 hours traveling at the speed of light. While Pluto isn't officially a planet, it would take roughly the same to reach Pluto as Neptune since they are sometimes the same distance away. The New Horizons spacecraft will reach Pluto around July 2015, after traveling a total of 9.5 years. Written Jul 11, 2014 Â· View Upvotes Â· Answer requested by 1 person.