Can Cepheid Variables Be Used to Map Dark Energy?

💡 The Answer

• Cepheids anchor the cosmic distance ladder needed to measure dark energy's effect.
• Precise distances to Type Ia supernovae, calibrated with Cepheids, revealed cosmic acceleration.
• The SH0ES project uses Cepheids to reduce uncertainties in the Hubble constant.
• Discrepancies in H₀ might indicate new properties of dark energy.