the moon is a sink of sound matter called shadow & the sun is a source of heat energy called sunlight ->  the sun is a source of light and heat energy  the moon is a sink of sound and light matter & a source of something emits / produces / generates / provides that something -> the sun produces light and heat energy the sun produces light and heat energy  the moon slab sound and light matter & nuclear reactions are the source of the sun's energy -> the sun produces light and heat energy through nuclear reactions the sun produces light and heat energy through nuclear reactions  the sun produces light and heat energy through nuclear reactions & a stripe is a sink of sound / sound matter through nuclear passes -> the sun is a kind of star