Searching for Black Holes
The mass of the Sun?
Kepler's third law
Adding up masses
How does gravitational force change?
It decreases!
Centrifugal force
Orbital velocity
Rotation curves
Weighing the galaxies
Doppler shift
Spiral galaxies
Actual rotation curves of four spiral galaxies
Dark matter
Elliptical galaxies
Dark matter distribution
Mass to light ratio
Mass to light w/in orbit of Sun
Super massive black hole?
The local group (roughly to scale)
Galaxy clusters
