DE.4. Earth in Space
4.1. The Earth/Moon/Sun System
Enduring Understanding: Observable, predictable patterns of movement in the Sun, Earth, Moon system occur because of gravitational interaction and energy from the Sun.
4.1.B. The tilt of Earth's axis of rotation as it orbits the Sun points in the same direction with respect to the stars. The tilt and the orbital motion of Earth around the Sun cause variation in the amount of solar radiation striking a location on the Earth's surface which results in variation in the length of day/night and seasons. (Level: Essential)
4.1.C. Moon phases occur because the relative positions of Earth, Moon, and Sun change, thereby enabling us to see different amounts of the Moon's surface. (Level: Important)
4.1.D. The Moon is a natural satellite of Earth and is different than the Earth in size, atmosphere, gravity, and surface features. (Level: Compact)
4.1.E. Tides are caused by the gravitational interactions of the Sun, Moon and Earth. The Moon has a greater impact on tides because of its proximity to Earth. (Level: Compact)
4.2. The Solar System
Enduring Understanding: Most objects in the Solar System orbit the Sun and have distinctive physical characteristics and orderly motion.
4.2.B. The Solar System consists of comets, asteroids, planets, and their respective satellites, most of which orbit the Sun on a plane called the ecliptic. The planets in our Solar System revolve in the same direction around the Sun in elliptical orbits that are very close to being in the same plane. Most planets rotate in the same direction with respect to the Sun. (Level: Important)