Neptune is about 30 astronomical units from the sun (an astronomical unit, or AU, is the average radius of Earth's orbit, about 150m kilometres).
A light year is about 50,000 astronomical units (an AU is the average radius of the Earth's orbit, a little under 150m kilometres).
True, the lunar orbit, with an average radius of 384,403 kilometers, is puny in cosmic terms, but similar near-misses aren't all that uncommon.
Average radius of particles.
A Zetasizer determined an average radius of 60 nm.
The average radius of the impurities is noted ρ0.
The measured average radius of the scallops was proportional to the cube root of time.
The micelle displayed significant fluctions in shape and had an average radius of about 9 Å.
The shift in the injection position was taken as the average radius of the bubbles.
We hence attribute the red shift to the increase in average radius of the nanocrystallites.
where aa and a represent the average radius of the aggregates and single particles, respectively.
