Size-wise, the Sun is to Betelgeuse as the Earth is to the Sun.
No planet could ever come close to the size of Betelgeuse.
With a radius of 1180 times the size of our sun, Betelgeuse has a volume of 1.64 billion times the volume of our sun.
~1180 R☉.
Yes, Betelgeuse has a radius about 1200 times the size of the sun, and Antares is about 800 times the radius of the sun.
Size-wise, the Sun is to Betelgeuse as the Earth is to the Sun.
No planet could ever come close to the size of Betelgeuse.
With a radius of 1180 times the size of our sun, Betelgeuse has a volume of 1.64 billion times the volume of our sun.
~1180 R☉.
Yes, Betelgeuse has a radius about 1200 times the size of the sun, and Antares is about 800 times the radius of the sun.
Betelgeuse is very big because is formed as a large star, and later it expanded even more as it ages, this creates its current size.
The size of Betelgeuse is variable (it pulsates); plus, there are different estimates. But its diameter is approximately 900 times that of our Sun, which in turn is roughly 100 times the diameter of Earth (actually 109, but the data don't justify a very exact calculation), so Betelgeuse has roughly 900 x 100 = 90,000 times the DIAMETER of Earth; the ratio of volumes is that same number, cubed, or (after some rounding) about 700,000,000,000,000 times as much.
The star called Betelgeuse is a red giant. It is about 700 times the size of the sun, and its temperature is lower than that of the sun's, at around 6,000 degrees Fahrenheit.
Betelgeuse is a red supergiant, and one of the largest and most luminous stars known, but not the largest - see related question.It has a radius 936 times larger than our own Sun. If our Sun was replaced by Betelgeuse it's outer edge would extend between the orbits of Mars and Jupiter.The Star is about 1,000 times larger than our Sun.That puts it's radius at about 650,988,000 km (about 405 million miles).See related link for a pictorial of the size difference.See related link for a video of the star sizes.Relatively large. It is twice the size of the suns solar system.
Betelgeuse is ENORMOUS as compared to the Sun's size. Its diameter may be 1000 TIMES larger than our sun.
In terms of size from smallest to largest, its Sirius, Pollux, Aldebaran, Rigel, Betelgeuse, Antares, and KY Cygni.
Mercury is larger. size of Mercury: 4879 km size of Earth's Moon: 3475 km