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- Kelvin scale
- a temperature scale that directly scales with the random
motion energy of a substance, such that 0 Kelvin is at absolute zero (state where all
random motion ceases) and higher temperatures have non-zero Kelvin values. It scales
like the metric system's Celsius scale for increasing temperatures---every degree
interval of the Kelvin scale corresponds to the same change
in the random motion energy as a degree interval of the Celsius scale: # Kelvin =
# Celsius - 273.
- Kepler's 1st law
- orbits are ellipses with the central object at one
focus (not the center!). There is nothing at the other focus.
- Kepler's 2nd law
- a line between the satellite and the central object
sweeps out equal areas in equal intervals of time. A satellite moves faster when it
is closer to the massive body it orbits and moves slower when farther from the
- Kepler's 3rd law
- for an object in an elliptical orbit around a
massive body, the square of the orbital period is proportional to
the cube of the average distance of the orbiting object from the massive body.
The massive body's mass is proportional to the (average
period)2. In general,
for two objects orbiting a common point between them, their
combined mass is
proportional to: (average distance between them)3/(their orbital
- unit of mass in the metric system.
- kinetic energy
- the energy something has because of its motion =
- Kuiper Belt
- a disk of comets beyond Neptune's orbit
(or 30 to 100+ A.U.) that orbit roughly in the same plane as the planets.
Many of the short period comets come from
the Kuiper Belt.
Glossary links (select a letter for definitions of astronomy terms
beginning with that letter):
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
last updated: 27 May 2001
Is this page a copy of Strobel's
Author of original content: