system - A group of things that connect and form a coherent whole., solar system - The Sun and all the objects that orbit, or move around it., asteroid - Rocky mass that revolves around the Sun, most have uneven shapes, energy - Forceful exertion, relative - Properly related in size or degree or other measurable characteristics; usually followed by `to’, orbit - To follow a circular or elliptical path around a central body., comet - A frozen mass of ice and dust that orbits the Sun, meteor - A space rock that hits the atmosphere of the Earth. It's also another word for a shooting star., crescent - A shape that is curved, wide at its center, and pointed at its two ends, phase - A part or step in a process (one part in a series of related events or actions), exploration - What you do when you want to learn more about what's out there in the big wide world. It’s more than just a trip, it’s about discovery,

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