Mercury's period of rotation is exactly _______________ of its ...

[melly21297]

Mercury's period of rotation is exactly _______________ of its orbital period.
 
  Fill in the blank(s) with correct word

Question 2

The main observable difference separating Type I and Type II supernovae is ____.
 
  a. neutrino emission
 b. iron absorption lines
 c. a difference in luminosity of several thousand times
  d. the presence or absence of hydrogen absorption lines
  e. the presence or absence of hydrogen emission lines

[kalskdjl1212]

Answer to Question 1

two thirds
two-thirds
2/3rd
2/3

Answer to Question 2

e

[melly21297]

Excellent

[amit]

Wow, this really help