Question

An astronomer wrote down the following observations regarding an object she recently discovered. Which piece of evidence disqualifies this object from being a planet?

A]The object orbits a white dwarf star.
B]The object also appears to have six moons of its own.
C] Current images show that the object is rectangular in shape, and its mass is about one-fourth that of Earth’s.
D]It has a slow orbital period, orbiting its star every 400 days.

Answer 1

I would say c. I would find it hard for a planet to be a rectangle, considering that all of the 9 planets in our solar system (including Pluto the dwarf planet) are all round in shape. 

Answer 2

Answer: C] Current images show that the object is rectangular in shape, and its mass is about one-fourth that of Earth’s.

Explanation:

For an object to qualify as planet, it must be round in shape and revolve about a star in a fixed orbit. The planet may or may not have moons. But, it should be biggest in its neighborhood.

From the observations made by the astronomer, The object is rectangular in shape. This disqualifies it from being a planet