Equations

Question 1

Equation for Kepler’s Third Law

Answer 1

p^2 = a^3

p = planet’s orbital period in years
a = semi-major acid in AU

Question 2

Newton’s Universal Law of Gravity

Answer 2

F = GMm/r^2

F = force of gravity
G = “big G”
M = bigger mass
m = smaller mass
r = radius; distance between centers of big and small masses

Question 3

Newton’s Version of Kepler’s Third Law

Answer 3

M * P^2 = 4pi^2 / G * a^3

Question 4

What does AU stand for?

Answer 4

Astronomical Unit - Distance from the Sun to the Earth

Question 5

Value for Speed of Light

Answer 5

3.00 * 10^8 m/s

Question 6

Brightness of Stars (to Determine Distance to Stars)

Answer 6

B = L / 4piD^2
Brightness = Luminosity/(Distance)^2

Question 7

Stefan-Boltzmann Law

Answer 7

L = 4piR^2óT^4