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Dark Matter
undetected form of mass that emits little or no light infer from gravitational influence 90% mass of universe is dark matter detectable only through gravitational forces on luminous matter (gas and stars) TERM 2
Dark Energy
DEFINITION 2 source of repulsive force causing expansion of universe to accelerate TERM 3
Content of Universe
DEFINITION 3 Normal Matter - 4. dark matter - 23% dark energy - 73% TERM 4
Orbital Velocity
DEFINITION 4 found to measure mass TERM 5
Rotation Curves
DEFINITION 5 Speed of rotation from center planets in our solar systemm: dramatic fall of curves means orbital speed decreases with distance milky way: flat curve so speed remains large at large distances
Evidence of Dark Matter
galaxy velocities are too large in cluster X-ray emitting gas in cluster Gravitational Lenses distorts view of galaxies TERM 7
Gravitational Lensing
DEFINITION 7 bends light due to gravity of galaxy clusters TERM 8
What is dark matter made of?
DEFINITION 8 WIMPS (nonbaryonic) MACHOS (baryonic) TERM 9
MACHOS
DEFINITION 9 MASSIVE COMPACT halo objects atoms, protons, neutrons brown dwarfs, black holes, black dwarfs, cold neutron stars etc. when passing in front of a star, it suddenly brightens TERM 10
WIMPS
DEFINITION 10 weakly interacting massive particles non baryonic matter neutrinos unknown particles
Accelerating
dark energy exists overpowers gravity and accelerates with time
