Term
| What does the universe consist of? |
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Definition
| all space and the matter space contains |
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Term
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Definition
| The study of all physical objects beyond earth. |
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Term
| How do the sun,moon,and stars move? |
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Definition
| They move in cycles. The observations of these cycles led to calendars. |
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Term
| What does a year represent? |
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Definition
| It represents the time required for the earth to revolve around the sun |
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Term
| What does a month represent? |
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Definition
| It represents the estimated amount of time required for the moon to revolve once around earth |
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Term
| What does a day represent? |
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Definition
| It represents the time required for the earth to rotate once on its axis |
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Term
| Which calendar had 365 days, and worked well until the seasons ekpt coming later and later each year? |
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Definition
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Term
| Who developed the Julian calendar that was based on a 365.25-day calendar year and added a day every four years? |
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Definition
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Term
| What is a year where an extra day is added? |
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Definition
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Term
| Who developed the Gregorian calendar which restricted leap years toyears that are divisable by 4 but not by 100(except years taht are divisible by 400) |
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Definition
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Term
| What is the most common calendar used today? |
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Definition
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Term
| What are the provisions of the Ptoemaic theory? |
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Definition
| Created by Claudius Ptomley, the Earth is at the center of the universe, the sun and other planets revolved around the earth, it was incorrect but predicted mothions of the planets better than any known method at the time |
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Term
| What is the provisions of Copernicus's theory? |
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Definition
| The sun is at the center of the universe, and the planets revolved around the sun, although he was correct it was slow to replace Ptomely's theory |
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Term
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Definition
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Term
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Definition
| He used large tools to study the sky, he favored Copernicus's theory, but believed that other planets revolved around sun but the sun and moon revolved aroudn the earth, recorded very exact data on the postitiosn of celestial bodies |
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Term
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Definition
| Tycho's assistant, after review data of Brahe he annouced new laws of planetary motion, all planets revolove aroudn the sun and they do so in an ellipse, so the sun is not the exact center of their orbital paths |
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Term
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Definition
| was the first person to use the telescope, descovered 4 moons orbiting jupiter,craters on teh moon, and sunspots, favored Copernicus's theory |
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Term
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Definition
| explained why planets revolve around the sun and why moons revolve around planets:gravity,brought together works of all of the astronomers |
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Definition
| discovered that our universe is much larger than we believed at the time |
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Term
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Definition
| an instrument that collects light and concentrates it for better observation |
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Term
| What does an objective lens do? |
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Definition
| it collects light and forms an image at teh back of a telescope |
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Term
| Waht is a refracting telescope? |
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Definition
| use a set of lensses to gather and focus light |
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Term
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Definition
| use curved mirrors to gather and focus light |
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Term
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Definition
| point on axis of a mirror through which paralell light rays are focused |
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Term
| electromagnetic radiation |
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Definition
| includes all forms of energy that traves through space as waves |
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Term
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Definition
| all the wavelenghts of electromagnetic radiation |
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Term
| what does our atmosphere block |
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Definition
| some types of electromagnetic radiationx |
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Term
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Definition
| large groups of stars in space |
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Term
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Definition
| buldge at center,spiral arms,rotating,nebulas,open clusters, milky way is |
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Term
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Definition
| spherical,elongated,old stars, little dust and gas, bright centersglobular cluster |
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Term
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Definition
| dont fit in other class, irregular shape,close to spiral galaxies, |
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Term
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Definition
| giant clouds of gas and dust, some absorb light, some reflect,new stars form here,spiral galaxies |
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Term
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Definition
| groups of old stars, spiral galaxies,elliptical |
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Term
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Definition
| groups of stars located on the sprial arm of spiral galaxies |
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Term
| why is looking in deep space liek looking back in time |
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Definition
| light taeks years to get here so we are seeing the light that happened oh so many years ago |
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Term
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Definition
| distant, star like sources of light that are extremely far away,powerful,core of young galaxies in the process of forming |
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Term
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Definition
| the distance that light through space in one year |
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Term
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Definition
| the stud yfo the origin, structure,and future of the universe |
