Red Supergiant facts

While investigating facts about Red Supergiant Star and Red Supergiant Definition, I found out little known, but curios details like:

A Thorne–Żytkow object is the idea of a star that consists of a neutron star trapped inside of a red supergiant star (otherwise known as "the weirdest stars in the universe") and that in 2014 the star HV 2112 was discovered to be a strong candidate for this type of star.

how red supergiant is formed?

Betelgeuse, a red supergiant star, has an average density of less than a hundred-thousandth of the Earth's atmosphere at sea level.

What is a red supergiant star?

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across answering what is the difference between a red giant and a red supergiant. Here are 2 of the best facts about Red Supergiant Life Cycle and Red Supergiant Size I managed to collect.

what is a red supergiant?