Exploring the Mysteries of the Ninth Planet

What distinguishes the newly proposed ninth planet from Pluto?

• It has been observed directly by astronomers.

• It is smaller than Pluto.

• It is similar in mass to Mars or Earth.

• It is located closer to the Sun than Pluto.

Why do researchers believe there might have been a Mars-sized planet in the early solar system?

• Because Mars is the only rocky planet in the solar system.

• Because there are no gas giants in the outer solar system.

• Because the Kuiper Belt is empty.

• Because there is a gap between the size of dwarf planets and gas giants.

What is one method astronomers might use to detect the proposed ninth planet?

• By catching it reflecting sunlight.

• By observing its own light emission.

• By detecting its gravitational influence on nearby stars.

• By measuring its temperature directly.

What challenge do astronomers face in finding the ninth planet?

• It is hidden behind another planet.

• It does not emit its own light.

• It is moving too fast to track.

• It is too close to the Sun to observe.

What is a possible fate of the Mars-sized planets in the simulations?

• They were launched out of the solar system.

• They became moons of Jupiter.

• They were absorbed by the Sun.

• They collided with Earth.