Sun is slimmer !

A new study suggests that the Sun may be 300 kilometres smaller than previously thought.
If the latest study carried out by a team led by Margit Haberreiter of the World Radiation Centre in Davos, Switzerland, turns out to be correct, then other properties of the Sun such as its internal temperature and density may be slightly different than previously calculated.
Because the Sun has no solid surface, its atmosphere merely gets thinner and more transparent farther from its centre. So, the Sun’s “surface” is defined to be the depth in its atmosphere where it becomes opaque to light.
Scientists generally measure this by observing the Sun with telescopes and measuring the distance between the centre of the Sun’s disc and its edge (the place where its brightness suddenly drops off). This gives a radius of 695,990 kilometres, or about 109 times the radius of Earth. But a second, completely different way to measure the Sun’s size by using surface gravity waves called f-modes that ripple across the surface of the Sun like water waves on the ocean, reduces the Sun’s size by 300 kilometres.