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Space
| Term | Definition |
|---|---|
| Satellite | an object, natural (like the Moon) or artificial (man-made spacecraft), that orbits a larger celestial body |
| Meteor | the bright streak of light, often called a "shooting star," seen when a small piece of space debris (a meteoroid) |
| Asteroid | No asteroid is currently known to be on a definite collision course with Earth in the near future |
| Comet | a small, icy Solar System body that releases gas and dust as it warms near the Sun |
| Meteorite | a piece of space rock (from an asteroid, comet, or meteoroid) that survives its fiery passage through a planet's atmosphere and lands on the surface, |
| Meteoroid | a small, rocky or metallic body (from dust grain size up to about 1 meter) traveling through outer space, often debris from asteroids or comets, |
| Gravity | the fundamental force of attraction between any two objects with mass or energy |
| Telescope | optical instruments that use lenses, mirrors, or a combination of both to observe distant objects by gathering and focusing light or other electromagnetic radiation |
| Orbit | the curved, repeating path an object takes around a central body due to gravity |
| Revolution | a fundamental, often rapid, and significant upheaval that overthrows an established system (government, social structure, technology, or economy) to create radical change, typically driven by mass mobilization against perceived failures or oppression. |
| Rotation | the circular movement of an object or figure around a central point or axis. |
| Axis | a reference line, most commonly the horizontal x-axis and vertical y-axis on graphs for coordinates, but also the rotational axis of Earth (poles) or the orientation (degrees) of astigmatism correction on an eye prescription (0-180°), indicating lens |
| Dwarf planet | a celestial body orbiting the Sun that's massive enough to be nearly round but hasn't cleared its orbital path of other debris |
| Tide | periodic rise and fall of sea levels |
| Equinox | the moment the Sun crosses the celestial equator, marking the start of astronomical spring in the Northern Hemisphere and autumn in the Southern |
| Solstice | an astronomical event that occurs twice a year when the Sun reaches its highest or lowest point in the sky relative to the celestial equator. |
| Waxing | a temporary hair removal method that involves removing the entire hair shaft from the root by applying a sticky substance, such as wax, and then pulling it off. |
| Waning | Waning is an adjective or verb form that describes something gradually decreasing in strength, intensity, size, or importance. It is most commonly used in the context of the lunar cycle but can apply to abstract concepts like influence, enthusiasm, |
| Crescent | a curved, tapering shape like a sliver of the moon, |
| Gibbous | Gibbous is an adjective most commonly used in astronomy to describe a moon or planet that is more than half illuminated but less than fully round. |
| High tide | occurs when the ocean reaches its local maximum height at a specific coastline |
| Low tide | the lowest point the sea surface reaches in a tidal cycle |
| Flood tide | the period in a tidal cycle where the water level rises from low tide to high tide, moving toward the coast. |
| Ebb tide | the period when the tide is falling, meaning the sea level recedes and water flows away from the shore, moving from high tide towards low tide |
| Tidal range | the vertical difference in height between a high tide and the succeeding low tide |
| Spring tide | a period of significantly higher high tides and lower low tides, occurring twice a month when the Sun, Earth |
| Neap tide | a period of moderate tides when the difference between high and low water is at its smallest. |
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