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Term
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Definition
| all the matter came to one tiny spot came together under pressure temperature and density. then it rapidly expanded and matter come together and form galaxies. the universe that the universe began with a trmedous explosion |
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Term
| cosmic backround radiation |
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Definition
| radiation coming from all directions in space, supports the bbt |
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Term
| list onway si can calculate the age of the universe |
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Definition
| measure the distant from earth to various galaxies and predict its rate of expantion, calculate the ages of old, nearby stars, not consistent with the bbt |
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Term
| what will teh happen to our universe in the end |
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Definition
| galaxies will get older and stop forming the stars, if enough matter is in space gravity could stop expansion and start to collapse, if not the universe would become cold and dark |
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Term
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Definition
| sections of the sky that contain recognizeable star patterns |
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Term
| how many constellations in the sky |
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Definition
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Term
| whthappens as the earth revolvaes the sun |
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Definition
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Term
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Definition
| stars that can be seen at all times of teh year and all times of night,appear to circulating because of earths rotation, other non circumpolar appear to rise above and set below the horizon |
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Term
| how fast is the speed of light |
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Definition
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Term
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Definition
| different elements, hot very dense atmosphere gases absorb soem of the light |
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Definition
| a rainbow of colors ROY G BIV |
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Term
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Definition
| a object that c=shows all the colors |
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Term
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Definition
| breaks light into spectrum,reveals emission lines, |
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Term
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Definition
| ljines that are meade whe certain wavelenthgs are colors are given , each element has its own set of el |
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Term
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Definition
| produced when light from a hot solid passes through a cooler gas, dark lines |
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Term
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Definition
| by hotness, postive # for dimmer * and negative # for brighter * |
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Term
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Definition
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Definition
| influced by distance, the actual brightness of a * |
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Term
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Definition
| a * apperant shift in postition |
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Term
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Definition
| the tilt of the earth and revolution aroudn the sun |
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Term
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Definition
| graph showing the relationship between a * surface temp and its absolute magnitdue or luminosity |
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Term
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Definition
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Term
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Definition
| small hot stars leftover centers of old * very hot in left bottom corner of hr diagram |
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Term
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Definition
| * that expands and cools when it runs out of hydrogen |
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Term
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Definition
| not in main sequence very long ,large , quickly use up hydrogen |
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Term
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Definition
| bottom right corner on hr diagram,low mass, live for a long time, oldest *s in galaxies |
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Term
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Definition
| the death of a large * by explosion, very bright,elements are formed |
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Term
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Definition
| all the particles of a * have turned into nuetrons (charged particales form neutrons) |
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Term
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Definition
| spinning neutron *, and obj with 3+ x the amss of the sun squeezed into a bal only 10 km across, strong gravity that it pulls in some other galaxies dust |
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Term
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Definition
| the spin of a body on its axis |
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Term
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Definition
| the motion of a body taht travels around another body in space one complete trip along a =n orbit |
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Term
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Definition
| a division of the year that is characterized by recurring weathr conditions and determineed byu boths earths tilit to the sun and eaths position in its orbit aroung the sun |
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Term
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Definition
| the point at which the sun is far noth or as far south of the wquatpr as possible |
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Term
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Definition
| the moment when the sun appears to cros the celestial equator |
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Term
| the speed at which you are traveling while earth rotates depends on ___you are |
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Definition
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Term
| what direction does earth rotate onit axis |
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Definition
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Term
| how many days are there during the year when every location on earth gets 12 hrs of darkness |
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Definition
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Term
| what do we call those 2 days of 12 hr darkness |
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Definition
| equinoxws and they mark the beginning of spring and fall |
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Term
| althogh all the locations receive the same hrs of sunlught they dont all the same amount of_____ |
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Definition
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Term
| why dont they all recive the same solar energty |
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Definition
| earths curvature casue the intestity of sunlihgt to be different at different locations |
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