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Seeing the Invisible: Observing the Dark Side of the Universe. Sarah Bridle University College London. What we see. What we don ’ t see. What we don ’ t see. Missing matter: Dark Matter (matter that doesn ’ t shine). What we don ’ t see. Missing energy: Dark Energy
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Seeing the Invisible: Observing the Dark Side of the Universe Sarah Bridle University College London
What we don’t see Missing matter: Dark Matter (matter that doesn’t shine)
What we don’t see Missing energy: Dark Energy (energy that is not matter) Missing matter: Dark Matter (matter that doesn’t shine)
Big Bang 5 billion years ago Today
Why is the Universe Accelerating? • Einstein’s cosmological constant • A new fluid called Dark Energy • General Relativity is wrong
Seeing the Invisible:Is there something in between us and the wall and tree?
90 years ago Eddington confirmed Einstein’s prediction during a solar eclipse
Average galaxies together to measure weak gravitational shear
Typical galaxy used for lensing Typical star used for finding telescope response
The Invisible The Visible