Unit 8: Estrellas

Front

Apparent Magnitude

Back

Archaic version of brightness where the more negative the value, the brighter the star.

Front

Absolute Magnitude

Back

Archaic version of luminosity where the more negative the value, the more luminous the star.

Front

Ptolemy

Back

Greek "Astronomer" who created the magnitude system. He couldn't cope with heliocentrism, so he invented the worst system to organize stars conceivable.

Front

Brightness

Back

The amount of light visible from Earth coming from a celestial object. Measured in Watts per square meter.

Front

Main Sequence Star

Back

Over 90% of stars in the universe are this type of star. These stars fuse hydrogen into helium in their core. They are very average.

Front

Supergiant Star

Back

Not always blue. These stars fuse a combination of hydrogen, helium, carbon, neon, oxygen, silicon, and iron in their cores, causing them to be very bright and very short-lived.

Front

Hypergiant Stars

Back

Not always yellow. So large and unstable they live for very short periods of time, continuously spewing large portions of their mass into space until they die explosively.

Front

HR Diagram

Back

Hertzsprung-Russell diagram, a graph that shows the relationship between magnitudes and temperature.

Front

Annie Jump Cannon

Back

"Census Taker of the Sky" Manually classified more stars in a lifetime than anyone else for a total of around 350,000 stars.

Front

Magnitude System

Back

A system created by Ptolemy to organize stars, which was not compatible with heliocentrism.