For a white dwarf to explode entirely as a Type I supernova, its ...

[penza]

For a white dwarf to explode entirely as a Type I supernova, its mass must be
 
  A) at least 0.08 solar masses.
  B) 1.4 solar masses, the Chandrasekhar limit.
  C) 3 solar masses, the Schwartzschild limit.
  D) 20 solar masses, the Hubble limit.
  E) 100 solar masses, the most massive known stars.

Question 2

Which of these was NOT seen telescopically by Galileo?
 
  A) sunspots
  B) Venus' phase cycle
  C) stellar parallax
  D) four moons around Jupiter
  E) craters and mare on the Moon

[nmyers]

Answer to Question 1

B

Answer to Question 2

C

[penza]

TYSM

[olderstudent]

Gracias!