Astronomical Laws
Hubble's Law
- The farther away a galaxy is, the faster it is moving away from us.
- V = H x d
- H is called Hubble's constant. Its value is 72 km per second per Mpc.
V is the velocity
d is the distance
Kepler's Laws
- Each planet moves round an ellipse of which the sun is one focus.
- The line joining the sun to the planet sweeps out area at a constant rate.
- The sidereal periods of the planets are proportional to their mean distance from the Sun raised to the one-and-one-half power (d1½).
