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Dark Matter and Dark Energy

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by

Cindy Kracht

on 23 May 2015

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Transcript of Dark Matter and Dark Energy

Dark energy
http://www.ted.com/speakers/patricia_burchat
http://home.web.cern.ch/about/physics/dark-matter
http://science.nationalgeographic.com/science/space/dark-matter/
http://hetdex.org/dark_energy/dark_matter.php
https://prezi.com/ieihomiyagz5/dark-matter-dark-energy-and-antimatter/
http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/
http://en.wikipedia.org/wiki/Dark_matter
https://prezi.com/nygricnazwd4/dark-matter-and-dark-energy/
http://www.dummies.com/how-to/content/the-universes-dark-matter-and-dark-energy.html
http://hetdex.org/dark_energy/discovery.php

DARK MATTER AND DARK ENERGY
Cindy and Melina
History..
Discovery of that the
expansion is accelerating..
Hypothetical..
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
Sources
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
DARK MATTER
hypothetical type of matter
cannot be detected using EM-radiation
makes up 26% of the universe
How do we know Dark Matter exists?
1.
1. Orbital speed more or less the same in entire universe

2. Gravitation too high for the visible matter

3. Gravitational Lensing
REASONS
2.
3.
Galaxies
Clusters
Gravitational Lensing
Past, Present, Future
CERN
MINNESOTA MINE
1932/3
1960s-70s
Space Probes
Future of the Universe
The astronomers..
Saul Perlmutter
Brian Paul Schmidt
Adam Riess
We know dark energy is counteracting on gravity..
Four Expansion Patterns
Full transcript