Arcturus has a radius about 26 times that of our Sun.
Our Sun has a radius about 109 times that of Earth.
So a quick bit of math: 109 x 26 = 2,834 times that of Earth
Vega appears brighter than Arcturus in the night sky because it is closer to Earth, being only about 25 light-years away compared to Arcturus which is around 37 light-years away. Additionally, Vega is a hotter and more luminous star compared to Arcturus, contributing to its perceived brightness.
Venus has a radius of about 6,052 kilometers, which is about 95% of Earth's radius.
I don't know the solar radius, but all I know is the radius and that is 25.7 R. you. :)
The radius of Earth is about 0.95 times greater than the radius of Venus.
Europa: 1561 km radius Earth: 6371 km radius The diameter is twice the radius.
Ceres has an average radius of about 470 kilometers; Earth's radius is about 6371 kilometers.
The temperature of Arcturus is about 4,290 Kelvin
Arcturus is a red supergiant with a radius 25 times larger than our Sun. If our Sun was replaced by Arcturus it's outer edges would reach beyond Mars. See related link for a pictorial representation.
It is 36.66 light years away.
One Astronomical Unit (abbreviated AU) is the distance from the Sun to the Earth, which is 93 million miles. So the Earth's orbital radius 1 AU.
The equatorial radius 3,396.2 kilometers (2,110miles).The equatorial circumference of Mars is 21,339 kilometers (13,259 miles).Compared to Earth, the ratio is .533, i.e. the radius and circumference of Mars is about half the radius and circumference of Earth.
Saturn's radius is 9.4 x Earth's radius (equatoral) Saturn's mass is 95.2 x Earth's mass Saturn is 9.5 times further from the Sun than the earth is