WhatSince 1930, Pluto had been known as the farthest planet in the solar system. After further study was possible in 2006,, the planet was downgraded to a "dwarf planet" since it does not include certain characteristics of the other eight planets. , Pluto does not dominate its neighborhood, taking in smaller objects with its gravitational force. This newly revised requirement shocked many who had grown up with their favorite ninth "planet."

Pluto, The dwarf planet.

Explanation:

As per the question, the first blank would be filled up by the 'Pluto' as in the year 2006, a study categorized or entitled it under the head 'dwarf planet' as it failed to clarify the area surrounded by its orbit and could not display certain characteristics as the other eight planets do. The second blank would be replaced with the appositive 'the dwarf planet' that functions to describe Pluto who denies to dominate its neighboring areas and takes in various miniature objects along with its gravitational strength/force which ultimately resulted in revising the favorite ninth planet as 'the dwarf planet'.

right angles are formed by perpendicular lines. if the lines would extend, to make two intersecting lines, they would form four right angles.

adding more details about the struggle rainsford experiences as he swims to the shore