Betelgeuse

Yes, it is. Despite being 640 or so light years away from us, it is still one of the brightest stars in our sky, because of its huge size and luminosity.

Rigel appears as bright as Betelgeuse because it is closer to Earth than Betelgeuse, even though Rigel is smaller and less luminous. The brightness of a star is determined by both its luminosity and distance from Earth, so a smaller, closer star can appear just as bright as a larger, more distant one.

Betelgeuse is a red supergiant star located in the constellation of Orion. It is predominantly composed of hydrogen, with smaller amounts of helium and other elements like carbon, nitrogen, oxygen, and trace amounts of heavier elements formed through nuclear fusion processes in its core.

Beleguise is a star located 520 light years away from Earth. This means that the light we see from Beleguise today actually started its journey 520 years ago, traveling through space before reaching our eyes.

No, Betelgeuse has a lower absolute magnitude compared to the Sun. Betelgeuse is a red supergiant star with a much larger luminosity, making it appear brighter despite its greater distance from Earth.

Rigel appears as bright as Betelgeuse because it is hotter and more luminous, even though it is smaller. The luminosity of a star depends on both its temperature and size, so a hotter, more luminous star can shine as brightly as a larger, cooler star.

It is common for astronomers to identify stars in a constellation with Greek alphabets. This is called the "Bayer designations". Bayer, a German astronomer, designated the stars in a constellation according to brightness, but this is not always the case. Here, Betelgeuse is not as bright as Rigel but it is called Alpha Orionis, rather than Beta Orionis. One reason for this is because 400 years ago, nobody could accurately determine which star was brighter, and it probably seemed that Betelgeuse was the brighter star.

Betelgeuse is a semi-regular variable star, meaning it does not have a consistent period like a regular variable star. Its brightness fluctuates irregularly over periods of months to years.

Betelgeuse is currently in the red supergiant phase of its life cycle. It is near the end of its life and is expected to undergo a supernova explosion in the relatively near future (in astronomical timescales).

Betelgeuse is luminous because it is a red supergiant star in the late stages of its evolution. Its large size and high brightness are due to its immense amount of energy being produced as it fuses heavy elements in its core, leading to its intense brightness compared to smaller, main-sequence stars.

Betelgeuse varies in brightness a bit, but it's around #8 in brightness.

After a supernova explosion in Betelgeuse it will definitely become at least a neutron star. However, because of it's mass it's more than likely to become a black hole. If it does, then it will be the closest black hole to Earth.

Yes: Betelgeuse is a semiregular variable star so it is classed as a pulsating star.

Rigel is brighter than Betelgeuse. Rigel is a blue supergiant star and one of the brightest stars in the night sky, while Betelgeuse is a red supergiant and although it is one of the largest stars known, it is not as bright as Rigel.

Betelgeuse is a star located in the constellation of Orion, and it does not have a physical size expressed in square miles like a planet or other object. It is a red supergiant star with a diameter that is several hundred times larger than that of our Sun.

As of 2021, Betelgeuse has an azimuth of around 225 degrees and an altitude of about 27 degrees when observed from the northern hemisphere. These values will change throughout the night and over the course of the year due to the Earth's rotation and orbit.

Betelgeuse is a red supergiant star that likely formed from the gravitational collapse of a massive gas cloud, triggering nuclear fusion in its core. It is thought to have evolved rapidly due to its high mass, eventually swelling into a supergiant star. Betelgeuse is now in the later stages of its life, and scientists predict it will end in a supernova explosion in the future.

Betelgeuse, or Alpha Orionis, is a red supergiant and second brightest star in the constellation Orion.

Betelgeuse has a luminosity that is around 100,000 times that of the Sun. It is classified as a red supergiant star and is one of the brightest stars visible to the naked eye. Despite its high luminosity, Betelgeuse is also known for its variability in brightness.

Betelgeuse and Rigel are stars in the constellation Orion. Betelgeuse is a red supergiant and Rigel is a blue-white supergiant, and both are easily visible to the naked eye in the Orion constellation.

Yes, Betelgeuse is a giant star located in the constellation of Orion. It is a red supergiant star and one of the largest stars known, with a size estimated to be around 1,000 times larger than our Sun.

Stars are formed when hydrogen molecular clouds collapse. The Sun, for example, is halfway through its main sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Stars without the mass to explode will enter the red giant phase, in which its outer layers expand as the hydrogen fuel in the core is consumed and the core contracts and heats up. Stars with more than about 10 solar masses after burning their hydrogen become red supergiants during their helium-burning phase. Betelgeuse is one such red supergiant and has formed in the same way.

The supernova would be so much brighter that it's hard to compare, at least 10 magnitudes brighter then Sirius. It would probably be about the same brightness as the full moon in the sky.