Editing Exoplanets (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'The Transit Method' (Planet size):'''
<syntaxhighlight lang="python">
def calculate_planet_radius(star_radius_km, brightness_drop_percent):
    """
    The drop in brightness is proportional to the 
    ratio of the planet's area to the star's area.
    (Drop = R_p^2 / R_s^2)
    """
    import math
    drop_decimal = brightness_drop_percent / 100
    planet_radius = star_radius_km * math.sqrt(drop_decimal)
    
    return planet_radius

# Earth-sized planet transiting a Sun-sized star
sun_r = 696340 # km
drop = 0.0084  # percent
r_p = calculate_planet_radius(sun_r, drop)

print(f"Detected Planet Radius: {r_p:.0f} km")
# This is how we know 'Kepler-186f' is almost exactly 
# the same size as Earth.
</syntaxhighlight>

; Iconic Exoplanets
: '''51 Pegasi b''' → The first exoplanet discovered orbiting a sun-like star (1995).
: '''TRAPPIST-1 System''' → A single small star with 7 Earth-sized planets, 3 of which are in the habitable zone.
: '''Proxima Centauri b''' → The closest exoplanet to Earth (only 4.2 light years away).
: '''K2-18b''' → A "Hycean" world (ocean-covered) where water vapor and potentially life-related chemicals have been detected.
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