Do... Ra... Me...

The solution is more than the answer to the individual clues. Email the solution to mark@marcasoft.com for an award certificate.


Civilizations deem these as important.
Calendars were created using these.
Geminiano Montanari studied these.
Galaxies contain these.
Astronomers chart these.
Altair is one of these.
Gravity holds plasma together.

Fusing hydrogen is ninety percent of what many of these do.
Friedrich Bessel was the first to directly measure the distance to one of these.
Earth has one.
Energy is produced by these.
Dwarfs last for billions of years.
Density of these varies greatly.
Constellations are made up of these.