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Unit 2 vocab part 1
Astrnonmy
| Term | Definition |
|---|---|
| Astrnonomy | The scientific study of the universe; it includes the observation and interpretation of celestial bodies and phenomena. |
| Geocentric | Describes the concept of an earth-centerd universe. |
| Heliocentric | describes the veiw that the sun is at the center of the solar system. |
| Retrograde Motion | the apparent westward motion of the planets with respect to the stars. |
| Ellipse | an oval |
| Astronomical Unit (AU) | average distance from Earth to the sun;1.5X10^8, ,or 150 million kilometers |
| Rotation | the spinning of a body, such as Earth, about its axis |
| Revolution | the motion of one body about another, as the earth about the sun. |
| Precession | A slow motion of earth's axis that traces out a cone over a period of 26,000 years |
| Perihelion | The point in the orbit of a planet where it is closest to the sun. |
| Aphelion | The place in orbit of a planet where the planet is farthest from the sun. |
| Perigree | the point at which the moon is closest to the earth. |
| Apogee | the point where the moon is farthest from the earth |
| Phases Of The Moon | the progression of changes in the moon's apperance during the month. |
| Solar Eclipse | An eclipse of the sun; a solar eclipse occurs when the moon moves in a line directly between the earth and the sun, casting a shadow on the earth |
| Lunar Eclipse | An eclipse of the moon; A lunar eclipse occurs when the moon passes through earth's shadow. |
| Crater | the depression at the summit of a volcano or that which is produced by a meteoric impact. |
| Terrestrial planet | any of the Earth-like planets including Mercury, Venus, Mars, and Earth. |
| Jovian Planet | Jupiter-like planets: Jupiter, Saturn, Uranus, and Neptune; these planets have relatively low densities and are huge gas giants. |
| Nebula | A Clous of dust and/or gas in space. |
| Planetesimal | Small, irregularly-shaped body formed by colliding matter. |
| Asteroid | A small, rocky body which can range in size from a few hundred kilometers to less than a kilometer; the asroids orbit lie mainly between mars and jupiter. |
| Comet | a small body made out of rocky and metallic pieces held together by frozen gases; comets generally revolve around the sun in an ellongated orbit. |
| Coma | the fuzzy, gaseous comonent of a comet's head. |
| Meteoroid | a small solid, particle that travels through space. |
| Meteor | the luminous phenominon observed when a meteoroid enters earth's atmosphere and burns up, people call this a shooting star. |
| Meteorite | any portion of meteoroid that reaches earth's surface. |
| Electromagnetic Spectrum | the arrangement of electromagnetic radiation according to wavelength. |
| Photon | a small packet of light energy. |
| Spectroscopy | the study of the properties of light that depend wavelength. |
| Doppler effect | the apparent change of frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer. |
| Refracting Telescope | a telescope that uses a lens to bend and concentrate the light from distant objects. |
| Reflecting Telescope | a telescope that concentrates light from distant obejects by using a concave mirror. |
| Radio Telescope | a telescope designed to make observations in radio wavelength. |
| Hubble Telescope | a telescope in space that could see the earth from a distance at very far away. |
| Space Shuttle | a shuttle found in space that serves as a sattellite |
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_i.c.a_
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