The most massive main-sequence stars are the M stars. (True or false?)

The most massive main-sequence stars are the M stars.
 
  Indicate whether the statement is true or false

Question 2

A total lunar eclipse is visible only from the path of totality.
 
  Indicate whether the statement is true or false

Question 3

When we see a binary system producing eclipses, we know that the orbit is nearly edge-on.
 
  Indicate whether the statement is true or false

Question 4

The path of totality for a solar eclipse is swept out by the tip of the moon's umbra as the umbra moves over Earth.
 
  Indicate whether the statement is true or false

Question 5

We can find the masses and diameters of stars that are in eclipsing binary systems.
 
  Indicate whether the statement is true or false