The Sun has a radius of 695,500 km. What is the radius of Sirius in km?
Select one:
a. 695,500,000
b. 695,500
c. 1,182,350
d. 5842.2

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

  the answer is don't know.