What does most every living thing need to survive?
What happens if a planet is too hot?
What happens if a planet is too cold?
What is the average temperature of a planet that is "Earth distance" away from the Sun?
What is the average temperature of a planet that is "Mercury distance" away from the Sun?
What is the average temperature of a planet that is "Neptune distance" away from the Sun?
What determines where the habitable zone is located for each star?
If a planet is discovered to be in the habitable zone does that mean it has life?
How many other factors are there besides water that determine whether or not a planet can sustain life?
Which of the following is NOT criteria to be considered a viable candidate.
How many stars have Earth-sized planets in their habitable zone?
Is it possible for an planet to spin too fast for life to exist?
Can planets be too big for life to exist?
How far away is Kepler 452b?
How many of the 3 criteria for life does Kepler 452b meet?