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Solar System Unit
| Question | Answer |
|---|---|
| Astronomical unit | The average distance from the Earth to the Sun, about 93 million miles. Unit of Measurement. |
| Asteroid | A rocky object that orbits the sun, usually found in the asteroid belt between Mars and Jupiter. |
| Comet | A small celestial body made of ice, dust, and gas that forms a bright cloud and sometimes a tail when it gets close to the sun. |
| Composition | What something is made of. For example, a comet's composition includes ice, dust, and gas. |
| Elliptical | An oval shape. Many orbits in space, like the paths of planets around the Sun, are elliptical |
| Gravity | The force of attraction between two objects. The force of gravity is proportional to the mass of the two objects and their distance. |
| Kuiper Belt | A region beyond Neptune filled with many small, icy bodies, including dwarf planets like Pluto |
| Meteor | A small particle from space that burns up as it enters Earth's atmosphere, often seen as a shooting star |
| Meteoroid | A small rock or particle from space before it enters Earth's atmosphere. |
| Moon | A natural satellite that orbits a planet. Earth's moon is simply called the Moon |
| Oort Cloud | A distant, spherical shell of icy objects surrounding the solar system, far beyond the Kuiper Belt |
| Orbit | The path one object takes as it revolves around another object. For example, Earth orbits the Sun |
| Revolution | the movement of an object around another object. For example, Earth revolving around the Sun. The moon revolving around Earth |
| Rotation | The spinning of an object around its axis. Earth rotates, causing day and night |
| Solar system: | The Sun and all the objects that orbit it, including planets, moons, asteroids, and comets. |
| Sun | The star at the center of our solar system, providing light and heat to the planets. |
| Terrestrial | Refers to Earth-like, rocky planets like Mercury, Venus, Earth, and Mars |
| Atmosphere | The relatively thin layer of gases that forms Earth’s outermost layer. |
| Biodiversity | The number and variety of different species in an area. |
| Habitability | the ability of a planet so support human life |
| Optimal Conditions | optimal condition" refers to the ideal combination of environmental factors that not only allow life (as we know it) to exist, but also enable it to thrive like presence of a suitable atmosphere, liquid water, energy source, proximity to the Sun |
| Proximity | nearness in space, time, or relationship. Like the proximity of the Earth to the Sun |
| Sustainability | Using a resource in ways that maintain it in a certain quantity or amount for a certain period of time. |
| Stable climate | a state where Earth's climate system maintains relatively consistent and predictable patterns |
| Physical Property | property of matter that can be observed without changing the identity of the substance. For example, color, density, composition, gravitational pull |
| Planet | It must orbit a star (Sun). It must be big enough to have enough gravity to force it into a spherical shape. It must be big enough that its gravity has cleared away any other objects of a similar size near its orbit around the Sun. |
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