Tycho Brahe's contribution to Kepler's Laws of Planetary Motion ...

[lracut11]

Tycho Brahe's contribution to Kepler's Laws of Planetary Motion was:
 
  A) his detailed and accurate observations of the planet's position.
  B) his observations of Jupiter's moons.
  C) a mathematical explanation of epicycles.
  D) a precise lunar calendar.
  E) the correct explanation of lunar phases.

Question 2

That we can see two images of the same quasar is due to a(n) ________ lens formed by a massive galaxy lying in front of the quasar.
 
  Fill in the blank(s) with correct word

[pratush dev]

Answer to Question 1

A

Answer to Question 2

gravitational

[lracut11]

Thank you!

[pratush dev]

Always glad to help...