Can't you see he has better things to do like fly on super cool rocket boosters? Gee. Obvious.
Anyway back on Earth, After doing some past paper questions...there are important "Exam style answers" that are worth remembering as they crop up multiple times in our IB Galaxy.
Remember these word for word...
1.) Luminosity: the total energy emitted by the star per second.
Alternatively: the power emitted by the star
2.) 2 factors affecting Luminosity: 1. Temperature 2. Surface Area
3.) Cepheid Variables have a periodically changing luminosity because:
-The outer surface expands and contracts periodically
-As luminosity is directionally proportional to surface area
-This means luminosity increases and decreases periodically
4.) Apparent Brightness: The incident power per unit area received on the surface of the Earth
5.) Apparent Magnitude: A measure of how bright an object appears from Earth
(Good to know but not needed: it is a comparative scale)
6.) Absolute Magnitude: The apparent magnitude when observed at a distance of 10 parsecs
Alternatively: a measure of how bright the object appears from 10 parsecs away. (I recommend the first definition using apparent magnitude...easier to remember)
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