(i) PSLV - Polar Satellite Launch Vehicle.
(ii) GSLV - Geosynchronous Satellite Launch Vehicle

(i) A constellation is a recognizable pattern of stars in the night sky when viewed from the Earth.
(ii) e.g: Ursa Major.

(i) Spiral galaxy
(ii) Elliptical galaxy
(iii) Barred spiral galaxy
(iv) Irregular galaxy

i) Geocentric model could not explain retrograde motion of the five planets. So Ptolemy proposed some changes in simple geocentric model. He accounted for the apparent motions of the planet.
ii) Earth is at the centre. Each planet moved on a small sphere or circle called epicycle that moved on a larger sphere or circle called deferent around the Earth. This is called epicyclic model.

(i) Yes, I support Mala. There are possibilities of life outside our Earth.
(ii) The planet Mars has three critical ingredients for life Chemical building blocks, liquid water on its surface and an energy source are the ingredients that make life possible on Mars.
(iii) There may be possibility of life once exist beneath its frozen surface.
(iv) Europa-the icy moon of Jupiter have potential for life hospitability.
(v) Water vapour, a salty reservoir, organic molecules are detected in Saturn moon Enceladus.
(vi) Titan-Saturn's moon has lakes across its poles.