Astronomy on MSN

What is the origin of the letters used in star classification?

What is the origin of the letters used in star classification? Why didn't astronomers use ABCD? J. HaldimanChicago, Illinois ...
SpaceNews

Scientists determine for the first time the chemical composition of a type of red giant star with more carbon than oxygen in its atmosphere

Researchers of the University of Granada have conducted the most complete worldwide analysis of the chemical composition and evolutionary state of a spectral type R carbon star The presence of carbon ...