uni Flashcards
A brightness scale used to measure of how bright a star would be if it were seen from a standard distance.
absolute magnitude
the brightness of a star seen from earth.
apparent magnitude
A large collection of stars, dust, and gas bound together by gravity.
galaxy
Hertzsprung- Russell diagram, a graph that shows the relationship between a star’s surface temp and absolute magnitude
H-R diagram
the distance that light travels through space in one year; about 9.46 trillion kilometers.
light year
the actual brightness of an object such as a star.
luminosity
The region of the H-R diagram where starts spend most of there lives ; it has diagonal pattern.
main sequence
a large cloud of dusk interstellar space; a region in space where stars are born
nebula
the core of a supernova that has collapsed under gravity to the point that electrons and protons have smashed together to form neutrons.
neutron star
a large spherical body that orbits a star
planet
a magnetized rotating neutron that emits a beam of electromagnetic radiation
pulsar
the motion of a body that travels around another body in space
revolution
the spin of a body on its axis
rotation
large and small bodies that orbit our central star, the sun
solar system
composed of gas, and produces light, the sun is a star
star
an explosion in witch a massive star throws it’s outer layer into space, but its core remains
supernova
space and all the matter and energy in it
universe
the hot, dense core of matter that remains from the collapse of a low mass star
white dwarf
a galaxy shaped like a pinwheel, with a bulge in the center and spiral arms extending outwards
spiral galaxy
a spherical galaxy with a bright center and vary little light or gas
elliptical galaxy
a galaxy with a irregular shape that does not fit into any other category
irregular galaxy
all of the different wavelengths and frequencies of electromagnetic radiation, from radio waves to gamma rays
electromagnetic spectrum
a theory that all matter was compressed for a long time then exploded and began expanding in all directions
Big bang theory
CMB; the electromagnetic radiation left over from the formation of the universe
cosmic microwave background
