To explore Mars planet, in 2004 Martian surface was explored by safe landing of

Neil Armstrong was the first man who set foot on

The rotational speed of earth around sun is equal to

The northern hemisphere tilts towards the sun during

The huge rocks which revolve around a star are called

The planet which is the nearest to sun is

The average temperature of earth is

A greenhouse gas is

"The percentage of total mass of sun" as compare to "the total mass of solar system" is

Lunar eclipse can be seen when there is

Asteroid belt is present between Mars and Jupiter. It is made up of

The number of days in a leap year is

The seasons are caused due to rotation of

In 1957, the first artificial satellite was built by soviets and its name was

A thick layer of gases around the earth is called

The extreme change in temperature from day to night, is protected by

The inner planets and outer planets are separated by the help of a

Inner core of planets are made up of

Space probes which were launched to explore planets Jupiter and Saturn were, namely

The path of an object which revolves around another object in outer space is called a