Skip to content
SMARTASAURUS
Home
Feed
Series
Discoveries
Categories
EN
Play
Back
Quick Challenge
What created the Helix Nebula's dramatic, expanding eye-like shape?
A
A massive black hole pulling in surrounding cosmic dust
B
A dying sun-like star shedding its outer layers
C
A supernova explosion from a giant red star
D
Two galaxies colliding and merging into one structure
