The Drake Equation was developed by an astrophysicist named Frank Drake which tells scientist which planets would be able to habituate intelligent life base on the number of stars in the galaxy, the number of stars that are suitable with a planet in the habitable zone, amount of planets where life develops, etc.
The Habitable Zone explains the distance a planet must be from the star it is orbiting so that it can sustain water. If the planet is too close to its star then the water evaporates, but if the star is too far from its star then the water freezes.
Kepler Satellite Survey was NASA’s a survey of exoplanets, named after Johannes Kepler, to find habitable planets by measuring their transit’s in their orbit around their star.
G and K stars are the best type of stars for habitable planets to be orbiting.
M stars are still able to have a planet sustain life in its habitable zone, but because of it’s frequent flares it makes life more difficult.
Accretion is caused when a planet is bigger than twice the size of Earth and is the growth of accumulating matter.
Eccentricity is the digression of a curve.
Source: Neil DeGrasse Tyson’s Welcome to the Universe