Spacecraft have landed on all the terrestrial worlds except A) ...

[james9437]

Spacecraft have landed on all the terrestrial worlds except
 
  A) Mercury.
  B) Venus.
  C) Moon.
  D) Mars.
  E) Spacecraft have landed on all of the terrestrial worlds.

Question 2

In essence, most of the extrasolar planets discovered to date have been found by
 
  A) closely examining very high-resolution photographs of other star systems.
  B) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet.
  C) identifying spectral lines that look like what we expect to see from a planet rather than a star.
  D) observing mini-eclipses of a star as an unseen planet passes in front of it.

[lou]

Answer to Question 1

E

Answer to Question 2

B

[james9437]

Gracias!

[parker125]

Thanks for the timely response, appreciate it