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| A point in earth's orbit around the sun where daylightis longer or shorter.[image] |
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| a point in earth's orbit around the sun where night and day are the same length.[image] |
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| a darkening of the moon when it passes through earth's shadow.[image] |
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| the rise and fall of the water[image] |
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| A system of billions of stars gases and dust. [image] |
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| An extremely distant, and thus old, celestial object whose power output is several thousand times that of our entire galaxy.[image] |
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| A diffuse mass of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident radiation.[image] |
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| A star of great size and brightness that has a relatively low surface temperature.
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| A rare celestial phenomenon involving the explosion of most of the material in a star, resulting in an extremely bright, short-lived object that emits vast amounts of energy.[image] |
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| An area of space-time with a gravitational field so intense that its escape velocity is equal to or exceeds the speed of light.[image] |
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