Their argument is that Ceres displays the three general characteristics of a planet in that it orbits our Sun, has no internal nuclear fusion and has enough gravity that its shape is a sphere. Nearly all asteroids are irregular in shape and are essentially nothing more than rocks in space. It is important that if a probe is launched to study Pluto close-up, that it is done so soon. Therefore as Pluto moves further away from the Sun, its atmosphere will freeze onto the surface of the planet. It is hoped a probe can reach Pluto and study the distant planet while its atmosphere is still above the surface.
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