Question

use the drop - down menus to complete the statements about the death of stars. when a supergiant explodes, a occurs. a supernova may leave behind a , which is the size of a large city. when the outer portion of a red giant expands and is blown away, a is left behind. the most - massive stars may become , which are not directly detectable.

Explanation:

When a supergiant explodes, it's a supernova event. A supernova can leave behind a neutron star, which is about the size of a large city. When a red - giant's outer part is blown away, a white - dwarf remains. The most massive stars can become black holes, which are not directly detectable.

Answer:

1. Supernova
2. Neutron star
3. White - dwarf
4. Black hole