The curved, yellow ________ tail lags behind the blue tail as the ...

[ahriuashd]

The curved, yellow ________ tail lags behind the blue tail as the comet rounds the Sun.
 
  Fill in the blank(s) with correct word

Question 2

Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
 
  A) Earth's rotation defines a day.
  The saros cycle of eclipses defines a month.
  Earth's orbit defines a year.
  Earth's cycle of axis precession takes 26,000 years.
  B) Earth's rotation defines a day.
  The cycle of the Moon's phases takes about a month.
  Earth's orbit defines a year.
  Earth's cycle of axis precession takes 26,000 years.
  C) Earth's rotation defines a day.
  The cycle of the Moon's phases takes about a week.
  Earth's orbit defines a year.
  Earth's cycle of axis precession defines a month.
  D) Earth's rotation defines a day.
  The Sun's rotation defines a week.
  The Moon's rotation defines a month.
  Earth's orbit defines a year.

[xiaomengxian]

Answer to Question 1

dust

Answer to Question 2

B