The possible effect on climate of variations in the Sun's total power output, or luminosity, has interested the scientific and financial communities since at least William Herschel's ...

A glance at the night sky above Earth shows that some stars are much brighter than others. However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers ...

A glance at the night sky above Earth shows that some stars are much brighter than others. However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers ...