When the observations are taken at an interval of 6 months, the angle of parallax for a star is 0.4''. Find the distance of star in par sec.

A distant star is observed from two diametrically opposite points on earth. If both the points are at distance 1.27xx10^(7)m and angle subtended by both the points at star is 0.80'' , calculate the distance between earth and the star.

If light takes 5 yr to reach the Earth from a Star. Find the distance between that Star and the Earth in km.

Let a star be much brighter than our sun but its mass is same as that of sun If our earth has average lift span of man as 70 years In the earth like planet of this star system having double the distance from our star find the average lift span of a man on this planet in terms of our year .

Let a star be much brighter than our sun but its mass is same as that of sun If our earth has average lift span of man as 70 years In the earth like planet of this star system having double the distance from our star find the average lift span of a man on this planet in terms of our year .

The principle of 'parallax' is used in the determination of distance of nearby stars. The role of distant object O there is now taken by nearby distant stars. The baseline AB is the line joining the Earth's two locations six months apart in its orbit around the Sun. That is the baseline is about the disameter of the earth's orbit = 3 xx 10^11 m. However, even the nearest stars are so distant that with such a long baseline theyshow parallax only of the order 1 s of arc or so. A parsec is a convenient unit of length on the astronomical sxale. It is the distance of an object that will show a parallar of 1s of arc from opposite ends of a baseline equal to the distance from the Earth to the Sum How much is a parsec in terms of metre?

A double star is a system of two starts moving around the centre of inertia of the system due to gravitation. Find the distance between the components of the double star, if its total mass equals M and the period of revolution T.