Earth

= Standard 6-- Compare effects of gravitational force on Earth, on the moon, and within space. = = NOTES =
 * Compare weight on Earth versus on the Moon versus in space.
 * Determine if an object weighs more or less on a more massive planet.
 * Recognize that mass is different than weight.
 * Recognize the effects of tides on Earth.
 * 1) The Moon's gravity is approximately 1/6 (one-sixth) that of Earth's. This means that things on earth weigh 6 x (times) what they would on the moon.
 * 2) The weight of an astronaut is greater on Earth than on the moon.
 * 3) If an object is sent from Earth to the Moon - the weight of the object decreases, and the mass of the object stays the same.
 * 4) The solar system is made up of the sun, its planets, natural satellites, asteroids, meteoroids, and comets. Each of these bodies are held to each other by the force of gravity.
 * 5) The sun is by far the most largest part of the solar system. . The other principal members of the solar system are the nine major planets.
 * 6) The planets are grouped according to their physical properties. The inner planets (Mercury, Venus, Earth, and Mars), are called the terrestrial (meaning earthlike) planets. They are dense and small in size. They have solid, rocky crusts and interiors of metal. Except for Mercury, they have gaseous atmospheres from which lighter elements have escaped because of the low gravitational force.
 * 7) The Jovian planets (Jupiter, Saturn, Uranus, and Neptune) all have great volume and mass but relatively low density (thickness). Pluto has sometimes been classed with the terrestrial planets, but it is more properly considered a special case. Most of the nine major planets have one or more moons.