space hard MCQ

Transmission spectroscopy during planetary transits reveals atmospheric composition by analyzing wavelength-dependent _______.

  1. Emission lines
  2. Absorption depth variations
  3. Polarization
  4. Phase curves

Answer: Absorption depth variations

Atmospheric species absorb specific wavelengths increasing effective planet size; JWST transmission spectra detect H₂O/CO₂/CH₄ in exoplanet atmospheres.

Topic Astronomy - Exoplanets
Exam Relevance UPSC Prelims, General Science
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