Planetary nebulae play a very important role in galactic evolution.

That is because lower density would mean the current, relatively slow expansion rate is closer to what it had been in the past, allowing more time for galactic evolution.

The void galaxies themselves are thought to represent pristine examples of galactic evolution, having few neighbours, and likely to have formed from pure intergalactic gas.

Astronomers were thrilled that a newly forming galaxy could be studied nearby to learn about galactic evolution, which is normally only observable at great distances.

The principles of balance governed everything, from subnuclear processes to galactic evolution.

A conscious and reasoning human mind is, until shown to be otherwise, the peak of galactic evolution as we now know it.

The telescope will be used for research into cosmic magnetism, galactic evolution, the large-scale structure of the cosmos, dark matter and the nature of transient radio sources.

The Lylmik race is moribund, and humans are the only ones fit to succeed us as guides and guardians of galactic mental evolution.

The Metallicity distribution function is an important concept in stellar and galactic evolution.

MDFs are used to test different theories of galactic evolution.