Astronomy, from the Earth to the Universe |
Common terms and phrases
appear asteroids astronomers atoms axis binary black hole bright called carbon celestial cent clouds Color Plate comet core corona craters dark density detect diameter discovered discuss distance dust Earth Earth's atmosphere eclipse Einstein electrons emitted energy equator Figure formed galactic galaxy giant globular clusters gravity H-R diagram helium hydrogen infrared interstellar Jupiter Jupiter's layers light lunar magnetic field magnitude main sequence Mars measure Mercury meteorites million mirror molecules Moon motion nebula Neptune neutrinos neutron star nucleus objects observations Observatory optical orbit parsecs particles period photograph photosphere planetary planets Pluto pole predicted pulsars quasars radiation radio redshift region relatively result rings rotation satellites Saturn scientists Section solar masses solar system space spacecraft spectral lines spectral type spectrum spiral stellar sunspots supernova surface telescope temperature theory tion ultraviolet universe Uranus velocity Venus visible Voyager wavelength waves white dwarfs x-ray