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| a point in Earth's orbit around the sun where daylight is either longest or shortest amount possible.[image] |
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| a point in Earth's orbit around the sun where nights and days are the same length. |
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| a darkening of the moon when ti 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[image] |
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| brilliant objects in space that may be the powerhouses of developing galaxies[image] |
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| cloud of gas and dust in space[image] |
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| star that has swelled and glows with a red color[image] |
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| the explosion of a star, releaasing in huge amounts of light and other energy[image] |
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| an invisible object in space whose mass and gravitational force is so great that not even light can escape[image] |
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| the idea that the universe started a huge explosion about 15 billion years ago[image] |
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