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.
At the speed of 100,000 km/hour, you would reach Neptune in 5.12 years. so it ''could'' take about 2 years if you travel at a greater speed.It could also take 12 years if you travel at a slower speed. 12 years to travel to Neptune not 5.12 or 130 days. it took voyager 2 twelve years to travel to Neptune.But, he did stop at other planets along the way.t the fastest current spacecraft speed (other than re-entry from the Moon), which is about 60000 km/hr, it would take at least 100 days to reach Mercury, depending on its pos â¦ ition in its orbit. It could take as long as 120 days.