jul 272012
 
The Brightest Stars Have a Close Companion

A new study using the European Southern Observatory’s (ESO) Very Large Telescope (VLT) has shown that most very bright high-mass stars, which drive the evolution of galaxies, do not live alone. Almost three-quarters of these stars are found to have a close companion star, far more than previously thought. Surprisingly most of these pairs are [continue reading]

mei 162012
 
Ancient Egyptian Astronomers Observed A Variable Star

  The study of the ‘Demon star’, Algol, made by a research group of the University of Helsinki, Finland, has received both scientific and public attention. The period of the brightness variation of this eclipsing binary star has been connected to good prognoses three millennia ago. Papyrus Museum, Cairo, Egypt. The oldest Egyptian calendar. The [continue reading]