Which statement about extrasolar planets found to date is true? ...

[khang]

Which statement about extrasolar planets found to date is true?
 
  A) All are terrestrials, comparable in size to Earth.
  B) All lie more than 2 AU from their star.
  C) Most have orbital periods of more than a year.
  D) Some are so close to their stars that their periods are just a few days.
  E) Few are found by Doppler shifts of their stars, due to their gravity.

Question 2

What are the minimum and maximum values for declination in the sky for both north and south?
 
  What will be an ideal response?

[guyanai]

Answer to Question 1

D

Answer to Question 2

From the equator at 0 degrees, to +90 degrees for the north celestial pole, and down to -90 degrees for the south celestial pole.

[khang]

Thank you!

[guyanai]

Always glad to help...