Gravity, he force that pulls objects toward one another, keeping planets in orbit around stars., Constellation, A group of stars that forms a recognizable pattern in the night sky., Solar System, The collection of the Sun and all the celestial bodies that are bound to it by gravity, including planets, moons, asteroids, and comets., Revolution, The movement of one object around another, such as the Earth revolving around the Sun., Hemisphere, Half of the Earth, typically divided into northern and southern halves by the equator., Horizon, The line where the Earth and sky appear to meet, marking the limits of what we can see., Rotation, The spinning of a planet on its axis, which causes day and night., Axis, An imaginary line that runs through the center of a planet, around which it rotates., Shadow, A dark area created when an object blocks light from a source, like the Sun., Dawn, The time of day when light first appears in the morning, marking the beginning of daytime., Dusk, The time of day just before nightfall, when the sky begins to darken., Altitude, The height of an object or point in relation to sea level or ground level., Distance, The amount of space between two points, which can be measured in units like kilometers or miles., Orbit, The curved path that an object takes as it revolves around another object in space., Light Year, A measure of distance that represents how far light travels in one year, used to express astronomical distances., Planisphere, A flat map of the night sky that shows the positions of stars and constellations for a specific time and location..

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