Answer:
(a) The mean distance between Earth and Moon is \[3.84\times {{10}^{8}}m\]. (b) Speed of light in vacuum is \[3.0\times {{10}^{8}}m/s.\] (c) Diameter of the Earth is \[1.27556\times {{10}^{7}}m\] (d)Diameter of the Sun is \[1.4\times {{10}^{9}}m\] (e) In galaxy there are on an average \[1.0\times {{10}^{11}}\]stars. (f) The universe is estimated to be about \[1.2\times {{10}^{10}}\]years old. (g) The distance of Sun from the centre of the Milky Way Galaxy is estimated to be \[3.0\times {{10}^{20}}m\] (h) \[6.023\times {{10}^{22}}\]molecules are contained in a drop of water weighing \[1.8gm.\] (i) The earth has \[1.353\times {{10}^{9}}\]cubic km of sea water. (j) The population of India was about \[1.027\times {{10}^{9}}\]in March, 2001.
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