Q. Which of the following correctly defines the term Blue straggler?

[A] A globally recognized eco-label under blue flag certification.

[B] It refers to a class of stars in open or globular clusters.

[C] A class of cyanobacteria that derive energy via photosynthesis.

[D] An encryption technique based on the blockchain technology.

Answer: B
Notes:
  • Blue stragglers are a class of stars on open or globular clusters. They stand out as they are bigger and bluer than the rest of the stars. 
  • First Discovered by: Blue stragglers were first discovered by Allan Sandage in 1953. 

Source: Article