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.
The distance from the Sun to Neptune is 4,504,300,000 kms <br /> Light travels 9,460,730,472,580,800 kms a year<br /><br />So light would take just over four hours to get from the Sun to Neptune.<br /><br />Most of us have taken a 4-hour road trip. So imagine driving solidly for over four years.