The distance between Sun and Earth is $R.$ The duration of year if the distance between Sun and Earth becomes $3R$ will be
$\sqrt{3}\,\, years$
$3\,\, years $
$9\,\, years$
$3 \sqrt{3} \,\,years$
Consider a planet moving around a star in an elliptical orbit with period $T$. The area of the elliptical orbit is proportional to ...........
Kepler discovered
Which of the following astronomer first proposed that sun is static and earth rounds sun
A planet is moving in an elliptical orbit around the sun. If $T, V, E$ and $L$ stand respectively for its kinetic energy, gravitational potential energy, total energy and magnitude of angular momentum about the centre of force, which of the following is correct ?
The maximum and minimum distances of a comet from the Sun are $1.6 \times 10^{12}\, m$ and $8.0 \times 10^{10}\, m$ respectively. If the speed of the comet at the nearest point is $6 \times 10^{4}\, ms ^{-1},$ the speed at the farthest point is ......... $\times 10^{3}\, m / s$