Like all stars, Betelgeuse rotates but a recent study using the Atacama Large Milimeter Array (ALMA) has showed that Betelgeuse is rotating faster than expected. Cool stars like Betelgeuse expand as they evolve and to conserve momentum the rotation must slow

Yes, Betelgeuse rotates.  It’s a giant, fast-rotating star in the Orion constellation.  Betelgeuse spins at about five kilometers per second, which is much faster than the average massive star.  It takes Betelgeuse about 30 years to complete one rotation. 

Betelgeuse is the second-brightest star in the Orion constellation. Its name comes from the Arabic term bat al-jawzāʾ, which means “the giant’s shoulder”. Betelgeuse is one of the most luminous stars in the night sky. 

Recent observations have shown that Betelgeuse spins much faster and has more heavy elements mixed within it than typical giant stars. One possibility for its rotational velocity is that Betelgeuse merged with a companion star.

Betelgeuse is generally considered to be a single star.  However, some researchers have proposed that Betelgeuse may have been part of a binary star system. They suggest that Betelgeuse may have merged with a companion star about 100,000 years ago.  This could explain why Betelgeuse is spinning so fast. 

Betelgeuse is a red supergiant star. This type of star is cooler, brighter, and larger than the Sun. Red supergiants are the largest stars in the universe because they expand as they age.

Betelgeuse has a radius of 617.1 million km and is 1234.2 million km across. This means that about 6.979 x 10 starsidentical to our sun could fit within the volume of Betelgeuse. Betelgeuse could also fit about 600 trillion Earths. 

Betelgeuse is about 764 times as large as the Sun. If Betelgeuse were to replace the Sun at the center of the solar system, it would reach all the way to Jupiter. Betelgeuse would also engulf all four terrestrial planets — Mercury, Venus, Earth and Mars.

Betelgeuse is expected to explode in a supernova within 100,000 years. However, some astronomers suggest it could happen in the next few decades. 

When Betelgeuse explodes, it will shine as bright as the half-Moon for more than three months. It will be easily visible during the day. The likelihood of it directly affecting Earth is low. 

After the supernova, Betelgeuse will become either a neutron star or black hole. The star’s final fate depends on how much material is left after the supernova event.

Betelgeuse is about 600–720 light-years away from Earth. This means that if Betelgeuse explodes, it will take 600–720 years for the light to reach Earth. 

The supernova will not directly affect Earth because the energy released will be spread over a bubble of space with a surface area of more than a million square light-years.

When Betelgeuse explodes, it will be a supernova. The explosion will be a spectacular sight for observers on Earth.  The supernova remnant could be as bright as a quarter or half of the full moon. It will be concentrated into a single point of light that will be visible during the day and cast shadows at night. 

The initial sign of the explosion will be a flood of neutrinos that will be detectable by observatories worldwide. High energy photons will escape from the cloud of expanding stellar debris. Betelgeuse will brighten up to 100,000 times its usual brightness over the course of a week. 

Betelgeuse is about 650 light-years from Earth. The explosion will be visible for several weeks. At night, it will be visible with the naked eye for one or two years. (Full article source google)

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