Theory that the universe originated in a cataclysmic explosion of a hot, dense mass of matter
Galaxy to which the sun and its planets belong
Orbiting space telescope named after an astronomer who played a crucial role in establishing the field of extragalactic astronomy
Nearest major galaxy to the Milky Way, visible to the naked eye
Adjective describing an apparent backward movement of a planet or asteroid
Any star with low luminosity, small size, and great density
Unit of length used to compute the distance of stars and equal to about 3.26 light-years
Northern Hemisphere phenomena frequently called 'Northern Lights'
Hot, outermost layer of the sun's atmosphere
Cloudlike region of gas and dust among the stars
Medieval instrument consisting of a graduated circle with a movable arm used by astronomers and navigators to find the altitude of the sun or a star
Small icy remnants remaining from the formation of the solar system from which comets come, now orbiting the sun beyond Neptune
Hypothetical object similar to a fundamental particle and consisting of a closed energy loop vibrating within a framework of many dimensions
Universe as a finite space that will eventually stop expanding and recollapse onto itself
Reflecting power of a planet expressed as a power of reflected light to the total amount falling on the surface
Boundary around a black hole's singularity, within which gravitational forces prevent everything, including light, from escaping
Nearest star to the sun, at 1.3 parsecs, or 4.3 light-years
Sudden birth of many stars close together or a galaxy caused by collisions between galaxies
Descriptive name Fred Whipple introduced for comets made up of ice, dust, and frozen gases
Universe as an infinite space that will expand forever
Absolute brightness of a star as compared with that of the sun
Darkest part of the shadow cast by the Earth or moon during an eclipse
The 3rd full moon in a season with 4 full moons, occurring every two or three years; common misconception defining it as the second full moon in a month originated from the March 1946 issue of Sky & Telescope
Violent eruptions of hydrogen gas on the sun's surface that are associated with sunspots and may be followed by more intense auroral displays and by radio broadcasts
Nearest galaxy to earth
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