> Assuming a size for 'Oumuamua of 50 – 130 meters, what they get is a very low density: About 0.00005 grams per cc.
Do we have example of naturally ocurring space object with such low density?
Half-close? Quarter-close?
Do we have example of naturally ocurring space object with such low density?
Half-close? Quarter-close?
Depends what you mean by "object. Assuming the mass is mostly protons, that corresponds to a density of ~3e19 particles per cc. In comparison, molecular clouds in the galaxy have regions which are have densities as low as 1e2 particles per cc. And the hot X-ray emitting gas in clusters can be less than 1 particle per cc. There are things which span the gap, including disks around stars.