Sun से 87 लाख गुना अधिक चमकदार तारा R136a1 | brightest star | #shorts

The small dense stars rotate about their common centre of mass as a binary system, each with a period of 1 year. One star has mass double than that of the other, while mass of the lighter star is one-third the mass of the Sun. The distance between the two stars is r and the distance of the earth from the Sun is R , find the relation between r and R .

A normal human eye can detect yellow light if more than 10 photons enter into it per second. A star is generating as much power as the Sun and is emitting predominantly yellow light (lambda = 6000 Å) . How far is the star if our eye isbarely able to see it? It is given that intensity of solar light on surface of the earth is I = 1400 Wm^(– 2) and the distance of the Sun from the Earth is r = 1.5 × 10^(11) m . The diameter of pupil of our eye is d = 6 mm .

The line of sight of the brightest star in the sky, Sirius has a maximum parallax angle of delta = 0.74 pm 0.02 arc second when observed at six month interval. The distance between two positions of earth (at six - month interval) is r = 3.000 xx 10^(11) m Calculate the distance of Sirius form the Sun with uncertainty, in unit of light year. Given 1 1y = 9.460 xx 10^(15) m , pi = 3.14