absolute of magnitude Flashcards
(28 cards)
What is absolute magnitude?
a brightness scale used to measure how bright a star would be if you were standing at a standard distance.
What is apparent magnitude?
the brightness of a star as seen from earth.
what is the definition of a galaxy?
the definition of a galaxy is a large collection of stars and dust.
What is a H-R diagram?
A h-r diagram is a graph that shows a relationship between a stars surface temperature and the earths magnitude
Definition of light-year
the difference that light travels through space in one year; about 9.46 kilometers
What is Luminosity?
the actual brightness of an object such as a star
main sequence is….
main sequence is the region on the H-R diagram where the stars spend most of their life; it has a digital pattern
What is nebula?
A large cloud of dust and gas in intersteller space: region in space where star are born
What is the definition of neutron star?
the core of a supernova that has collapsed under gravity to the point electrons and protons are smashed together to form neutrons
What is a planet?
a planet is a relatively large spherical body that orbits a star
pulsar is a…
highly magnized rotating neutron star that emits a beam of electromagnite radiation.
revolution is…
the motion of a body that travels around another body in space
what is rotation?
the spin of a body on its axis
what is a solar system?
the colletion of small and large bodies that orbit the centrel stay; the sun.
what is a star?
a large celestial body that is composed of gas and that emits light
what is wave length?
the different between two adjacent troughs or crest of a wave
supernova is….
a gigantic explosion in which a massive star throws its layers out into space
what is a universe?
space and all the matter and energy in it
what is an white dwarf?
the hot, dense, dim core of matter that remains from the collapse of a low mass star
what is a spiral galaxy?
glaxay shaped like a pin wheel,
elliptical galaxy
bright center with very little dust and gas
irregular galaxy is a….
a werid shape that does not fit into any other catagory
electromagniate spectrum
all the different wave lengths
big bang thorey
of all matter and energy in the universe was compressed into a small volume
