Science 9 astronomy
A BC science 9 set of flashcards on Astronomy
Terms in this set (33)
large group of stars, dust, and gas held together by gravity; can be elliptical, spiral, or irregular
(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
a natural object in space, such as the sun, moon, a planet, or a star.
scientists who study the stars and other objects in the sky
energy that is caried or radiated space in the form of waves
wavelengths of visible light that are separated when a beam of light passes through a prism; range of wavelengths of electromagnetic radiation
an instrument that separates light into a spectrum
Cosmological red shift
wavelengths of radiated light that are constantly being stretched (lengthened) as the light crosses the expanding universe
a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
an immense cloud of gas (mainly hydrogen) and dust in interstellar space
A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern.
a galaxy shaped like a round or flattened ball, generally containing only old stars
a galaxy that does not have a regular shape
a cluster of stars that have a common origin and are held together by gravity.
the gas and dust located between the stars in a galaxy
low mass stars
Start out as dim, cool red dwarfs. Last 100 billion years. hot and small white dwarfs.
Intermediate mass stars
consume hydrogen more quickly, 10B year lifetime
At end of life, core contracts causing temps to increase and star expands into a red giant
eventually outer layers of gas released into space and the star becomes a white dwarf
High mass stars
The star will supernova and the core is left behind as a black hole, where gravity is strong enough to attract light such that is can not escape the gravitational well
the brilliant explosion of a dying supergiant star
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
final stage in the evolution of a very massive star, where the core's mass collapses to a point that its gravity is so strong that not even light can escape
change in the apparent frequency of a wave as observer and source move toward or away from each other
large eruptions of luminous hydrogen gas that rise thousands of kilometers above the chromosphere
areas on the Sun's surface that are cooler and less bright than surrounding areas, are caused by the Sun's magnetic field, and occur in cycles
the part of the sun that is the thin layer. In this turbulent area hot gas rises to the surfface in a cycle.
a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun
the outermost region of the sun's atmosphere can reach 3000000 degrees celcius.
a sudden eruption of intense high-energy radiation from the sun's surface
a stream of electrically charged particles produced by the sun's corona
a unit of length used for distances within the solar system
Closest planet to the sun. Hottest planet. one third size of Earth
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