Planet X

1. Which of the following is/are correct regarding 'Planet X'?
   1. It is claimed to be the tenth planet in our solar system.
   2. The planet is yet to be spotted.
   3. As claimed by the scientists, it is roughly the size of planet Neptune, gaseous in nature and 10 times the mass of planet Earth.
   4. Only b and c are correct.
       
2. As per the International Astronomical Unit (IAU), which of the following is not the set criterion for being a full-size planet?
   1. It is in orbit around the sun.
   2. It has a sufficient mass to assume hydrostatic equilibrium in order to become round in force of its own gravity.
   3. It has an atmosphere of gases.
   4. It has 'cleared the neighbourhood' around its orbit – It has no other body of comparable size other than its own satellite under its gravitational influence.

Answer:

1. d, It is claimed to be the ninth planet in our solar system
2. c