An astronomer examining a compact object could conclude that it ...

[Destiiny22]

An astronomer examining a compact object could conclude that it was a black hole if it _____.
 
  a. emits regular pulses of radiation
 b. has a defined event horizon that emits X-rays
  c. has an accretion disk
 d. has a mass greater than 1.4 solar masses
 e. has a mass greater than 3 solar masses

Question 2

Which statement best describes a theory?
 
  a. A group of ideas about how something should be done, made, or thought about
 b. A specific statement about nature that needs further testing
 c. An idea considered so obviously true that the idea does not need to be questioned
 d. A fundamental principle in which scientists have great confidence
 e. A general description of some aspect of nature that has been thoroughly tested and widely accepted

[Rilsmarie951]

Answer to Question 1

e

Answer to Question 2

e