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Unit 9 - Outer Space
review for Unit 9
| Term | Definition |
|---|---|
| celestial bodies | any natural body floating in the atmosphere, such as planets, comets and asteroids |
| atmosphere | mixture of gases surrounding a planet |
| gravitational pull | the pull between objects due to gravity |
| solar system | a central star and the planets, and other celestial bodies that orbit it |
| Goldilocks Principle | a planet must neither be too far away from, or too close to a galactic center to support life |
| sun | center of the solar system - plants change radiant energy from the sun into food that animals need for energy |
| accommodation | an adaptation or adjustment that allows something to occur |
| space suit | a garment worn to keep a human alive in the harsh environment of outer space |
| microgravity | the condition in which people or objects appear to be weightless |
| earth | the perfect HABITABLE planet to live on |
| ozone layer | chemicals in the air create holes in this layer allowing exposure to ultraviolet radiation |
| habitable zone | suitable or good enough to live in |
| ultraviolet radiation | invisible rays from the sun can burn the skin causing cancer |
| International Space Station | a habitable artificial satellite that orbits earth where astronauts live and conduct experiments |
| greenhouse gasses | gasses that act as a barrier to heat leaving the atmosphere - keeps our atmosphere warm enough to live on Earth |
| tidally locked | one side of the planet always faces the sun |
| star | an exploding ball of burning gas held together by gravity |
| Milky Way Galaxy | large spiral system consisting of several hundred billion stars, one of which is the Sun, and the solar system we live in |
| giant planet | primarily composed of helium and/orhydrogen, rather than rock, or other solid matter, also called Jovian planets |
| lunar eclipse | occurs when the moon moves into the Earth's shadow, causing the moon to be darkened |
| revolve | to move in a circle on a central axis |
| planet | a celestial body moving in an elliptical orbit around the sun |
| revolution | a planet's motion around the sun along its orbit (the movement of a planet around the sun) |
| constellation | a group of stars that appears to form a pattern or picture |
| orbit | the curved path of a celestial object around or spacecraft around a star, planet, or moon |
| universe | all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy |
| dwarf planet | a celestial object similar to a planet but much smaller, that orbits the sun |
| meteorite | a rock that falls to Earth from space |
| asteroid | small, rocky objects that orbit the sun |
| elipse | an orbit that is an oval-shaped path, like a slightly elongated circle |
| light year | the distance light travels in one Earth year- One light-year is about 6 trillion miles (9 trillion km) |
Created by:
Blackcat8765
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