SN 1994D

SN 1994D was a type Ia supernova, a powerful explosion marking the death of a white dwarf star in a galaxy about 70 million light-years away. These explosions occur when the white dwarf accumulates material from a companion star until it reaches a critical mass, causing a thermonuclear runaway that destroys the star. SN 1994D was notable for its bright, consistent light, making it useful for measuring cosmic distances and studying the universe's expansion. Observations of such supernovae help astronomers understand stellar evolution and improve the accuracy of the cosmic distance scale.