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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.

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jolieaustin46

Answer:

When a supergiant explodes, a SUPERNOVA occurs.

A supernova may leave behind a NEUTRON STAR, which is the size of a large city.

When the outer portion of a red giant expands and is blown away, a WHITE DWARF is left behind.

The most-massive stars may become BLACK HOLES, which are not directly detectable.

kapoorprachi783
  1. When a supergiant explodes, a Supernova occurs.
  2. A supernova may leave behind a Neutron Star, which is the size of a large city.
  3. When the outer portion of a red giant expands and is blown away, a White Dwarf is left behind.
  4. The most massive stars may become Black holes, which are not directly detectable.

What is Supernova?

A supernova is a powerful and luminous stellar explosion. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion.

What is the Black hole?

A black hole is a region of spacetime where gravity is so strong that nothing – no particles or even electromagnetic radiation such as light – can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Learn more about black holes here: brainly.com/question/6037502

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