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Science Chapter 6
Question | Answer |
---|---|
Satellite | Is a body that orbits a planet. |
Planet | Is an object that orbits the sun, is a large enough to have become rounded by its own gravity, and cleared the area of its orbit. |
Meteors | Is a streak of light produced when a small object burns up entering Earth's atmosphere. |
Comet | Is a cold mixture of dust and ice that gives up a long trail of light as it approaches the sun. |
Star | Is a giant ball of hit gas, mainly composed to hydrogen and helium. |
Constellation | Is a pattern or group of stars that people imagined to represent a figure animal or object. |
Axis | The imaginary line that passes through Earth's center and the North and South poles. |
Rotation | The spinning of Earth on its axis. |
Revolution | Is the movement of one object around another. |
Orbit | Is a slightly elongated circle, or ellipse. |
Calendar | Is a system of organizing time that defines the beginning, length, and divisions of a year. |
Solstice | The sun appears farthest north of the equator once each year and farthest south once each year. |
Equinox | The noon sun is directly overhead at the equator, rises due east, and sets due west. |
Gravity | Attracts all objects toward each other. |
Law of Universal Gravitation | States that every object in the universe attracts every other object. |
Mass | Is the amount of matter in an object. |
Weight | The measure of the force of gravity on an object. |
Interia | The tendency of an object to resist a change in motion. |
Newton's First Law of Motion | Says that an object at rest will stay at rest and an object in motion will stay in motion with constant speed and direction unless acted on by a force. |
Phases | The different shapes of the moon you see from Earth. They are caused by the motions of moon around Earth. |
Eclipse | When an object in space comes between the sun and a third object, it casts a shadow on that object. |
Solar Eclipse | Occurs when the moon passes directly between Earth and the Sun, blocking sunlight from Earth. |
Umbra | The very darkest part of the moons shadow. |
Penumbra | The largest part of the shadow. |
Lunar Eclipse | Occurs at the full moon when Earth is directly between the moon and the sun. |
Tides | The rise and fall of ocean water that occurs every 12.5 hours or so. |
Spring tide | The combined forces produce a tide with the greatest difference between consecutive low and high tides. |
Neap Tide | The suns pull is at right angles to the moons pull. |
Maria | Are hardened rock formed from huge lava flows that occurred 3-4 billions year ago. |
Craters | Large round pits. |
Meteroroids | Chucks or rock or dust from space. |
Force | Is a push or a pull. |