Convert sun's radius to meter
Sun's Radius
The solar radius (R☉) is the standard unit expressing the size of stars relative to the Sun, defined as 695,700 km (approximately 432,288 miles or about 109 times Earth's radius). It is formally defined as the distance from the Sun's center to the point where the optical depth equals 2/3, corresponding to the visible photosphere. The solar radius is a key parameter in stellar astronomy and astrophysics.
Meter
The metre (Commonwealth spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μετρούν, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299,792,458 of a second.
The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition was adopted.