📖 what
What is cosmic shear?
CosmologyWeak Lensing
Quick Answer
Cosmic shear is the tiny distortion in the shapes of distant galaxies caused by weak gravitational lensing. It helps astronomers map dark matter across large scales.
The Full Story
Cosmic shear is a statistical effect: the light from many background galaxies is subtly stretched by the gravity of intervening mass. Because the distortion is very slight, astronomers need large surveys and careful analysis to detect it. Measurements of cosmic shear help trace the distribution of dark matter and study how structure has grown over cosmic time. It is a major tool in modern observational cosmology.
Key Facts
1.It is a weak-lensing effect
2.It uses statistical shape distortions
3.It helps map dark matter
YouTube Angle
Suggested video title for this topic:
"The Universe’s invisible fingerprint on the shapes of galaxies"