astronomy and space chapter 1
Terms in this set (41)
What can you see in the sky?
On a clear night, you may see stars, the moon, planets, meteors, and comets.
How do objects in the sky appear to move?
The apparent motion of objects in the sky depends on the motions of earth
A body that orbits a planet.
An object that orbits the sun, is large enough to have become rounded by its own gravity and has cleared the area of its orbit.
A giant ball of hot gas, mainly composed of hydrogen and helium
The streak of light produced when a small object burns up entering Earths atmosphere
A cold mixture of dust and ice that gives up a long trail of light as it approaches the sun
A pattern or group of stars that people imagined to represent a figure, animal, or object.
How do objects in the sky appear to move? Why?
- objects in the sky appear to move from east to west because earth turns from west to east
How does earth move?
Earth moves in space in two different ways: rotation and revolution
The imaginary line that passes through earths center and the north and south poles
The spinning of earth on its axis
The movement of one object around another
A slightly elongated circle or ellipse
A system of organizing time that defines the beginning , length, and divisions of the year
What causes seasons?
Earth has seasons because it's axis is tilted as it revolves around the sun
When the sun appears farthest north of the equator once each year and farthest south once each year
When the noon sun is directly overhead at the equator, rises due east, and sets due West. This means "equal night"
A push or pull
Attracts all objects toward each other
Law of universal gravitation
States that every object in the universe attracts every other object
The amount of matter in an object
The measure of the force of gravity on an object
The tendency of an object to resist a change in motion
Newtons 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
What keeps objects in motion?
Newton concluded that inertia and gravity combined to keep earth in orbit around the sun and the moon in orbit around Earth
What causes the moon phases?
The changing relative positions of the moon, earth, and sun cause the phases of the moon
The different shapes of the moon you see from earth
The very darkest part of the Moonshadow
Occurs when the moon passes directly between earth and the sun, blocking sunlight from earth
When the moon casts another part of its shadow that is less dark then the umbra
When it object in space comes between the sun and a third object, a cast a shadow on that object
Occurs at a full moon when earth is directly between the moon and the sun
The rise and fall of ocean water that occurs every 12.5 hours or so
What are tides?
Tides are caused mainly by differences in how much gravity from the moon and the sun pools on different parts of earth
When combined forces produce a tide what's the greatest difference between consecutive low and high tides
I tied with the least difference between consecutive low low and high tideskk
What is the moon like?
The moon is dry and airless and has an irregular surface. Compared to earth, the moon is small and has large variations and its surface temperature
Dark, flat areas, are hardened rock formed from huge lava flows that occurred 3-4,000,000,000 years ago
Large round pits that can be hundreds of kilometers across
Chunks of rock or dust from space
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