# Astronomy Vocab

### 26 terms by racdavis

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Yak period 7/8 earth science honors check out cayleys presentation: http://docs.google.com/Presentation?id=dgtjph37_1254g77nd3

### Asteroid

A solid rocky and or metallic body that independently orbits the sun

### Big Bang Theory

States that all matter and energy started out concentrated in a small area and, after a gigantic explosion, matter began to organize into subtonic particles and atoms

### Celestial object

Any object outside or above Earth's atmosphere

### Comet

A low density object made of ice that turns to gas as it nears the sun

### Doppler effect

The shifting of wavelengths

### Eccentricity

The degree of ovalness of an ellipse, or how far an ellipse is from being a circle; computed using a formula

### Ellipse

A closed curve around two fixed points called foci, in which the sum of the distances between any point of the curve and the foci is a constant

### Focus

In an ellipse, either of two fixed points located so that the sum of their distances to any point on the ellipse is constant

### Galaxy

A collection of billions of stars and various

### Gravitation

The attractive force that exist between any two objects in the universe; proportional to the product of the masses of the objects and inversely proportional to the square of the distance between their centers; also called gravitational force

### Impact crater

Meteorites that have sufficient mass to create a depression in Earth's crust

### Impact event

When objects collide with the planets because of gravitational pull

### Inertia

The concept that an object at rest will tend to remain at rest and that an object in motion with maintain the direction and speed of that motion unless an opposing force affects it

### Jovian planets

Far from the sun and have very large masses

### Luminosity (of a star)

Measures how bright the star will be in relation to the sun if all stars were the same distance from the observer

### Meteor

Very small solid fragment that orbit the sun

### Milky Way Galaxy

Our solar system is part of this spiral shaped galaxy

### Moon

A body that orbits a planet or an asteroid as those objects orbit the sun

### Nuclear fusion

The combining of the nuclei of smaller elements to form the nuclei of larger elements with some of the mass being converted into energy

### Red shift

When earth and other celestial objects are moving apart and the electromagnetic waves are spread out

### Revolution

A planets movement around the sun in a path called an orbit; the movement of one body around another in a path called an orbit

### Rotation

The spinning of an object, such as a planet, moon, or star, on an imaginary axis- like a top

### Solar system

Any star or small group of orbiting stars and all the other objects that revolve around the star

### Star

Usually a large ball of gas held together by gravity that produces tremendous amounts of energy and shines

### Terrestrial planets

Close to the sun and mostly solid and are high in density

### Universe

Everything that exists in any place

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