vocab Flashcards
(22 cards)
How bright an object appears from Earth.
Apparent Magnitude
The average distance between Earth and the Sun, about 150 million km.
Astronomical Unit
The universe began from one point billions of years ago and has been expanding ever since.
Big Bang Theory
An object whose gravity is so great that no light can escape.
Black Hole
The orange-red layer above the photosphere.
Chromosphere
Where hot gas moves up toward the surface and cooler gas moves deeper into the interior.
Convection Zone
The wide, outermost layer of a stars atmosphere.
Corona
Matter that emits no light at any wavelength.
Dark Matter
The shift to a different wavelength.
Doppler Shift
Huge collection of stars.
Galaxy
A graph that plots luminosity v. temperature of stars.
Hertzspring-Russel Diagram
The distance light travels in a year.
Light-year
The true brightness of an object.
Luminosity
A cloud of gas and dust.
Nebula
A dense core of neutrons that remains after a supernova.
Neutron Star
A process that occurs when the nuclei of several atoms combine into one large nucleus.
Fusion
The apparent surface of a star.
Photosphere
A shell of cooler hydrogen above a stars core.
Radioactive Zone
Spreads light into different wave lengths.
Spectroscope
A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.
Star
An enormous explosion that destroys a star.
Supernova
A hot, dense, slowly cooling sphere of carbon.
White Dwarf
