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| the actual brightness of star |
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| the angle between an object in the sky and the horizon |
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| how bright a light appears to be |
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| human made object that orbits a body in space |
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| the region of the solar system most asteroids occupy; roughly between mars and jupiter |
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| distance between earth and sun |
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| study of all things beyond earth |
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| a mixture of gases that surround a planet |
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| the theory that states the universe began with a tremendous explosion |
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| hole is space with more than three solar masses, but only ten km across... it is so dense not even light can escape |
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| a thin region of the suns atmosphere between the corona and photosphere; too faint to see unless there is a total solar eclipse |
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| a small body of rock, ice, and cosmic dust loosely packed togetherthat gives off gas and dust in the form of a rtail as it passes close to the sun |
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| a section of the sky that contains a recognizable star pattern |
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| a region of the sun where gases circulate in convection currents bringing the suns energy to the surface |
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| the suns outer atmosphere which can extend an outward distance equal to 10-12 times the diameter of the sun |
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| study of the universes past and present |
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Definition
| thin, outermost part of earth, or the uppermost part of the lithosphere |
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| the time required for the earth to rotate around its axis |
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| a measure of how far north or south an object is from the celestial equator |
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Definition
| an event in which the shadow of one celestial body falls on another |
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| the apparent path the sun takes across the celestial sphere |
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| electromaagnetic spectrum |
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Definition
| all the wavelegnths of electromagnetic radiation |
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Definition
| a closed curve in which the sum of the distance from the edge of the curve to two points inside the ellipse is always the same |
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| a spherical or elongated galaxy with a bright center and very little dust |
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| a large group of stars in space |
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| a group of older stars that looks like a ball of stars |
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| the line where the sky and earth meet |
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| hertzsprung russel diagram a graph that shows the relationship between a stars surface temperature and its absolute magnitude |
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| a galaxy that does not fit into any other category |
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| the region of the solar system outside the orbit of neptune that is occupied by small icy comet like bodies |
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| an event in which the shadow of the earth falls on the moon |
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| a dialouge pattern of stars on the hr diagram |
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| the layer of the earth between crust and core |
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| a streak of light caused when a meteoroid or comet dust burns up in the earths atmosphere before it reaches the ground |
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| a meteoroid that reaches the earths surface without burning up comepletely |
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| a very small rocky body that revolves around the sun |
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Definition
| a large cloud of dust and gas in interstellar space location of star formation |
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| a star in which all particles have become neutrons, the collapsed remains of a super nova |
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Definition
| the process by which two or more nuclei with small masses join together, or fuse, to form a larger, more massive nucleus, along with the production of energy |
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| a spherical region of space that surrounds the solar system in which distant comets revolve around the sun |
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| a group of stars that are usually located along the spiral disk of a galaxy |
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| the elliptical path a body takes as it travels around another body in space, the motion itself |
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| an apparent shift in the position of an object, when viewed from different locations |
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| the different appearances of the moon due to varying amouts of sunlight on the side of the moon that faces the earth, results from the changing relative positions of the moon, earth, and the sun |
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| the layer of the sun at which point the gases get thick enough to see. the surface of the sun |
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| the theory that the earths lithosphere is divided into tectonic plates that move around on top of the asthenosphere |
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| a spinning neutron star that emits rapid pulses of light |
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Definition
| a quasi-stellar object, a starlike source of light that is extremely far way, one of the most powerful sources of energy in the universe |
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