Distance is important
UNIT= AU astronomical units
More massive the star the hotter it is; the hotter you are the more energy you put out
The blue star represents habitable zone. Habitable zone is much closer.
Habitable zone on distance, type of star, . Fainter star has naroow habitable zone as
opposed to brighter star.
-A lot more faint stars than bright stars.
-Venus is not in habitable zone, (No tectonic activity, no plates are moving, )
-NO tectonic activity ; without it there is no carbon cycle; no carbon cycle you cannot control the
-Venus has no water in it, NO TECTONIC ACTIVITY
-Habitable planet must be larger than mars.
-Refer to graph with the number of stars and star brightness.
- Very few bright stars; many stars are fainter than the sun . The graph shows that.
-Habitable zone boundaries can change with time,
-3 bodies on the right
Earth is ha