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Dark Matter and Dark Energy
Transcript of Dark Matter and Dark Energy
DARK MATTER AND DARK ENERGY
Cindy and Melina
Discovery of that the
expansion is accelerating..
cosmological constant --> Lambda
Astronomers discovered: instead of slowing down universe is expanding faster
Determine whether the universe would expand forever or would someday reverse and collapse
Stars looked dimmer as expected and were therefore seemingly further away
Something was pushing down on the universe making it expand faster
cannot be directly observed
observations of gravitational interactions between astronomical objects.
--> empty space = own energy
--> as more space emerges, more energy is added
--> increasing expansion
theory longest seen as false
scientists thought: gravity would slow down or stop the expansion of the universe
--> DARK ENERGY
Dark energy and dark matter
easy to confuse dark matter and dark energy
may be related --> but no one knows
dark matter pulls matter inward
dark energy pushes matter outward
hypothetical type of matter
cannot be detected using EM-radiation
makes up 26% of the universe
How do we know Dark Matter exists?
1. Orbital speed more or less the same in entire universe
2. Gravitation too high for the visible matter
3. Gravitational Lensing
Past, Present, Future
Future of the Universe
Brian Paul Schmidt
We know dark energy is counteracting on gravity..
Four Expansion Patterns