Silver is now the third most valuable asset in the world

Spot silver's ( XAGUSD:CUR) whopping +174% rise this year has turned the metal into the third most valuable asset in the ...
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 Stellar spectral types originally followed alphabetical order. But as ...