Answer:
Director Alfonso Cuarón wrote the screenplay for the movie Gravity with his son Jonàs.
Step-by-step explanation:
"Director Alfonso Cuarón wrote the screenplay for the movie Gravity with his son Jonàs." is the fact because it doesn't say "about" like the other sentence. This is a true statement and not an opinion or estimate.
"The movie Gravity, starring actors Sandra Bullock and George Clooney as astronauts, is about twenty minutes longer than it should be." is not the fact because it says about. People may have a different opinion on if it is about 20 minutes longer than it should be. They may say: "it's actually closer to 21 minutes not 20." or a statement similar.