spiral nebula

Hubble also used Leavitt’s Cepheid variable technique to measure cosmic distances, this time by finding the variable stars in the spiral nebulae themselves.

Curtis was an older, well-respected authority on spiral nebulae, as well as a gifted speaker.

The most interesting specimen of a spiral nebula is situated in Canes Venatici.

Around and around they would whirl in a spiral nebula, till one got a head start on a race for home and mother.

The hypothesis, therefore, that our universe is a spiral nebula has much to be said for it.

It is even suggested that the spiral nebula 162 originated by disruption of one star by a swift-moving passing star.

The spiral nebula is evidently the standard type, and the condensing nebula must conform to it.