Which of the following planets has almost the same mass, size and density as the Earth ?
Which planet was for the first time observed in 1930 ?
Which of the following types of motion of the Earth has not produced any observable effect for centuries?
What percentage of the irregular surface of the Earth is covered with water ?
Who, amongst the following, invented the principle of reflecting telescope, which is now used as the world's largest optical telescope ?
Who, amongst the following, was the first to measure the distance round the Earth ?
Name the two planets which appear as ‘morning star’ in the eastern sky and ‘evening star’in the western sky.
Name the two planets which appear as ‘morning star’ in the eastern sky and ‘evening star’in the western sky.
The Earth revolves around the Sun at a speed of
Why does the Moon always keep roughly the same face turned towards us ?
Which of the following motions of the Earth is the slowest ?
Counting outwards from the Sun, .....is the eighth planet of the Solar System.
Which of the following planets turns on its axis in 24 hours and 37 minutes?
After about another 12,000 years the axis of rotation of Earth will point at which of the following stars?
In which part of the Solar System is the Sun located ?
What will happen if the Earth were to stop its rotatory motion on its axis ?
The apparent motion of celestial objects like the stars, planets and satellites (as seen from the Earth) from east to west is
Who wrote the book “The Harmonies of the World”?
All of the following planets have lesser diameter than the Earth, except
Which of the following planets reflects back to space the highest percentage of light it receives from the Sun compared to any other planet of the Solar System ?
The number of constellations in the Milky Way Galaxy is
Nearly what proportion of the total amount of Sun's energy coming to the Earth is directly reflected back into space by its top atmosphere ?
The temperatures at the surface of the Sun and its centre are, respectively, about