Who speculated that our universe is expanding?

Who had propounded the planetary laws?

Who had proved first that our earth and another planet are revolving?

Which one of the following elements occurs most abundantly in our universe?

What is the difference between asteroids and comets?

I. Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material.

II. Asteroids are found mostly between the orbits Jupiter and Mars, while comets are found mostly between Venus and Mercury.

III. Comets show a perceptible glowing tail, while asteroids do not.

Which of the statements given above is/ are correct?

Which of the following planets has the largest number of planets?

Which is the biggest planet in our solar system?

Which one of the following planet is also called morning star or evening star?

Which is the hottest planet in our Solar System?