High-precision observations by the Hubble Space Telescope have ...

[Kikoku]

High-precision observations by the Hubble Space Telescope have revealed what as-yet unexplained phenomenon in globular clusters?
 
  What will be an ideal response?

Question 2

At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?
 
  A) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada
  B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally
  C) by using radio telescopes to search for signals from extraterrestrial civilizations
  D) by using X-ray telescopes to search for exhaust from interstellar spacecraft
  E) by searching for planets around distant stars

[xthemafja]

Answer to Question 1

There appear to be three distinct main sequences with differing amounts of helium, carbon, and nitrogen. Scientists are unable to explain how these different stars could have formed in the time available.

Answer to Question 2

C

[Kikoku]

YES! Correct, THANKS for helping me on my review

[kjohnson]

Great answer, keep it coming