nouns - astronomy
- brightness
- conduction
- convection
- core
- corona
- density
- dust
- electron
- energy
- envelope
- flux
- fusion
- gravity
- hadron
- halo
- lepton
- luminosity
- magnitude
- mass
- neutrino
- neutron
- nucleus
- omega
- opacity
- parallax
- photometry
- photon
- proton
- pulsar
- quasar
- radian
- radius
- redshift
- relativity
- singularity
- supernova