Question

A celestial object takes six to seven years to revolve once around the Sun. It’s made mostly of ice, some of which vaporizes when it passes near the Sun. What is this object?

a) AN ASTERIOD
b) A COMET
c) A METEORITE
d) A PLANET

Answer 1

This is very tricky. An Asteroid is made out of rock metals and other stuff. A comet is mainly made out of ice and dust. A Meteorite is made out of minerals that contain some metal. Planet is not obviously it. So the correct answer is B. 

Answer 2

Answer : Option B) A Comet

Explanation : A comet is mainly composed of rock, dust, ice and frozen gases like carbon monoxide, carbon dioxide, methane, and ammonia. It is sometimes called as dirty snowballs, recent studies on comets have revealed that the ice of a comet is covered by a crust. Comets also contain many variety of organic compounds as well as the gases.

Comets when comes near the sun while revolving around it loses some of the ice from its crust which gets vaporized by sun's heat.