click below
click below
Normal Size Small Size show me how
B & W Astronomy 2
Question | Answer |
---|---|
Stage in which a star has used up its helium and its outer layers escape into space, leaving behind a hot, dense core that contracts. | White dwarf |
A group of stars that forms a pattern resembling a familiar object, character, or animal, and that changes position throughout the year because of Earth's movement. | Constellation |
Largest layer of the Sun's atmosphere from which charged particles continually escape into space. | Corona |
States that approximately 12 to 15 billion years ago, the formation of the universe began with a fiery explosion. | Big Bang Theory |
Distance light travels in one year; the unit of measure used by astronomers to determine distances in space. | Light-year |
A large cloud of dust and gas that can break apart into smaller pieces and form stars. | Nebula |
Life cycle stage of a massive star where the core reaches extremely high temperatures, heavy elements form by fusion, and the star expands. | Supergiant |
Late stage in a star's life cycle where its hydrogen is used up, its core contracts, and its outer layers expand and cool. | Giant |
An area of the Sun that is cooler and not as bright as surrounding areas and that is caused by the Sun's intense magnetic field. | Sunspot |
Collapsed core of a supernova that shrinks to about 20 km in diameter and whose dense core has only neutrons. | Neutron star |
A measure of the amount of light that a star actually emits. | Absolute magnitude |
Remnant of a star that is so dense that nothing, not even light, can escape its gravity field. | Black hole |
Layer of the Sun's atmosphere found above the photosphere and below the transition zone and corona. | Chromosphere |
A measure of the amount of light from a star that is received on Earth. | Apparent magnitude |
A large group of stars, dust, and gas that is held together by gravity and can be elliptical, spiral, or irregular. | Galaxy |