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| A point in Earth's orbit around the the sun where daylight is either the longest or the shortest amount possible. |
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| A point in Earth's orbit around the sun where nights and days are the same legnth. |
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| A darkening of the moonwhen it passes through Earth's shadow. |
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| The rise and fall of water in the ocean and seas caused mainly by the gravitational pull of the moon on Earth. |
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| A system of billions of stars, gases, and dust. |
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| Brilliant objects in space that may be the powerhouses of developing galaxies. |
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| Cloud of gas and dust in space. |
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| A star that has swelled and glows with a red color. |
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| The explosion of a star, releasing huge amounts of light and other energy. |
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| An invisible object in space whose mass and gravitational force is so great that not even light can escape. |
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| The idea that the universe started a huge explosion aboot 15 billion years ago. |
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