absolute of magnitude Flashcards
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
