Gravity - a force that pulls one object toward another object ** Earth’s gravity always pulls objects toward the planet’s center., Revolution - the motion of one object around another, How do the Earth, sun, and moon move as a system? - The Earth revolves around the sun and (at the same time) the moon revolves around the Earth., Star - ball of hot gas that gives off light and other energy, Sun - appears larger than other stars, because it is the star closest to Earth, Apparent Brightness - light appears brighter because of its distance from the viewer, Rotation - spin around **The Earth rotates on its axis!, How long does it take for the Earth to rotate one time? - 24 hours **This is why we have day and night!, Apparent Motion - motion that seems to happen **It appears as if the sun is rising and setting (moving), but it is really the Earth that is moving!, Orbit - the path a revolving body follows around another object in space, Phase - The moon phases are how the moon appears from Earth., Constellations - a group of stars that forms a particular shape in the sky and has been given a name, What causes the seasons? - Earth’s tilt on its axis and its revolution around the sun causes the seasons., Shadows - Shadows are long in the morning. As the day goes on, the shadows shorten and then become long again. At noon (the middle of the day), they are the shortest!, Seasons and Hemispheres - When it is summer in the northern hemisphere, it is winter in the southern hemisphere, and vice versa., Moon Movements - Because the Earth is rotating, it looks as if the moon is rising in the east, moving across the sky, and setting in the west., Moon Shapes (Phases) - Because the moon is revolving around the Earth, it looks as if its shape is changing from day to day.,

Science Q4

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