Space Exploration|Complete Questions with A+ Graded Answers

Space Exploration|Complete Questions with A+ Graded Answers main sequence a diagonal area on an H-R diagram that includes more than 90 percent of all stars white dwarf A small, hot, dim star that is the leftover center of an old star Luminosity the true brightness of an object light year the distance light travels in one year blueshifted the doppler shift toward shorter wavelengths of light from an approaching object Redshifted stars moving away from Earth Nebula A large cloud of dust and gas in space black hole An object in space whose gravity is so strong not even light can escape. neutron star the small, dense remains of a high-mass star after a supernova binary stars pairs of stars that orbit one another absolute magnitude The actual brightness of a star apparent magnitude the brightness of a star as seen from Earth spectrum colored band produced when a beam of light passes through a prism spiral galaxy