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Unit 2 vocabulary
| Term | Definition |
|---|---|
| Astronomy | The scientific study of the universe |
| Geocentric | describes the concept of an earth centered universe |
| Heliocentric | describes the view that the sun is at the center of the solar system |
| Ellipse | an oval |
| Astronomical unit | averge distance the earth is from the sun 150 million kilometers |
| Rotation | the spinning of a body,such as the Earth, about its axis |
| Revolution | the motion of one body around the other,as Earth about the Sun |
| Precession | a slow motion of earths axis that traces out a cone over a period of time |
| Perihelion | the point in the orbit of a planet where it is closets to the sun |
| Aphelion | the place in the orbit of a planet where the planet is farthest from the sun |
| Perigree | the point at which the moon is closest to earth |
| Apogee | the point where the earth is farthest from the moon |
| Phases of the moon | the progression of changes in the moons appearance during the month |
| Solar eclipse | when the moon goes between the sun and the earth |
| Lunar eclipse | when the moon passes through the earths shadow |
| crater | the depression at hthe summit of a valcano |
| Terrestrial planet | any of the like earth planets including mars, venus and mercury |
| Jovian planet | a cloud of dust or dirt in space |
| Planetesimal | small, irregulary shaped body formed by colliding matter |
| Asteroid | a small rocky body that can vary in sizes |
| comet | a small body mad by rock and matallic pieces |
| coma | the fuzzy, gaseous component of a comets head |
| Meteoroid | a small solid particle that travels through space |
| meteor | when it enters the earths atmoshere it is commanly called a shooting star |
| meteorite | any portion of a metoroid that reaches earths surface |
| Electromagnetic spectrum | the arrangment of electromagnetic radiation according to the wave length |
| Photon | a small packet of light energy |
| spectroscopy | the study of the properties of light that depend on the wavlength |
| Doppler Effect | the apparent change in frequency of the electromagnetic or sound waves |
| Refracting telescope | a telescope that uses lens to bend bend and concentrate the light from distant objects |
| Reflecting telescope | a telescope that concentrates light from distant objects |
| radio telescope | a telescope designed to make observations in radio wavekeghts |
| hubble telescope | use multiple far objects to use light |
| space shuttle | a vechicle that alows you to travel to space |
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