The design of modern X-ray telescopes depends on: A) lenses ...

[Redwolflake15]

The design of modern X-ray telescopes depends on:
 
  A) lenses made of germanium.
  B) the prime focus design, with mirrors made of iron.
  C) grazing incidence optics.
  D) achromatic lenses to keep the X-rays in focus.
  E) the Cassegrain design, with mirrors made of lead.

Question 2

In terms of temperature alone, there are ________ terrestrial planets within the widest boundaries of the Sun's zone of habitability.
 
  Fill in the blank(s) with correct word

[recede]

Answer to Question 1

C

Answer to Question 2

three

[Redwolflake15]

TYSM

[cdmart10]

Excellent