space medium True/False

The cosmological constant Λ represents vacuum energy density driving accelerated expansion.

  1. True
  2. False

Answer: True

Λ in Einstein's equations corresponds to constant energy density of empty space; observational evidence favors ΛCDM model with Ω_Λ≈0.7.

Topic Astronomy - Cosmology
Exam Relevance SSC General Science, UPSC Prelims
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