Supernova remnants _____. a. always contain pulsars, because ...

[cagreen833]

Supernova remnants _____.
 
  a. always contain pulsars, because pulsars supply the ionizing radiation
  b. often last longer than a pulsar does, so the central pulsar may no longer be visible
 c. rarely contain pulsars, because pulsar radiation disrupts the remnant
 d. may not contain a pulsar, if the supernova explosion kicked the pulsar away at high speed
 e. never contain pulsars

Question 2

Kepler originally proposed that the planets were spaced apart by ____.
 
  a. five spheres
 b. five regular solids
  c. six tetrahedrons
 d. five epicycles
 e. six regular solids

[pami445]

Answer to Question 1

d

Answer to Question 2

b

[cagreen833]

TYSM

[kusterl]

Thanks for the timely response, appreciate it