The drawing of the nebula of Orion was published in the Phil.
Antoniadi discovered that a nebula surrounded it.
0 Orionis is a multiple star, situated in the famous nebula of Orion, one of the most beautiful in the heavens.
In fact a little consideration of the theory of probabilities will show it to be infinitely probable that such an object should really have some movement of rotation, no matter by what causes the nebula may have originated.
The condensation of a nebula could be followed in the same manner as we can study the growth of the trees in the forest, by comparing the trees of various ages which the forest contains at the same time.