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 ...

The first observer to catalog differences in star brightnesses was Greek astronomer Hipparchus. He created a catalog around 135 B.C.E. of roughly 850 stars divided into six ranges. He called the ...

The brightest planet as seen from Earth is Venus, which has an average V-band apparent magnitude of -4.14, making it the second-brightest object in the night sky after the Moon. Apparent and absolute ...

This is an A-level worksheet from Flipped Around Physics, on absolute magnitude. Worksheet answers are available from the Flipped Around Physics website. The worksheet is designed to be used in a ...