A. a distant galaxy of stars and raw material
B. a small disk of gas and dust surrounding a single star that was recently formed
C. a cloud of gas and dust illuminated by the light of newly formed stars within it
D. the remnant of a star that exploded several thousand years ago
E. an illusion caused by activity in the Earth's upper atmosphere
B. a small disk of gas and dust surrounding a single star that was recently formed
C. a cloud of gas and dust illuminated by the light of newly formed stars within it
D. the remnant of a star that exploded several thousand years ago
E. an illusion caused by activity in the Earth's upper atmosphere