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Gr 6 SC Ch 4B
Gr 6 Science
| Term | Definition |
|---|---|
| orbit | to revolve around |
| ellipse | a symmetrically shaped oval |
| foci | the two special points in an ellipse |
| astronomical unit | the distance between the earth and the sun; equal to 93 million miles |
| gravity | the force of attraction that exists between any two objects |
| planets | the largest heavenly bodies that orbit the sun |
| solar system | the sun and all the heavenly bodies that orbit it |
| solar year | the time required for the earth to complete one revolution around the sun; equal to 365.25 days |
| atmosphere | the blanket of air that makes the earth hospitable for living things |
| ozone layer | a region of the atmosphere, located between 10 and 30 miles above the earth's surface, that filters out most of the harmful ultraviolet radiation from the sun |
| greenhouse effect | the ability of the earth's atmosphere to retain heat around the earth |
| maria | "seas"; large, dark-colored plains on the surface of the moon |
| lunar month | the time it takes for the moon to complete a full cycle in its orbit around the earth |
| near-earth asteroids | a group of asteroids located in the inner solar system, many of which cross paths with the earth |
| period | the time it takes for a comet to complete an orbit around the sun |
| Johannes Kepler | discovered that the planets do not travel in perfect circles, but in ellipses |
| Nicolaus Copernicus | presented the idea that all the planets orbit the sun, and that the earth itself is also a planet |
| Sir Isaac Newton | discovered the law of universal gravitation |
| Claudius Ptolemy | presented the idea of an earth-centered universe |
| 1. Mercury 2. Venus 3. Earth 4. Mars 5. Jupiter 6. Saturn 7. Uranus 8. Neptune | name the planets in order from closest to the sun outward |
| revolution | a single trip around the sun (or other heavenly body) |
| rotation | the spinning of the earth (or other object) |
| spring tide | an especially high or low ocean tide that occurs during a new moon or a full moon, when the sun and moon are in line with the earth and their gravitational forces are working together |
| neap tide | a weaker ocean tide that occurs during a first-quarter moon and a third-quarter moon, when the gravitational forces of the sun and moon work at right angles against each other |
| solar eclipse | occurs when the earth's moon passes in front of the sun, blocking the sun's light |
| lunar eclipse | occurs when the moon passes through the earth's shadow, causing the moon to appear darkened |
| asteroid | a small, rocky object that orbits the sun |
| comet | an asteroid-sized object consisting of rock, dust, and ice, that develops a huge, bright tail when it comes near the sun |
| asteroid belt | a region between Mars and Jupiter where most asteroids are located |
| Kuiper belt | a region farther from the sun than the planet Neptune where a large number of objects resembling comet nuclei are located |
| meteoroid | piece of space debris that is smaller than the smallest asteroids |
| meteor | space particle traveling within the earth's atmosphere |
| meteorite | a meteor that has landed on the earth's surface |
| 1. every planet orbits the sun in an ellipse, with the sun and an empty point in space as the foci 2. as a planet moves closer to the sun, it travels faster; as it moves farther away, it slows down 3. shows the relationship between a planet's distance from the sun and the time it takes the planet to complete one orbit | three laws of planetary motion |
| new moon, crescent phase, first-quarter moon, gibbous phase, full moon, gibbous phase, third-quarter moon, crescent phase and back to new moon | the phases of the moon |
| nucleus, coma, and tail | three parts of a comet |
| high tide | when the water of the ocean rises, or moves up the shore, until it reaches the highest point; when the coastlines are line with the moon |
| low tide | when the water of the ocean falls, or moves away from the shore, until it reaches its lowest point; when the coastlines are NOT in line with the moon |
| near-earth asteroids | a group of asteroids found in the inner solar system, many of which cross paths with Earth |
Created by:
timberswartz05